1560-93-6Relevant academic research and scientific papers
Facile and cost-effective synthesis of acidity-enhanced amorphous silica-alumina for high-performance isomerization
Li, Tao,Tao, Zhichao,Yang, Yong,Zhang, Ling
, (2021)
To achieve facile cost-effective synthesis of acidity-enhanced amorphous silica-alumina (ASA), a water-based sol-gel process is developed. Effectively, this method not only enhances acid sites density, but also lowers the cost by using aluminum nitrate nonahydrate instead of expensive organic aluminum precursor. The resulting material has a uniform mesopore distribution (~3.8 ?nm) and a large surface area (455 ?m2/g), with very few micropores. And the Br?nsted-site density (200 ?°C) is 1.5 times higher than that of commercialized ASA Siral 70, which is ascribed to the abundant four- and five-coordinated aluminum species. The effectiveness of this as-synthesized ASA has been demonstrated for n-hexadecane hydroisomerization, affording a multi-branched isomer yield of 43.1%. In addition, good performance can be expected in other bulky-molecule-involved cracking and alkylation processes.
Shape Selectivity in Hydroisomerization of n-Hexadecane over Pd Supported on Zeolites: ZSM-22, ZSM-12 and Beta
Bai, Xuefeng,Lin, Hailong,Maximov, A. L.,Wang, Wei,Wu, Wei,Xiao, Linfei,Zhang, Jianwei
, p. 1427 - 1437 (2020/10/27)
The development of bifunctional catalysts with high branched isomers selectivity in hydroisomerization of n-alkanes constantly remains crucial for the manufacture of green biodiesel from vegetable oil. Three bifunctional catalysts (Pd/zeolite) were prepar
Pd/SAPO-41 Bifunctional Catalysts with Enhanced Pd Dispersion Prepared by Ultrasonic-Assisted Impregnation: High Selectivity for n-Hexadecane Hydroisomerization
Bai, Xuefeng,Guo, Chunmu,Jia, Guozhi,Li, Tong,Maximov, A. L.,Su, Xiaofang,Wang, Wei,Wei, Xiaomeng,Wu, Wei
, p. 502 - 511 (2020/05/29)
Two series of Pd/SAPO-41 bifunctional catalysts were synthesized via the ultrasonic-assisted impregnation (xPd/S41-U) with different treating time and conventional incipient wetness impregnation methods (0.30Pd/S41-I) on the SAPO-41 molecular sieve, respe
Manipulating catalytic pathways: Deoxygenation of palmitic acid on multifunctional catalysts
Peng, Baoxiang,Zhao, Chen,Kasakov, Stanislav,Foraita, Sebastian,Lercher, Johannes A.
, p. 4732 - 4741 (2013/05/22)
The mechanism of the catalytic reduction of palmitic acid to n-pentadecane at 260 °C in the presence of hydrogen over catalysts combining multiple functions has been explored. The reaction involves rate-determining reduction of the carboxylic group of palmitic acid to give hexadecanal, which is catalyzed either solely by Ni or synergistically by Ni and the ZrO2 support. The latter route involves adsorption of the carboxylic acid group at an oxygen vacancy of ZrO2 and abstraction of the α-H with elimination of O to produce the ketene, which is in turn hydrogenated to the aldehyde over Ni sites. The aldehyde is subsequently decarbonylated to n-pentadecane on Ni. The rate of deoxygenation of palmitic acid is higher on Ni/ZrO2 than that on Ni/SiO2 or Ni/Al2O3, but is slower than that on H-zeolite-supported Ni. As the partial pressure of H2 is decreased, the overall deoxygenation rate decreases. In the absence of H 2, ketonization catalyzed by ZrO2 is the dominant reaction. Pd/C favors direct decarboxylation (-CO2), while Pt/C and Raney Ni catalyze the direct decarbonylation pathway (-CO). The rate of deoxygenation of palmitic acid (in units of mmol moltotal metal -1 h-1) decreases in the sequence r (Pt black)≈r(Pd black)>r(Raney Ni) in the absence of H2. In situ IR spectroscopy unequivocally shows the presence of adsorbed ketene (Ci?￡34;Ci?￡34;O) on the surface of ZrO2 during the reaction with palmitic acid at 260 °C in the presence or absence of H2. Biomass to biofuels: The conversion of palmitic acid to n-pentadecane over ZrO2 mainly proceeds by hydrogenation of the carboxylic acid group to give hexadecanal (rate-determining step), which is catalyzed either solely by Ni sites or synergistically by Ni sites and sites on the ZrO2 support (see scheme). In the absence of H2, ketonization is the dominant reaction catalyzed by ZrO 2. Copyright
COMBINATION COMPOSITION COMPRISING BENZOYL PEROXIDE AND ADAPALENE
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, (2012/10/08)
An aqueous gel composition of the present invention comprising about 0.1 to 0.3 wt % adapalene and about 2.5 to 5.0 wt % benzoyl peroxide, as active ingredients, wherein both the active ingredients are stabilized in hydrophilic gelling matrix of pH dependent gelling agent comprising crosslinked, acrylic acid-based polymer(s).
Process for hydrogenation of carboxylic acids and derivatives to hydrocarbons
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Page/Page column 7-8, (2008/06/13)
A process for hydrogenating a carboxylic acid and/or derivative thereof having a carboxylate group represented by the general formula R1COO-, which process comprises feeding hydrogen and the carboxylic acid and/or derivative thereof to a reactor and maintaining conditions within the reactor such that hydrogen reacts with the carboxylic acid and/or derivative thereof to produce a product stream comprising carbon dioxide, carbon monoxide, methane and hydrocarbons represented by general formulae R1H and R1CH3, characterised in that the molar ratio of R1H : R1CH3 is above a pre-determined value and/or the mole ratio of the sum of carbon dioxide, carbon monoxide and methane to carboxylate groups is above a pre-determined value.
