636-25-9Relevant academic research and scientific papers
In Situ Confined Growth Based on a Self-Templating Reduction Strategy of Highly Dispersed Ni Nanoparticles in Hierarchical Yolk–Shell Fe@SiO2 Structures as Efficient Catalysts
Jiao, Jiao,Wang, Haiyan,Guo, Wanchun,Li, Ruifei,Tian, Kesong,Xu, Zhaopeng,Jia, Yin,Wu, Yuehao,Cao, Ling
, p. 3534 - 3540 (2016)
Ni-based magnetic catalysts exhibit moderate activity, low cost, and magnetic reusability in hydrogenation reactions. However, Ni nanoparticles anchored on magnetic supports commonly suffer from undesirable agglomeration during catalytic reactions due to
Facet-Dependent and Light-Assisted Efficient Hydrogen Evolution from Ammonia Borane Using Gold–Palladium Core–Shell Nanocatalysts
Rej, Sourav,Hsia, Chi-Fu,Chen, Tzu-Yu,Lin, Fan-Cheng,Huang, Jer-Shing,Huang, Michael H.
, p. 7222 - 7226 (2016)
Au–Pd core–shell nanocrystals with tetrahexahedral (THH), cubic, and octahedral shapes and comparable sizes were synthesized. Similar-sized Au and Pd cubes and octahedra were also prepared. These nanocrystals were used for the hydrogen-evolution reaction
Aqueous phase synthesis of Au-Ag core-shell nanocrystals with tunable shapes and their optical and catalytic properties
Tsao, Yu-Chi,Rej, Sourav,Chiu, Chun-Ya,Huang, Michael H.
, p. 396 - 404 (2014)
In this study, rhombic dodecahedral gold nanocrystals were used as cores for the generation of Au-Ag core-shell nanocrystals with cubic, truncated cubic, cuboctahedral, truncated octahedral, and octahedral structures. Gold nanocrystals were added to an aq
A combined mechanochemical and calcination route to mixed cobalt oxides for the selective catalytic reduction of nitrophenols
Shultz, Lorianne R.,McCullough, Bryan,Newsome, Wesley J.,Ali, Haider,Shaw, Thomas E.,Davis, Kristopher O.,Uribe-Romo, Fernando J.,Baudelet, Matthieu,Jurca, Titel
, (2020/01/11)
Para-, or 4-nitrophenol, and related nitroaromatics are broadly used compounds in industrial processes and as a result are among the most common anthropogenic pollutants in aqueous industrial efiuent; this requires development of practical remediation str
Record-high catalytic hydrogenated activity in nitroarenes reduction derived from in-situ nascent active metals enabled by constructing bimetallic phosphate
Yang, Fu,Wang, Jin,Gao, Shuying,Zhou, Shijian,Kong, Yan
, (2020/03/10)
Herein, we report an excellent in-situ exsolution triggered hydrogenated catalyst F-Ni/Cu-P-RT started from bimetallic phosphate Ni/Cu-P-RT, affording an ultrafast catalytic hydrogenated rate (20 s even 5 s) in nitrophenol reduction. In the first catalytic cycle, we proved the enhanced catalytic reduction activity of bimetallic Ni/Cu-P-RT within 50 s compared to monometallic counterparts. The kinetics results revealed Ni/Cu-P-RT affords the reaction rate K of 2.85/4.23/6.6 min?1 at 20, 30, and 40 °C with the activation energy 32 kJ/mol. Impressively, the involved reaction induction period is visibly observed and interpreted by reconstruction and evolution of active metal during the reaction, but was eliminated through integrating two metal Cu-Ni by regulation of electronic band energy of phosphate from 4.1–3.5 eV. The nascent Cu and Ni nanoparticles as reaction-preferred active species were in-situ exsolved partially after adding NaBH4, triggering the resulted higher active and stable F-Ni/Cu-P-RT(20 s, 14.1 min?1) in later multiple cycles.
Switchable Bifunctional Bistate Reusable ZnO-Cu for Selective Oxidation and Reduction Reaction
Sarmah, Kasturi,Mukhopadhyay, Subhamoy,Maji, Tarun K.,Pratihar, Sanjay
, p. 732 - 745 (2019/01/11)
Herein we disclosed the utilization of copper loaded zinc oxide (ZnO-Cu) for its stimuli (O2/light) responsive switchable performance between its reduced (S-1) and oxidized (S-2) state for two antagonistic reactions, namely oxidation of alkyl arenes/heteroarenes to aldehydes/ketones and reduction of nitro arenes/heteroarenes to corresponding amines. The two states of the catalyst showed its switchable performance as highly active and poorly active catalyst for oxidation and reduction, and both reactions could be turned "off" and "on" by changing the stimuli (light and O2/N2). The switching efficiency between the states and their relative reactivity were found to be consistent under variety of reaction conditions and remain unaltered irrespective of oxidation-reduction (or vice versa) sequence and substrates used in the reaction. The photo catalysts (S-1 and S-2) demonstrated good catalytic activity, multiple reusability, broad substrate scope, and reasonable functional group tolerance for both the reactions and probed its quality performance in a large-scale setup. The system was used in an assisted tandem catalysis setup for the synthesis of benzyl amines utilizing both oxidation and reduction reaction by stimuli responsive switching between the states of the catalyst.
High catalytic activity of a new Ag phosphorus ylide complex supported on montmorillonite: synthesis, characterization, and application for room temperature nitro reduction
Karami, Kazem,Rahimi, Mahzad,Dinari, Mohammad
, p. 281 - 291 (2018/03/29)
In this work, the phosphorus ylide, [PPh3CHC(O)CH2Cl], was reacted with AgNO3 to give the [Ag{C(H)PPh3C(O)CH2Cl}2]+NO3? as the product. Then, it was supported on the modified montmorillonite nanoclay to prepare a new catalyst for the reduction reaction. The structure and morphology of the nanoclay catalyst were characterized by FT-IR, X-ray powder diffraction, scanning electron microscopy, energy-dispersive X-ray analysis and transmission electron microscopy techniques; also, the content of silver was obtained by inductively coupled plasma analyzer. This composition was exploited to study its catalytic activity in the reduction in aromatic nitro compounds; it displayed the high catalytic activity. Factors such as catalyst amount, solvent, temperature and reaction time were all systematically investigated to elucidate their effects on the yield of catalytic reduction in nitroarenes. This catalytic system exhibited high activity toward aromatic nitro compounds under mild conditions. The catalyst was reused five times without any significant loss in its catalytic activity.
Gold nanoparticles-supported histamine-grafted monolithic capillaries as efficient microreactors for flow-through reduction of nitro-containing compounds
Liu,Guerrouache,Kebe,Carbonnier,Le Droumaguet
, p. 11805 - 11814 (2017/07/10)
A histamine functionalized monolith was synthesized within a micro-sized channel as a permeable support for the immobilization of 5, 20 and 100 nm-sized gold nanoparticles and the resulting nanostructured hybrid monoliths were applied as microreactors for the catalytic reduction of nitro-derivatives. The whole synthetic pathway of the composite materials relies on (i) UV-induced polymerization of N-acryloxysuccinimide and ethylene glycol dimethacrylate in toluene, (ii) surface grafting of histamine through nucleophilic substitution of hydroxysuccinimide leaving groups, and (iii) specific adsorption of citrate-stabilized colloidal gold nanoparticles. The achievement of the successive synthetic steps was ascertained by using a combination of experimental techniques providing information about the chemical composition (FTIR, Raman, and EDX) and porosity and surface-dispersion (SEM) of gold nanoparticles. Of particular interest, it is shown that surface-grafted histamine units exhibit strong affinity towards gold nanoparticles and allow homogeneous and dense dispersion of 5 and 20 nm sized nanoparticles. Consequently, the gold nanoparticle size-dependence of the catalytic activity (conversion of nitro and di-nitro aromatic compounds into the corresponding amino and di-amino-derivatives) was demonstrated, highlighting the utmost importance of controlling the dispersion of nano-catalysts on the support surface, while histamine protonation was also evidenced as a parameter of paramount importance regarding nanogold surface density and thus resulting catalytic activity. Histamine protonation notably allows the generation of electrostatic interactions between citrate-coated gold nanoparticles and thus-formed positive charges at the monolith surface.
Controllable synthesis of core-satellite Fe3O4@polypyrrole/Pd nanoarchitectures with aggregation-free Pd nanocrystals confined into polypyrrole satellites as magnetically recoverable and highly efficient heterogeneous catalysts
Guo, Wanchun,Jiao, Jiao,Tian, Kesong,Tang, Yongfu,Jia, Yin,Li, Ruifei,Xu, Zhaopeng,Wang, Haiyan
, p. 102210 - 102218 (2015/12/11)
A soft template-assisted simultaneous redox strategy has been developed to fabricate Fe3O4@polypyrrole/Pd (Fe3O4@PPy/Pd) nanocomposites with a single Fe3O4 core and multiple PPy satellites,
In situ formed metal nanoparticle systems for catalytic reduction of nitroaromatic compounds
Wu, Xiao-Qiong,Wu, Xing-Wen,Shen, Jiang-Shan,Zhang, Hong-Wu
, p. 49287 - 49294 (2014/12/11)
Developing robust and facile catalytic systems for converting nitroaromatic compounds to NH2-containing compounds are of importance to decrease or even eliminate their toxicity or risk in the environment. In view of in situ formed metal nanoparticles, the metal ion (Cu2+, Ag+, AuCl4-, Co2+ and Ni2+)/NaBH4 systems were employed to catalyze the reduction reaction of nitroaromatic compounds. By employing the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) as a model reaction, the effects of concentration of NaBH4, 4-NP and metal ions on the rate constants of the catalytic reduction reactions were systematically investigated. Apparent activation energies of these metal ion/NaBH4 catalytic systems were further measured and compared. In situ formed metal NPs could be characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Furthermore, these metal ion/NaBH4 systems were successfully employed to catalyze the reduction reaction of a series of other nitroaromatic compounds. These metal ion/NaBH4 catalytic systems investigated in this protocol are simple and do not require the preparation of metal nanoparticles in advance, compared with previous related reports. This journal is
