Influences of doping and thermal stability on the catalytic performance of CuO/Ce20M1Ox (M = Zr, Cr, Mn, Fe, Co, Sn) catalysts for NO reduction by CO

RSC Advances ◽  
2016 ◽  
Vol 6 (114) ◽  
pp. 113630-113647 ◽  
Author(s):  
Changshun Deng ◽  
Junning Qian ◽  
Chuxuan Yu ◽  
Yunan Yi ◽  
Pan Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
No Reduction ◽  
Metal Cations ◽  
Catalytic Performance ◽  
Variable Valence ◽  
No Reduction By Co ◽  
Catalysts For No Reduction

The doping of variable valence metal cations into CeO2 is beneficial for catalytic NO reduction by CO.

Characterization and catalytic performance of Cu/CeO2 and Cu/MgO-CeO2 catalysts for NO reduction by CO

2009 ◽  
Vol 363 (1-2) ◽  
pp. 208-215 ◽  
Author(s):  
Jinfa Chen ◽  
Junjiang Zhu ◽  
Yingying Zhan ◽  
Xingyi Lin ◽  
Guohui Cai ◽  
...  
Keyword(s):  
No Reduction ◽  
Catalytic Performance ◽  
No Reduction By Co ◽  
Catalysts For No Reduction

Pd-xMo/Al2O3 Catalysts for NO Reduction by CO

1999 ◽  
Vol 185 (1) ◽  
pp. 138-151 ◽  
Author(s):  
Martin Schmal ◽  
M.A.S. Baldanza ◽  
M.Albert Vannice
Keyword(s):  
No Reduction ◽  
No Reduction By Co ◽  
Catalysts For No Reduction

Studies of sol–gel TiO2 and Pt/TiO2 catalysts for NO reduction by CO in an oxygen-rich condition

2004 ◽  
Vol 230 (1-4) ◽  
pp. 94-105 ◽  
Author(s):  
J.A Wang ◽  
A Cuan ◽  
J Salmones ◽  
N Nava ◽  
S Castillo ◽  
...  
Keyword(s):  
No Reduction ◽  
Sol Gel ◽  
No Reduction By Co ◽  
Rich Condition ◽  
Catalysts For No Reduction

Promotional Effect of Gadolinia on CuO Catalyst for Reduction of NO by Activated Carbon

2010 ◽  
Vol 132 ◽  
pp. 76-86
Author(s):  
Yu Ye Xue ◽  
Guan Zhong Lu ◽  
Yun Guo ◽  
Yang Long Guo ◽  
Yan Qin Wang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Active Sites ◽  
No Reduction ◽  
Catalytic Reduction ◽  
Catalytic Performance ◽  
Molar Ratio ◽  
Reduction Of No ◽  
Cooperative Effects ◽  
Promotional Effect ◽  
Catalysts For No Reduction

The Gd2O3 (gadolinia) modified CuO/AC catalysts for NO reduction by activated carbon were prepared and characterized by XRD, TPD-MS, EPR, XPS techniques. The results show that adding a small amount of Gd2O3 in the CuO catalyst can improve effectively its catalytic performance for NO reduction by activated carbon, and the appropriate molar ratio of Gd2O3/CuO is 0.03:1. The promotional effect of Gd2O3 stems from the cooperative effects between CuO and Gd2O3. The presence of Gd2O3 in the catalyst can alter the chemical state and environment of the CuO active sites and improve the catalytic activation of carbon by CuO to form more carbon reactive sites, resulting in the quicker transfer and release of oxygen decomposed from NO. The carboxylic groups on the surface of activated carbon play an important role in the catalytic reduction of NO by carbon at temperature below 300 °C.

Role of Structural Deficiency of Nanoscaled Perovskites Prepared by Reactive Grinding on the Catalytic Purification of Exhaust Pollutants

2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Runduo Zhang ◽  
Wei Yang ◽  
Jun Xue ◽  
Biaohua Chen
Keyword(s):  
Specific Surface ◽  
No Reduction ◽  
Soot Oxidation ◽  
Catalytic Performance ◽  
Surface Areas ◽  
No Reduction By Co ◽  
Cation Deficiency ◽  
Lanthanum Manganites ◽  
Calcination Step ◽  
Reactive Grinding

It is well known that the catalytic characteristics of perovskites for various redox reactions depend primarily on the preparation procedure. The conventional method for perovskite preparation, the so-called "ceramic method," involves a calcination step with a temperature of at least 800 oC, resulting in large grain size and low specific surface area (usually several m2/g). Recently, a new method for perovskite preparation designated as reactive grinding has been proposed by our group, generating a large variety of perovskites at room temperature with extraordinarily high specific surface areas on the order of 100 m2/g when grinding additives are used. Additionally, this novel technology is favorable to yield perovskites with an abundant deficiency structure simultaneously with a nanosized crystallite domain.Series of La(Co, Mn)1-x(Cu)xO3 perovskites were prepared by reactive grinding and characterized by XRD, O2-TPD, and H2-TPR showing anion deficiency (O2 vacancy) in lanthanum cobaltites and cation deficiency (O2 excess) in lanthanum manganites. These samples were thereafter used for catalytic purification of NO, CO and soot pollutants coming from an automobile. For NO reduction by CO, a better catalytic performance was found over LaCoO3 compared to LaMnO3. The deNOx activity of LaCoO3 can be considerably improved via 20% Cu substitution, leading to a 97% N2 yield and nearly complete CO conversion at 450 oC. This improvement was ascribed to the ease of generation of anion deficiencies after Cu incorporation, which plays a crucial role in NO adsorption and dissociation. A mechanism was proposed with dissociation of chemisorbed NO upon oxygen vacancies forming N2 and/or N2O, and oxidized perovskite surface, with continuous reduction by CO with the production of CO2. For soot combustion, the better activity was observed again in the case of LaCoO3 with respect to LaMnO3. A mechanism was proposed with an attack of soot by O- species which immigrates from the perovskite surface. Cation deficiency of lanthanum manganites associates with overstoichiometric oxygen from the perovskite lattice, which can be only utilized for an oxidation process but less active compared to molecular oxygen formed upon anion vacancies. In summary, the anion deficiency of perovskite-typed oxides seems to make more contribution for both NO reduction and soot oxidation in comparison with cation deficiency.

Catalytic Performance of NO Reduction by CO over Activated Semicoke Supported Fe/Co Catalysts

2016 ◽  
Vol 55 (50) ◽  
pp. 12710-12722 ◽  
Author(s):  
Xingxing Cheng ◽  
Luyuan Wang ◽  
Zhiqiang Wang ◽  
Mengze Zhang ◽  
Chunyuan Ma
Keyword(s):  
No Reduction ◽  
Catalytic Performance ◽  
Co Catalysts ◽  
No Reduction By Co
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