Engineering CuOx–ZrO2–CeO2 nanocatalysts with abundant surface Cu species and oxygen vacancies toward high catalytic performance in CO oxidation and 4-nitrophenol reduction

CrystEngComm ◽  
2020 ◽  
Vol 22 (23) ◽  
pp. 4005-4013 ◽  
Author(s):  
Baolin Liu ◽  
Yizhao Li ◽  
Shaojun Qing ◽  
Kun Wang ◽  
Jing Xie ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Oxygen Vacancies ◽  
Catalytic Performance ◽  
Solvent Free ◽  
Metal Species ◽  
Synthetic Strategy ◽  
Nitrophenol Reduction ◽  
Active Metal ◽  
Excellent Catalytic Performance

CuOx–ZrO2–CeO2 nanocrystalline catalysts were designed and synthesized by a solvent-free synthetic strategy, and exhibited excellent catalytic performance owing to the increased oxygen vacancies and better dispersed active metal species.

scholarly journals On the Effects of Doping on the Catalytic Performance of (La,Sr)CoO3. A DFT Study of CO Oxidation

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 312 ◽  
Author(s):  
Antonella Glisenti ◽  
Andrea Vittadini
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Density Functional Calculations ◽  
Density Functional ◽  
Formation Energy ◽  
Oxygen Vacancies ◽  
Catalytic Performance ◽  
Energy Profiles ◽  
High Concentrations ◽  
3D Impurities

The effects of modifying the composition of LaCoO3 on the catalytic activity are predicted by density functional calculations. Partially replacing La by Sr ions has benefical effects, causing a lowering of the formation energy of O vacancies. In contrast to that, doping at the Co site is less effective, as only 3d impurities heavier than Co are able to stabilize vacancies at high concentrations. The comparison of the energy profiles for CO oxidation of undoped and of Ni-, Cu-m and Zn-doped (La,Sr)CoO3(100) surface shows that Cu is most effective. However, the effects are less spectacular than in the SrTiO3 case, due to the different energetics for the formation of oxygen vacancies in the two hosts.

scholarly journals High Degradation of Trichloroethylene in Water by Nanostructured MeNPs@CALB Biohybrid Catalysts

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 753
Author(s):  
Noelia Losada-Garcia ◽  
Alba Rodriguez-Otero ◽  
Jose M. Palomo
Keyword(s):  
Room Temperature ◽  
Catalytic Performance ◽  
Metal Species ◽  
Cu2o Nanoparticles ◽  
Degradation Reaction ◽  
Tce Degradation ◽  
Nanoparticle Sizes ◽  
By Products ◽  
Excellent Catalytic Performance ◽  
Excellent Stability

In this study, a methodology was developed for the rapid degradation of trichloroethylene (TCE) and 1,1-dichloroethylene (1,1-DCE) in distilled water and room temperature without the production of toxic chlorinated by-products. This process was carried out using bionanohybrids of different metals (Pd, Fe, Cu and Zn) obtained by enzyme–metal coordination called MeNPs@CALB, which present different metal species and nanoparticle sizes. The Cu2O@CALB biohybrid, which contained Cu2O nanoparticles, showed excellent catalytic performance in TCE degradation by removing 95% (>125 ppm) in 10 min using 1.5 g/L of catalyst. On the other hand, in the degradation reaction of 1,1-DCE, Cu2O@CALB eliminated 94% (93 ppm) in 1 min. Cu2O@CALB exhibited excellent stability and recyclability under sustainable conditions, maintaining its effectiveness in more than 90% for three cycles.

Heterometallic {ZnEu}-metal–organic framework for efficient chemical fixation of CO2

2020 ◽  
Vol 49 (41) ◽  
pp. 14656-14664
Author(s):  
Hongxiao Lv ◽  
Hongtai Chen ◽  
Liming Fan ◽  
Xiutang Zhang
Keyword(s):  
Metal Organic Framework ◽  
Catalytic Performance ◽  
Chemical Fixation ◽  
Synthetic Strategy ◽  
Metal Organic ◽  
Honeycomb Material ◽  
Excellent Catalytic Performance ◽  
Organic Framework

A robust double-walled honeycomb material {[EuIIIZnII(HPTTBA)(H2O)]·4DMF·3H2O}n with excellent catalytic performance for the chemical fixation of CO2 was presented by utilizing a ligand-directed synthetic strategy.

Ball-milling synthesized hydrotalcite supported Cu–Mn mixed oxide under solvent-free conditions: an active catalyst for aerobic oxidative synthesis of 2-acylbenzothiazoles and quinoxalines

2018 ◽  
Vol 20 (20) ◽  
pp. 4638-4644 ◽  
Author(s):  
Xu Meng ◽  
Xiuru Bi ◽  
Chaoying Yu ◽  
Gexin Chen ◽  
Baohua Chen ◽  
...  
Keyword(s):  
Ball Milling ◽  
Mixed Oxide ◽  
Active Catalyst ◽  
Supported Catalyst ◽  
Catalytic Performance ◽  
Solvent Free ◽  
Solvent Free Conditions ◽  
Excellent Catalytic Performance

Ball-milling results in excellent catalytic performance of bimetallic supported catalyst Cu–Mn/HT.

scholarly journals Ruthenium Supported on Ionically Cross-linked Chitosan-Carrageenan Hybrid MnFe2O4 Catalysts for 4-Nitrophenol Reduction

Catalysts ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 254 ◽  
Author(s):  
Kin Hong Liew ◽  
Tian Khoon Lee ◽  
Mohd Ambar Yarmo ◽  
Kee Shyuan Loh ◽  
Andreia F. Peixoto ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Electrostatic Interactions ◽  
Catalytic Performance ◽  
Reduction Reaction ◽  
Ru Nanoparticles ◽  
Nitrophenol Reduction ◽  
Active Metal ◽  
Wide Range ◽  
Mnfe2o4 Nanoparticles ◽  
Superparamagnetic Properties

Herein, we report a facile procedure to synthesize the hybrid magnetic catalyst (Ru@CS-CR@Mn) using ruthenium (Ru) supported on ionically cross-linked chitosan-carrageenan (CS-CR) and manganese ferrite (MnFe2O4) nanoparticles with excellent catalytic activity. The ionic gelation of CS-CR is acting as a protecting layer to promote the encapsulation of MnFe2O4 and Ru nanoparticles by electrostatic interactions. The presence of an active metal and a CS-CR layer on the as-prepared Ru@CS-CR@Mn catalyst was well determined by a series of physicochemical analyses. Subsequently, the catalytic performances of the Ru@CS-CR@Mn catalysts were further examined in the 4-nitrophenol (4-NP) reduction reaction in the presence of sodium borohydride (reducing agent) at ambient temperature. The Ru@CS-CR@Mn catalyst performed excellent catalytic activity in the 4-NP reduction, with a turnover frequency (TOF) values of 925 h−1 and rate constant (k) of 0.078 s−1. It is worth to mentioning that the Ru@CS-CR@Mn catalyst can be recycled and reused up to at least ten consecutive cycles in the 4-NP reduction with consistency in catalytic performance. The Ru@CS-CR@Mn catalyst is particularly attractive as a catalyst due to its superior catalytic activity and superparamagnetic properties for easy separation. We foresee this catalyst having high potential to be extended in a wide range of chemistry applications.

Solvent-free oxidation of ethylbenzene over hierarchical flower-like core–shell structured Co-based mixed metal oxides with significantly enhanced catalytic performance

2015 ◽  
Vol 5 (1) ◽  
pp. 540-548 ◽  
Author(s):  
Renfeng Xie ◽  
Guoli Fan ◽  
Lan Yang ◽  
Feng Li
Keyword(s):  
Metal Oxides ◽  
Catalytic Performance ◽  
Solvent Free ◽  
Core Shell ◽  
Mixed Metal Oxides ◽  
Mixed Metal ◽  
Oxidation Of Ethylbenzene ◽  
Free Oxidation ◽  
Excellent Catalytic Performance

Hierarchical flower-like core–shell structured Co-based mixed metal oxides exhibited excellent catalytic performance in solvent-free oxidation of ethylbenzene.

scholarly journals Preparation and catalytic performance of active metal sintered membrane reactor anchored with Pt atoms

RSC Advances ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 2848-2853
Author(s):  
Xiaoliang Ren ◽  
Shufang Wang ◽  
Xiaoshu Ding ◽  
Dongsheng Zhang ◽  
Yanji Wang
Keyword(s):  
Liquid Phase ◽  
Membrane Reactor ◽  
Catalytic Performance ◽  
Nitroaromatic Compounds ◽  
Liquid Phase Hydrogenation ◽  
Active Metal ◽  
Excellent Catalytic Performance

A novel, active metal sintered membrane reactor anchored with Pt atoms was successfully developed. The membrane reactor exhibited excellent catalytic performance and stability towards continuous liquid-phase hydrogenation of nitroaromatic compounds.

scholarly journals Low temperature CO oxidation catalysed by flower-like Ni–Co–O: how physicochemical properties influence catalytic performance

RSC Advances ◽  
2018 ◽  
Vol 8 (13) ◽  
pp. 7110-7122 ◽  
Author(s):  
Yunan Yi ◽  
Pan Zhang ◽  
Zuzeng Qin ◽  
Chuxuan Yu ◽  
Wei Li ◽  
...  
Keyword(s):  
Low Temperature ◽  
Physicochemical Properties ◽  
Co Oxidation ◽  
Oxygen Vacancies ◽  
Catalytic Performance ◽  
Surface Oxygen ◽  
High Concentration ◽  
Highly Dispersed ◽  
Low Temperature Co Oxidation

The flower-like catalyst possesses highly dispersed amorphous NiO and a high concentration of surface oxygen vacancies which are the central points for CO oxidation.

Uniform Ni/SiO2@Au magnetic hollow microspheres: rational design and excellent catalytic performance in 4-nitrophenol reduction

Nanoscale ◽  
2014 ◽  
Vol 6 (12) ◽  
pp. 7025-7032 ◽  
Author(s):  
Shenghuan Zhang ◽  
Shili Gai ◽  
Fei He ◽  
Yunlu Dai ◽  
Peng Gao ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Catalytic Activity ◽  
Rational Design ◽  
Au Nanoparticles ◽  
Catalytic Performance ◽  
Hollow Microspheres ◽  
Nitrophenol Reduction ◽  
Excellent Catalytic Performance

Uniform Ni/SiO2 magnetic hollow microspheres were prepared by an in situ thermal decomposition and reduction route. Tiny Au nanoparticles (5 nm) were linked to Ni/SiO2 microspheres. The as-prepared Ni/SiO2@Au catalysts exhibited excellent catalytic activity for 4-nitrophenol reduction.

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