scholarly journals A Review on the Catalytic Decomposition of NO by Perovskite-Type Oxides

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 622
Author(s):  
Qiuwan Shen ◽  
Shuangshuang Dong ◽  
Shian Li ◽  
Guogang Yang ◽  
Xinxiang Pan
Keyword(s):  
Mixed Oxides ◽  
Low Cost ◽  
Influence Factors ◽  
Catalytic Decomposition ◽  
Catalytic Performance ◽  
No Decomposition ◽  
Reaction Conditions ◽  
A Site ◽  
Perovskite Type ◽  
Decomposition Of No

Direct catalytic decomposition of NO has the advantages of being a simple process, producing no secondary pollution, and being good for the economy, which has attracted extensive research in recent years. Perovskite-type mixed oxides, with an ABO3 or A2BO4 structure, are promising materials as catalysts for NO decomposition due to their low cost, high thermal stability, and, of course, their good catalytic performances. In this review, the influence factors, such as A-site substitution, B-site substitution and reaction conditions on the catalytic performance of catalysts have been expounded. The reaction mechanisms of direct NO decomposition are also discussed. Finally, major conclusions are drawn and some research challenges are highlighted.

Influence of Catalysts with Different Templates on Direct Decomposition of NO in Cement Kiln Exhaust

2018 ◽  
Vol 913 ◽  
pp. 948-953
Author(s):  
Yan Ling Gan ◽  
Su Ping Cui ◽  
Hong Xia Guo ◽  
Xiao Yu Ma ◽  
Ya Li Wang
Keyword(s):  
Surface Area ◽  
Decomposition Rate ◽  
Nitrogen Adsorption ◽  
Catalytic Performance ◽  
Direct Decomposition ◽  
No Decomposition ◽  
Bet Surface Area ◽  
Cement Kiln ◽  
Porous Catalyst ◽  
Decomposition Of No

The influence of catalysts with different templates on direct decomposition of NO in cement kiln exhaust was studied in this paper. The NO direct decomposition rate of porous catalyst materials with different templates was determined by infrared spectrometer. And pore structure and the microstructure of the catalysts were characterized by BET surface area, nitrogen adsorption-desorption. The results show that the catalytic performance of porous catalyst without any template is better than catalysts with other templates at low temperature. When the temperature reached 550 °C, NO decomposition rate of porous catalyst with CTAB could reach to more than 80%. And meanwhile, the catalysts with organic template reagent have higher BET surface area than those with inorganic template agent. With the increasing of the reaction time, the NO decomposition rate decreases. After reaction for 3 hours, the decomposition rate decreases from 80% to 40%.

Synthesis of Glycerol Carbonate by Transesterification of Glycerol with Dimethyl Carbonate over Mg-Al Mixed Oxides Supported on MCM-41

2014 ◽  
Vol 1008-1009 ◽  
pp. 319-322
Author(s):  
Gong De Wu ◽  
Xiao Li Wang ◽  
Zhi Li Zhai ◽  
Ao Yun Cao
Keyword(s):  
Dimethyl Carbonate ◽  
Mixed Oxides ◽  
Supported Catalysts ◽  
Catalytic Performance ◽  
Molar Ratio ◽  
Catalyst Loading ◽  
Glycerol Carbonate ◽  
Reaction Conditions ◽  
Glycerol Conversion ◽  
Mcm 41

The Mg-Al mixed oxides were deposited on the MCM-41 via the coprecipitation followed by thermal decomposition and characterized by many techniques. In the transesterification of glycerol (GL) with dimethyl carbonate (DMC), the resulting supported catalysts exhibited much higher catalytic performance than the pure Mg-Al mixed oxides, which was ascribed to the increased basicity. Under the optimal reaction conditions, the obtained data showed that at DMC/glycerol molar ratio of 3:1, catalyst loading of 0.3 g and reaction temperature of 373 K, the glycerol conversion and glycerol carbonate yield from the process was 98.7 % and 92.5%, respectively.

scholarly journals Synthesis of Benzil by Air Oxidation of Benzoin and M(Salen) Catalyst

2019 ◽  
pp. 1-8 ◽  
Author(s):  
Qiuxin Shen ◽  
Liting Xu ◽  
Yiyan Jiang ◽  
Ran Zheng ◽  
Yiping Zhang
Keyword(s):  
Catalytic Activity ◽  
High Performance ◽  
Low Cost ◽  
Catalytic Performance ◽  
Air Oxidation ◽  
Catalyst Recycling ◽  
Reaction Conditions ◽  
Salen Complex ◽  
1H Nuclear Magnetic Resonance ◽  
Optimum Reaction

Bis salicylaldehyde ethylenediamine Schiff base (Salen) and its complexes with three metal ions (Co2+, Ni2+, Zn2+) were prepared, and characterized by infrared spectroscopy(IR). Using air as oxygen source, the optimum reaction conditions for the catalytic oxidation of 0.05 mol benzoin by Co (Salen) were obtained by orthogonal test as follows: base KOH 2 g, catalyst 1.5 g, N, N-dimethylformamide(DMF) as solvent, reaction temperature 40 °C, reaction time 1 h. Under these conditions, the catalytic performances of different metal complexes were investigated. The catalytic activity of Co(Salen) was the best one, the yield of benzil was up to 93.6%, the number of Ni(Salen) and Zn(Salen) was 86.3% and 82.1%, respectively. The reused catalytic performance of M(Salen) complex was also studied. The catalytic activity of Co(Salen), Ni(Salen) and Zn(Salen) was stable after 4 times recycle, the yield of benzil was 71.4%, 63.3% and 57.4%, respectively, and it was easy for catalyst recycling. The oxidation product was certainly benzil with high purity according to the characterization results of melting point(MP), IR, high performance liquid chromatography(HPLC) and 1H nuclear magnetic resonance(1H NMR). Compared with the common synthetic method of benzil, this one has the advantages of friendly environment, low cost and easy operation. It is a simple and green way to synthesize benzoyl efficiently.

scholarly journals Comparison of novel Ni doped exsolution perovskites as methane dry reforming catalysts

2021 ◽  
Vol 266 ◽  
pp. 02019
Author(s):  
L. Lindenthal ◽  
F. Schrenk ◽  
R. Rameshan ◽  
C. Rameshan ◽  
L. Kronlachner ◽  
...  
Keyword(s):  
Annealing Temperature ◽  
Catalytic Performance ◽  
Dry Reforming ◽  
Ni Doping ◽  
X Ray ◽  
Reforming Catalysts ◽  
Reaction Atmosphere ◽  
Reductive Treatment ◽  
A Site ◽  
Perovskite Type

Three perovskite-type materials with a different amount of B-site Ni doping have been tested for their catalytic performance during me-thane dry reforming (MDR) followed by characterization with X-ray dif-fraction (XRD) and scanning electron microscopy (SEM). They could be activated via a reductive treatment (either during a pre-reduction step or di-rectly in reducing reaction atmosphere), the main activating mechanism be-ing the formation of Ni nanoparticles on the surface by exsolution. The catalytic activity increased with the particle size and density. The particle distribution properties could be improved by increasing the amount of Ni doping from 3 % to 10 %, by using an A-site sub-stoichiometric perovskite and by choosing a higher annealing temperature during material prepara-tion. A deactivation over time was observed, due to segregation of CaCO3 on the surface, but no coking or particle sintering occurred

Electrodeposited Ni-Fe-P-FeMnO3/Fe multi-stage nanostructured electrocatalyst with superior catalytic performance for water splitting

2021 ◽  
Author(s):  
Xiao Tan ◽  
Xin Liu ◽  
Yingying Si ◽  
Zunhang Lv ◽  
Zihan Li ◽  
...  
Keyword(s):  
Water Splitting ◽  
Alkaline Solution ◽  
Low Cost ◽  
Catalytic Performance ◽  
Multi Stage

It is very important to design and prepare low-cost and efficiency electrocatalysts for water splitting in alkaline solution. In this works, Ni-Fe-P and Ni-Fe-P-FeMnO3 electrocatalysts are developed using facile electrodeposition...

scholarly journals Shape Effects of Ceria Nanoparticles on the Water‒Gas Shift Performance of CuOx/CeO2 Catalysts

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 753
Author(s):  
Maria Lykaki ◽  
Sofia Stefa ◽  
Sónia A. C. Carabineiro ◽  
Miguel A. Soria ◽  
Luís M. Madeira ◽  
...  
Keyword(s):  
Low Cost ◽  
Catalytic Performance ◽  
Fine Tuning ◽  
Water Gas Shift ◽  
Oxygen Species ◽  
Ceria Nanoparticles ◽  
Ceo2 Sample ◽  
Equilibrium Conversion ◽  
Shape Effects ◽  
Water Gas

The copper–ceria (CuOx/CeO2) system has been extensively investigated in several catalytic processes, given its distinctive properties and considerable low cost compared to noble metal-based catalysts. The fine-tuning of key parameters, e.g., the particle size and shape of individual counterparts, can significantly affect the physicochemical properties and subsequently the catalytic performance of the binary oxide. To this end, the present work focuses on the morphology effects of ceria nanoparticles, i.e., nanopolyhedra (P), nanocubes (C), and nanorods (R), on the water–gas shift (WGS) performance of CuOx/CeO2 catalysts. Various characterization techniques were employed to unveil the effect of shape on the structural, redox and surface properties. According to the acquired results, the support morphology affects to a different extent the reducibility and mobility of oxygen species, following the trend: R > P > C. This consequently influences copper–ceria interactions and the stabilization of partially reduced copper species (Cu+) through the Cu2+/Cu+ and Ce4+/Ce3+ redox cycles. Regarding the WGS performance, bare ceria supports exhibit no activity, while the addition of copper to the different ceria nanostructures alters significantly this behaviour. The CuOx/CeO2 sample of rod-like morphology demonstrates the best catalytic activity and stability, approaching the thermodynamic equilibrium conversion at 350 °C. The greater abundance in loosely bound oxygen species, oxygen vacancies and highly dispersed Cu+ species can be mainly accounted for its superior catalytic performance.

scholarly journals A monodispersed CuPt alloy: synthesis and its superior catalytic performance in the hydrogen evolution reaction over a full pH range

RSC Advances ◽  
2021 ◽  
Vol 11 (21) ◽  
pp. 12470-12475
Author(s):  
Xinmei Liu ◽  
Chen Liang ◽  
Wenlong Yang ◽  
Chunyang Yang ◽  
Jiaqi Lin ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
High Stability ◽  
Low Cost ◽  
Catalytic Performance ◽  
Ph Range

An effective approach to achieve the low cost and high stability of electro-catalysts for HER.

scholarly journals Optimizing the Reaction Conditions for the Formation of Fumarate via Trans-Hydrogenation

2021 ◽  
Author(s):  
Laura Wienands ◽  
Franziska Theiß ◽  
James Eills ◽  
Lorenz Rösler ◽  
Stephan Knecht ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Thermal Equilibrium ◽  
Reaction Rate ◽  
Low Cost ◽  
Hydrogen Gas ◽  
Metabolic Imaging ◽  
Reaction Conditions ◽  
Precursor Molecule ◽  
Solution Preparation

AbstractParahydrogen-induced polarization is a hyperpolarization method for enhancing nuclear magnetic resonance signals by chemical reactions/interactions involving the para spin isomer of hydrogen gas. This method has allowed for biomolecules to be hyperpolarized to such a level that they can be used for real time in vivo metabolic imaging. One particularly promising example is fumarate, which can be rapidly and efficiently hyperpolarized at low cost by hydrogenating an acetylene dicarboxylate precursor molecule using parahydrogen. The reaction is relatively slow compared to the timescale on which the hyperpolarization relaxes back to thermal equilibrium, and an undesirable 2nd hydrogenation step can convert the fumarate into succinate. To date, the hydrogenation chemistry has not been thoroughly investigated, so previous work has been inconsistent in the chosen reaction conditions in the search for ever-higher reaction rate and yield. In this work we investigate the solution preparation protocols and the reaction conditions on the rate and yield of fumarate formation. We report conditions to reproducibly yield over 100 mM fumarate on a short timescale, and discuss aspects of the protocol that hinder the formation of fumarate or lead to irreproducible results. We also provide experimental procedures and recommendations for performing reproducible kinetics experiments in which hydrogen gas is repeatedly bubbled into an aqueous solution, overcoming challenges related to the viscosity and surface tension of the water.

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