An Aluminosilicate Zeolite Containing Rings of Tetrahedral Atoms with All Odd Numbers from Five to Eleven

Article abstract of DOI:10.1002/anie.202015483

Herein we report the synthesis, structure solution, and catalytic properties of PST-31, which has an unprecedented framework topology. This high-silica (Si/Al=16) zeolite was synthesized using a pyrazolium-based dication with a tetramethylene linker as an organic structure-directing agent (OSDA) in hydroxide media. The PST-31 structure is built from new building layers containing four-, five-, six-, and seven-membered rings, which are connected by single four-membered rings in the interlayer region to form a two-dimensional pore system. Its channels consist of [4.5⁶.6.9.11] and [5.6.7.9.10.11] cavities and are thus delimited by nine-, ten-, and eleven-membered rings. The OSDA cations in as-synthesized PST-31 were determined to reside without disorder in the large [4².5¹⁴.6⁴.7².9⁴] cavities composed of smaller [4.5⁶.6.9.11] and [5.6.7.9.10.11] ones, leading to a symmetry coincidence between the OSDA and the surrounding zeolite cavity. The proton form of PST-31 was found to be selective for the cracking of n-hexane to light olefins.

Full text of DOI:10.1002/anie.202015483

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Accepted Article
Title: An Aluminosilicate Zeolite Containing Rings of Tetrahedral Atoms
with All Odd Numbers from Five to Eleven
Authors: Donghui Jo, Yaping Zhang, Jeong Hwan Lee, Alvaro Mayoral,
Jiho Shin, Na Young Kang, Yong-Ki Park, and Suk Bong
Hong
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Angewandte Chemie International Edition
10.1002/anie.202015483
RESEARCH ARTICLE
An Aluminosilicate Zeolite Containing Rings of Tetrahedral
Atoms with All Odd Numbers from Five to Eleven
Donghui Jo+,[a,f] Yaping Zhang , Jeong Hwan Lee, Alvaro Mayoral,*
+ [b]
[a]
[b,c,d]
Jiho Shin, Na Young
[e]
[
e]
[e]
[a]
Kang, Yong-Ki Park, and Suk Bong Hong*
[
[
a]
b]
Dr. D. Jo,+ Dr. J. H. Lee, Prof. S. B. Hong
Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH
Pohang 37673 (Korea)
E-mail: sbhong@postech.ac.kr
+
Y. Zhang, Dr. A. Mayoral
Centre for High-Resolution Electron Microscopy (CℏEM), School of Physical Science and Technology, ShanghaiTech University
Shanghai 201210 (China)
E-mail: amayoral@shanghaitech.edu
[
[
[
[
[
c]
d]
e]
f]
Dr. A. Mayoral
Instituto de Nanociencia y Materiales de Aragon (INMA), CSIC, Universidad de Zaragoza
12, Calle de Pedro Cerbuna, 50009 Zaragoza (Spain)
Dr. A. Mayoral
Laboratorio de Microscopias Avanzadas, Universidad de Zaragoza
Mariano Esquillor Edificio I+D, 50018, Zaragoza (Spain)
Dr. J. Shin, Dr. N. Y. Kang, Dr. Y.-K. Park
Center for Convergent Chemical Process, Korea Research Institute of Chemical Technology
Daejeon 34114 (Korea)
+
Dr. D. Jo
Present address: Center for Convergent Chemical Process, Korea Research Institute of Chemical Technology
Daejeon 34114 (Korea)
These authors contributed equally to this work.
+]
Supporting information for this article is given via a link at the end of the document.
Abstract: Herein we report the synthesis, structure solution, and
catalytic properties of PST-31 with an unprecedented framework
topology. This high-silica (Si/Al = 16) zeolite was synthesized using a
pyrazolium-based dication with a tetramethylene linker as an organic
structure-directing agent (OSDA) in hydroxide media. The PST-31
structure is built from new building layers containing 4-, 5-, 6-, and 7-
rings, which are connected by single 4-rings in the interlayer region to
SC, there are only five, twelve, and two structures that contain 7-,
9-, and 11-rings, respectively.[2] It is worth noting that SSZ-23 (IZA
code STT) is the only one which simultaneously has 7- and 9-
rings.[3] This scarcity of zeolite structures with odd-membered
rings is extended in the hypothetical structure database, the
reason for this is still unclear.[4] On the other hand, Li and Deem
have analyzed a huge number of hypothetical structures in terms
of their framework energy and density, they found that the
probability of frameworks containing 7-rings decreases when
approaching the low-density edge of the structure distribution.[5]
Since the first use of organic structure-directing agents
(OSDAs) by Barrer in zeolite synthesis,[6] the OSDA design has
dominated the discovery of many interesting new zeolite
structures.[ Despite the great success of this approach, however,
the geometric correspondence between the encapsulated OSDA
molecule and the pore structure of the crystallized zeolite is
generally far from close. Apart from the case of ZSM-18 (MEI)
where its cavity and the triquaternary OSDA employed are
form
a two-dimensional pore system. Its channels consist of
6
[
4.5 .6.9.11] and [5.6.7.9.10.11] cavities and are thus delimited by 9-,
1
0-, and 11-rings. The OSDA cations in as-synthesized PST-31 were
2
14
4
2
4
determined to reside without disorder in the large [4 .5 .6 .7 .9 ]
6
cavities composed of smaller [4.5 .6.9.11] and [5.6.7.9.10.11] ones,
leading to a symmetry coincidence between the OSDA and the
surrounding zeolite cavity. The proton form of PST-31 was found to
be selective for the cracking of n-hexane to light olefins.
7]
Introduction
characterized by the same symmetry element (threefold
rotation),[8] most, if not all, OSDAs have been found to remain
disordered within the zeolite pores.
Aluminosilicate zeolites are steadily increasing in use as industrial
catalysts and adsorbents, mainly due to their structural and
chemical stability.[1] Therefore, the discovery of novel zeolite
structures is highly desirable to expand their applications to more
challenging tasks. Regardless of the composition, a total of 253
framework type materials have so far been approved by the
Structure Commission of the International Zeolite Association
Here we present the synthesis and structure of a new
aluminosilicate (Si/Al = 16) zeolite containing rings of T-atoms
with all odd numbers from five to eleven, denoted PST-31, and its
catalytic properties for the cracking of n-hexane. This new zeolite
has been synthesized using a pyrazolium-based dication as an
(IZA-SC) and are conventionally classified as small-, medium-,
+
+
OSDA, together with Na or K , in hydroxide media. We also
demonstrate that the OSDA in as-synthesized PST-31 not only
ends up in an ordered fashion, although highly flexible due to its
central tetramethylene chain, but also shows symmetric matching
large-, and extra-large pore structures which have 8, 10, 12, and
over 12 tetrahedral atoms (T-atoms) in the largest pore opening,
respectively.[
2]
Zeolite structures containing rings of odd numbers of T-atoms
higher than 6, although scarce, are also known. According to IZA-
(inversion center) with the host zeolite cavity. This may in our view
be responsible for directing the unique PST-31 structure.
1
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RESEARCH ARTICLE
Results and Discussion
Recently, we have reported that PST-22 (PWW), a new
medium-pore zeolite with intersecting 10- and 8-ring channels,
can be synthesized using 1,1’-(1,4-butanediyl)bis(2,4-dimethyl-
2
+
1
H-pyrazol-2-ium) dications, denoted 14DMP-C
4
, as an OSDA
2+
under excess fluoride conditions (HF/OSDA = 4 and Si/Al =
0). This stimulated us to examine whether its synthesis is
[
9]
1
possible in the presence of the same OSDA, but without using
toxic fluoride anions. As can be found in Table S1, we were able
Figure 1. a) PXRD patterns of the as-synthesized (black) and proton (red) forms
of PST-31. b) Projection of reciprocal space reconstructed from 3D-EDT data of
H-PST-31 along the c* direction.
to crystallize PST-22 by heating synthesis gels with SiO
2 2 3
/Al O =
2
0 and NaOH/SiO = 0.30-0.35 at 175 °C for 7 days. Detailed
2
characterization results of this PST-22 in comparison to the
identical zeolite obtained in fluoride- media will be given
was calcined at 600 °C to remove the occluded OSDAs (Figure
S3) and then converted to its proton form (H-PST-31), there were
no significant changes in the powder X-ray diffraction (PXRD)
pattern (Figure 1a), indicating its high structural stability. However,
while the 27Al MAS NMR spectrum of as-synthesized PST-31
shows one resonance around 55 ppm assigned to tetrahedral Al,
an additional weak signal around 0 ppm due to octahedral Al is
observable in the spectrum of H-PST-31 (Figure S4). The 29Si
MAS NMR spectra of both as-synthesized and proton forms of
PST-31 are dominated by a broad and asymmetric signal around
elsewhere. Of particular interest is that when the SiO
in the gel was slightly increased to 30, a novel zeolite, denoted
PST-31 was the phase formed at NaOH/SiO = 0.30-0.35. We
2 2 3
/Al O ratio
2
note that like the case of PST-22, the gel composition range
leading to pure PST-31 was also narrow. However, the
replacement of NaOH with the equivalent amount of KOH under
the conditions described above was found to again produce pure
+
+
PST-31, although the use of the other alkali cations, i.e., Li , Rb ,
+
and Cs , was not successful (Table S2).
-110 ppm. The difference in the line shape indicates that a portion
Field emission scanning electron microscopy shows that as-
synthesized PST-31 always appears as very small (< 30 nm)
nanospheres (Figure S1), regardless of the type and amount of
alkali cations employed in its synthesis. 13C magic-angle-spinning
of framework Al atoms has been removed during the calcination
step for OSDA removal, which can be further supported by the
-
1
existence of an IR band at 3655 cm , corresponding to the OH
group of extraframework Al species (Figure S5). On the other
hand, since we were not able to determine the structure of this
new zeolite from PXRD data, we applied
three-dimensional electron diffraction
tomography (3D-EDT) for solving the
PST-31 structure.[
(MAS) nuclear magnetic resonance (NMR) spectroscopy reveals
that its OSDA molecules remain intact (Figure S2). When PST-31
10]
The 3D reciprocal lattice of H-PST-31,
reconstructed from 3D-EDT data, shows
a mirror plane, as marked by a dashed
line in Figure 1b, which indicates the 2/m
Laue symmetry and thus a monoclinic
space group. The unit cell parameters
obtained using
the 3D-EDT data were a = 13.699 Å , b =
1
4.375 Å , c = 17.188 Å , β = 128.7°. The
slices from the reconstructed
2D
reciprocal space (Figure S6) allowed us
to deduce that the reflection conditions
were h0l: l = 2n and 0k0: k = 2n, for which
the space group with the highest
1
symmetry is P2 /c (no. 14). The H-PST-
3
1 structure was solved and refined from
the 3D-EDT data using this space group
and the program Sir2014.[
11]
Rietveld
refinement was also carried out using
synchrotron PXRD data with the
3
Figure 2. a) Double 4-ring unit (top) and its 1,3-stellated-5-open unit (bottom; [4.5 .7]). The T-atoms in stellated standardized lattice parameters (Figure
points and in the other ones are indicated by light green and black balls, respectively. Bridging O atoms have
[12]
S7 and Tables S3-S6).
The final
3
been omitted for clarity. b) PST-31 building chains. These chains, made up of [4.5 .7] units by sharing T-atoms
3
refined unit cell parameters determined
in stellated points, are arrayed along the b-axis to construct a PST-31 building layer. The [4.5 .7] units in each
chain are arranged by glide reflection, and two adjacent PST-31 chains are related to each other by inversion. were a = 13.8222(7) Å , b = 14.3797(5) Å ,
c) Top views of the PST-31 layer consisting of PST-31 chains and extra T-atoms. (Left) The extra T-atoms in
top and bottom sides are indicated by red and blue balls, respectively. (Right) The T-atoms in top and bottom
sides, which will be involved in interlayer connection, are indicated by orange and turquoise blue balls, hydrated H-PST-31.
respectively. The 7-rings including these T-atoms are marked in the same colors. d) The PST-31 structure
viewed along [011]. Its building layers and interlayer single 4-ring units are marked in black and yellow,
respectively. Two adjacent PST-31 layers are related to each other by translation (1/2c). e) Tiling presentation
c = 17.2724(9) Å , β = 128.9719(21)° for
The structure of PST-31 has 12
crystallographically distinct T-sites. Its
of the 2D pore structure of PST-31: the 9-rings are highlighted by thick black lines. Notice that its channels, framework is built up of 1,3-stellated-5-
6
consisting of [4.5 .6.9.11] and [5.6.7.9.10.11] cavities, are delimited by 9-, 10-, and 11-rings.
2
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Angewandte Chemie International Edition
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RESEARCH ARTICLE
layers are related to each other by translation of 0.5c (Figure 2d).
The s4r units at the same height, which are located in the nodes
of the (4,4) net topology, act as pillars. This leads to the formation
of a 2D pore system, which consists of mutually intersecting
6
channels, made up of [4.5 .6.9.11] and [5.6.7.9.10.11] cavities. As
a result, the intersecting channels of PST-31 have multiple
delimiting rings, i.e., 9-, 10-, and 11-rings with dimensions 3.7 ×
4.9, 4.5 × 6.2, and 5.0 × 6.7 Å , respectively (Figures 2e, S9, and
S10). As such, they have the ring sequence 9-11-10-11-9-10 and
are thus undulating in nature. This feature is particularly intriguing
because the pure-silica UZM-55 is the only example of the
s
Figure 3. C -corrected ADF-STEM images of H-PST-31 along the a) [011] and
existence among all zeolite structures of multiple delimiting rings
b) [101] directions, which are superimposed with its structure model. Si, blue;
O, red. The simulated micrograph, indicated by a red box in a), is given for
comparison.
13]
(
10- and 12-rings) in a single channel.[ The framework density
3
(defined as the number of T-atoms per 1000 Å ) of PST-31 was
calculated to be 18.0.
Spherical aberration corrected annular dark field scanning
transmission electron microscopy (C -corrected ADF-STEM)
s
3
open cubic ([4.5 .7]) units as a key building unit (Figure 2a). These
modified double-4 ring (d4r) units are connected one another by
sharing the T-atoms in stellated points (in green), with glide
arrangement, to form the PST-31 building chain (Figure 2b). The
PST-31 building layer is then created by a combination of PST-31
chains and extra T-atoms, where the two adjacent chains are
related by inversion symmetry (Figure 2b,c). It should be noted
that the PST-31 layer contains one type of 7-rings, as well as 4-,
supports the reliability of the H-PST-31 structure determination
(Figure 3). In particular, the image of H-PST-31 observed along
[011] allows clear observation of the channels surrounded by the
building layers and interlayer s4r units, consistent with Figure 2d.
It is also remarkable that the [4.5 .6.9.11] and [5.6.7.9.10.11] tiles
in the tiling presentation of the PST-31 structure (Figure 2e) have
6
a ‘weak’ ring (one face larger than all the other faces in a tile; here,
the 11-ring).[ This means that both tiles are not ‘natural’ tiles.
14]
[14]
5
-, and 6-rings, which consist of four T-atoms with three (not four)
intralayer connections and are equally distributed in both top and
bottom sides. Also, there is the other type of 7-rings in the middle
of the layer (Figure S8). Regardless of the size of these 7-rings,
however, the PST-31 layer itself is nonporous in nature due to the
presence of 6-rings between 7-rings connected along the
direction perpendicular to the layer.
On the other hand, the PST-31 layers are stacked along the
a-axis via the connection between intralayer 7-rings (Figure 2c,
right) and interlayer single 4-ring (s4r) units, where two adjacent
Furthermore, the tiling arrangement for the entire structure,
[
15]
calculated using the program package ToposPro, was found to
2
2
2
2
2
3
be [4.5 .6] + [4.5.6.7] + [5 .6 ] + [5.6 .7] + [4 .5 .7] + [5.6.7.9.10.11]
6
2
2
+ [4.5 .6.9.11]; only [5 .6 ] (t-pes) is a natural tile (Figure S11).
Consequently, unlike all zeolite structures known to date,[2]
constructing the natural tiling (with only strong rings) for the PST-
31 framework was not possible since an edge is simultaneously
adjacent to the weak rings. If so, merging small tiles through weak
rings would lead the larger tile to contain the edge inside itself,
thus not allowing natural tiling of the
PST-31 structure.
We next carried out PXRD and
Rietveld analyses on the dehydrated, as-
synthesized PST-31 to determine the
OSDA location (Figure S12 and Tables
S8-S11). A piece of the positive electron
density remaining after initial scaling,[16]
corresponding
to
a
14DMP-C 2+
4
molecule, was determined to be located
2
14
4
2
4
within the large [4 .5 .6 .7 .9 ] cavity
6
consisting of two [4.5 .6.9.11] and two
[5.6.7.9.10.11] ones (Figure 4a). We also
note that this OSDA spans the 10- and
1
1-rings, but not the 9-rings (Figure S13).
6
The centroids of adjacent [4.5 .6.9.11]
and [5.6.7.9.10.11] cavities, halves of the
2
14
4
2
4
[4 .5 .6 .7 .9 ] one, were found to be
near those of the pyrazolium rings,
respectively. More interestingly, the
dication exactly follows the space group
Figure 4. a) Refined structure of as-synthesized PST-31 with occluded 14DMP-C
4
2+. Si, blue and yellow in
PST-31 layers and single 4-ring units, respectively; O, red; C, brown; N, pale blue. The regions marked in
translucent green indicate the positive difference electron density maps visualized using the whole data set, symmetry of the PST-31 framework
after refining the framework atoms only against the high-angle (d-space < ~2 Å) data. b) The configuration (left)
without disorder: both the OSDA and
2
+
2
14
4
2
4
of 14DMP-C
[
4
encapsulated within the large [4 .5 .6 .7 .9 ] cavity (middle). Both the OSDA and
2
14
4
2
4
42.5 .6 .7 .9 ] cavity have an inversion center at the same crystallographic position. Their inversion center, [4 .5 .6 .7 .9 ] cavity have same
14
4
2
4
2 14 4 2 4
indicated by a black dot, is guided with dashed lines. The [4 .5 .6 .7 .9 ] cavity (right) consisting of two
inversion center (Figure 4b), unlike the
6
2
14
4
2
4
[
4.5 .6.9.11] and two [5.6.7.9.10.11] cavities. c) Two different views of the [4 .5 .6 .7 .9 ] cavity containing
2
+
case of PST-22 that can be synthesized
1
4DMP-C . (Left) The distances between the host cavity and guest molecule, shorter than 3.5 Å, are marked.
4
6
[9]
(Right) The centroids of adjacent [4.5 .6.9.11] and [5.6.7.9.10.11] cavities are indicated by green and orange using the same OSDA. This suggests
dots guided with dashed lines, respectively. These centroids are located close to those of the pyrazolium rings
in the OSDA, respectively.
that the point group symmetry of the host
3
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RESEARCH ARTICLE
The Ar adsorption data reveal that H-PST-31 with a bulk Si/Al
3
-1
ratio of 16 has a micropore volume of 0.13 cm g (Figure S17).
While the pore size distribution curve of H-PST-31 calculated
using the Horvath-Kawazoe formalism is characterized by one
sharp maximum at 4.4 Å , the curve calculated using density
functional theory shows not only a sharp band at 5 Å , but also a
broad one centered at ca. 400 Å , indicative of the presence of
3
interparticle pores (Figure S18). NH temperature-programmed
desorption and IR spectroscopy with adsorbed pyridine reveal
that its acidic properties are similar to those of H-ZSM-5 with Si/Al
= 15 (Figure S19 and Table S17). From competitive cracking of
n-hexane and 3-methylpentane, H-PST-31 were calculated to
have a constraint index of 9.7, falling within the values for
medium-pore zeolites (Figure S20).[21] We also reacted H-PST-31
with n-hexane at 650 °C and 12.45 h-1 weight hourly space
velocity and compared the results with those of H-ZSM-5 with a
similar Si/Al ratio (15). The catalytic cracking of n-hexane is a test
reaction of naphtha cracking to assess the performance of zeolite
catalysts and the reaction mechanism.[ Interestingly, H-PST-31
Figure 5. a) n-Hexane conversion and b) selectivity to and c) yield of ethylene
and propylene as a function of time on stream in the n-hexane cracking over H-
PST-31 and H-ZSM-5 at 650 °C and 12.45 h-1 WHSV.
cavity is dictated by that of the guest molecule. Their close relation
can be further supported by the multiple short distances (< 3.5 Å )
between the C atoms in the OSDA and the framework O atoms
(Figure 4c).
We compared the experimentally determined crystal
22]
structures of a series of diazolium-based dication salts with
different head groups and methylene chain lengths (Table S12),[17] is characterized by a higher yield of ethylene and propylene at
referred to as “diazole acronym”-C 2+, where n is the methylene
n
early time on stream than H-ZSM-5 (Figure 5). Given that the
commercial naphtha cracking plant is run in a fluidized bed due to
rapid coke deposition, the initial catalytic performance is of prime
importance. This renders H-PST-31 attractive as a fluidized
catalytic cracking additive, which deserves further study.
chain length (3-6). Most of the dications with n = 3-5 had no
molecular symmetry. However, we note that while some cations
with odd-numbered chain lengths are characterized by a 2-fold
rotational axis, some with n = 4 and all with n = 6 possess an
2+
inversion center, like 14DMP-C
4
in as-synthesized PST-31. In
fact, these two symmetries are the highest ones theoretically
possible for the corresponding cations. The conformation of
Conclusion
2+
14DMP-C
4
was also found to be reasonable when compared to
2+
that of other cations, for example, 1MI-C
4
, where 1MI is 1-
In summary, we have synthesized a novel high-silica zeolite
PST-31 with abundant odd-membered rings (all from five to
eleven), using an OSDA consisting of two pyrazolium moieties
linked by a tetramethylene chain in the hydroxide media. In
contrast to all 253 zeolite structures recognized by the IZA-SC,
we were not able to describe the PST-31 framework structure by
natural tiling. The intersecting channels in its 2D pore system are
composed of two types of tile, both of which possess a weak 11-
ring. Consequently, they are delimited by rings of three different
sizes (i.e., 9-, 10-, and 11-rings). Structural analysis reveals the
transmission of symmetry (inversion) from the OSDA to the host
zeolite cavity in as-synthesized PST-31. We also found that H-
PST-31 is promising for catalytic cracking applications.
methylimidazole (Figure S14 and Table S12). In particular, its
stabilization energy in the PST-31 structure was calculated to be
-
1
-
11.2 kJ (mol Si) , which is lower than the values of any of the
other dications with different head groups and chain lengths
Table S13).[18] Given both the molecular symmetry and shape,
(
therefore, a combination of the 14DMP head group and the
tetramethylene linker appears to provide an optimum OSDA for
the crystallization of PST-31. In addition, the fact that the gel
composition range yielding pure PST-31 with abundant odd-
membered rings is narrow (Tables S1 and S2) suggests that the
structure-directing effect of 14DMP-C 2+
may be specific rather
4
than strong. This is because the conformation of flexible OSDAs,
which affects the phase selectivity of the crystallization, can be
altered by the type and concentration of inorganic components in
synthesis mixtures.[19]
Acknowledgements
From a structural point of view, on the other hand, we were
aware that the tetrahedrality of the resulting structures could be
maintained, although the interlayer s4r units in PST-31 are
eliminated or replaced by d4r units (Figure S15 and Table S14).
The same result was obtained when the symmetry operations
relating the two adjacent PST-31 layers are other than translation
along the c-axis (i.e., translation along b-axis, reflection, and glide
reflection). As a result, we were able to generate a total of 11 new
hypothetical structures built from PST-31 layers (Tables S14 and
Figure S16). The largest ring size in these structures was found
to vary with the size of the interlayer unit: 7-8 for no unit, 9-11 for
s4r, and 11-13 for d4r (Table S16). Nine of them meet the local
interatomic distance criteria (Table S15) and are thus
This work was supported by the National Creative Research
Initiative Program (2012R1A3A2048833) through the National
Research Foundation of Korea and the National Research
Council of Science & Technology (CRC-14-1-KRICT) grant by the
Korea government (MSIP). Y.Z. and A.M. acknowledge the
National Natural Science Foundation of China (NFSC-
21850410448 and NSFC-21835002) and to The Centre for High-
resolution Electron Microscopy (CħEM), supported by SPST of
ShanghaiTech University under contract No. EM02161943. A.M.
also acknowledges the Spanish Ministry of Science under the
Ramon y Cajal Program (RYC2018-024561-I) and the Regional
Government of Aragon (DGA E13_20R). We thank Profs. R. G.
Bell (UCL) and V. A. Blatov (Samara University) for helpful
discussion and PAL for synchrotron diffraction experiments at
beamlines 5A (H. H. Lee) and 9B (D. Ahn and Y. H. Jung). PAL is
supported by MSIP and POSTECH.
synthesizable.[20] It is interesting to note that despite its chemical
feasibility, we were unable to describe the PST-31_H8 structure
with 11- and 13-membered delimiting rings in a single channel by
natural tiling, like the PST-31 case.
4
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RESEARCH ARTICLE
Keywords: aluminosilicates • electron diffraction • odd-
membered rings • structure elucidation • zeolites
[
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This article is protected by copyright. All rights reserved.

Angewandte Chemie International Edition
10.1002/anie.202015483
RESEARCH ARTICLE
Entry for the Table of Contents
Abundant odd-membered rings: PST-31, a novel aluminosilicate zeolite with all odd-membered rings from five to eleven, has been
synthesized in hydroxide media.
6
This article is protected by copyright. All rights reserved.