Positive effects of a halloysite-supported Cu/Co catalyst fabricated by a urea-driven deposition precipitation method on the CO-SCR reaction and SO2 poisoning

2021 ◽  
Author(s):  
Wei-Jing Li ◽  
Shu Tsai ◽  
Ming-Yen Wey
Keyword(s):  
Co Oxidation ◽  
Catalytic Reduction ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Halloysite Nanotube ◽  
Co Catalyst ◽  
Reduction Of No ◽  
Co Catalysts ◽  
Positive Effects ◽  
So2 Poisoning

Cu/Co catalysts were prepared on halloysite nanotube supports by a urea-driven deposition-precipitation method for CO oxidation and the selective catalytic reduction of NO (CO-SCR). First, the Cu/NH3 molar ratio was...

scholarly journals Resistance to SO2 poisoning of V2O5/TiO2-PILC catalyst for the selective catalytic reduction of NO by NH3

2016 ◽  
Vol 37 (6) ◽  
pp. 888-897 ◽  
Author(s):  
Simiao Zang ◽  
Guizhen Zhang ◽  
Wenge Qiu ◽  
Liyun Song ◽  
Ran Zhang ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
So2 Poisoning

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.

Nanosized Pt-Co Catalysts for the Preferential CO Oxidation

2006 ◽  
Vol 6 (11) ◽  
pp. 3567-3571 ◽  
Author(s):  
Eun-Yong Ko ◽  
Eun Duck Park ◽  
Kyung Won Seo ◽  
Hyun Chul Lee ◽  
Doohwan Lee ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Peak Shift ◽  
Molar Ratio ◽  
High Catalytic Activity ◽  
Preferential Co Oxidation ◽  
X Ray ◽  
Co Catalysts ◽  
Transmission Electron ◽  
Temperature Programmed

The preferential CO oxidation in the presence of excess hydrogen was studied over Pt-Co/γ-Al2O3. CO chemisorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray spectrometer (EDX) and temperature programmed reduction (TPR) were conducted to characterize active catalysts. The catalytic activity for CO oxidation and methanation at low temperatures increased with the amounts of cobalt in Pt-Co/γ-Al2O3. This accompanied the TPR peak shift to lower temperatures. The optimum molar ratio between Co and Pt was determined to be 10. The co-impregnated Pt-Co/γ-Al2O3 appeared to be superior to Pt/Co/γ-Al2O3 and Co/Pt/γ-Al2O3. The reductive pretreatment at high temperature such as 773 K increased the CO2 selectivity over a wide reaction temperature. The bimetallic phase of Pt-Co seems to give rise to high catalytic activity in selective oxidation of CO in H2-rich stream.

Selective catalytic reduction of NO with NH3 over novel iron–tungsten mixed oxide catalyst in a broad temperature range

2015 ◽  
Vol 5 (9) ◽  
pp. 4556-4564 ◽  
Author(s):  
Xiang Li ◽  
Junhua Li ◽  
Yue Peng ◽  
Tao Zhang ◽  
Shuai Liu ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Mixed Oxide ◽  
Oxide Catalyst ◽  
Catalytic Reduction ◽  
Precipitation Method ◽  
Reduction Of No ◽  
Molar Ratios ◽  
Scr Of No ◽  
Mixed Oxide Catalyst ◽  
Co Precipitation

A series of novel FeW(x) catalysts with different Fe/W molar ratios prepared by the co-precipitation method were investigated in the selective catalytic reduction (SCR) of NOx with NH3.

scholarly journals Copper doped ceria porous nanostructures towards a highly efficient bifunctional catalyst for carbon monoxide and nitric oxide elimination

2015 ◽  
Vol 6 (4) ◽  
pp. 2495-2500 ◽  
Author(s):  
Shanlong Li ◽  
Nengli Wang ◽  
Yonghai Yue ◽  
Guangsheng Wang ◽  
Zhao Zu ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Carbon Monoxide ◽  
Co Oxidation ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Bifunctional Catalyst ◽  
Catalytic Performance ◽  
Doped Ceria ◽  
Reduction Of No ◽  
Porous Nanomaterials

Cu2+ doped CeO2 porous nanomaterials were synthesized by calcining CeCu–MOF nanocrystals. They exhibited a superior bifunctional catalytic performance for CO oxidation and selective catalytic reduction of NO.

Low Temperature CO Oxidation over Cobalt Catalysts Supported on Mesoporous CeO2

2013 ◽  
Vol 643 ◽  
pp. 76-82 ◽  
Author(s):  
Jun Jie Tian ◽  
Wei Na ◽  
Hua Wang ◽  
Wen Gui Gao
Keyword(s):  
Crystal Structure ◽  
Co Oxidation ◽  
Mesoporous Structure ◽  
Cobalt Catalysts ◽  
Precipitation Method ◽  
Molar Ratio ◽  
N2 Adsorption ◽  
Adsorption And Desorption ◽  
Low Temperature Co Oxidation ◽  
Temperature Programmed

Mesoporous CeO2 was first synthesized by hydrothermal method, and then used to synthesize different content of (Co3O4)x/CeO2 (x was the molar ratio of Cu and Co) by deposition-precipitation method. The fresh and doped catalysts were characterized by X-ray diffraction (XRD), N2 adsorption and desorption, H2 temperature programmed reduction (H2-TPR) and O2 temperature programmed desorption (O2-TPD) to study the crystal structure, surface area, and the mechanism of CO oxidation. The results show that: In XRD pattems, the doped cobalt amounts of samples from x=20% to x=100% have Co3O4 crystal structure. The N2 adsorption and desorption indicated the samples were mesoporous structure. Compared with other samples, the better reducibility and activity oxygen species of (Co3O4)50%/CeO2 coincided with its better catalytic activity.

The Effects of SiO2 and CeO2 Addition on the Performances of MnOx/TiO2 Catalysts

2016 ◽  
Vol 69 (10) ◽  
pp. 1180
Author(s):  
Juhua Luo ◽  
Hongkai Mao ◽  
Xu Wang ◽  
Wei Yao
Keyword(s):  
Low Temperature ◽  
Pore Diameter ◽  
Catalytic Reduction ◽  
Pure Tio2 ◽  
Precipitation Method ◽  
Impregnation Method ◽  
Average Pore ◽  
Reduction Of No ◽  
No Conversion ◽  
Co Precipitation

A TiO2-SiO2 mixed oxide was obtained by a co-precipitation method. MnOx-CeO2/TiO2-SiO2 were prepared by an impregnation method and their activity towards the selective catalytic reduction of NO with NH3 at low temperature were evaluated. Compared with pure TiO2, TiO2-SiO2 exhibited an evidently larger surface area and pore volume, and a smaller average pore diameter with narrow distribution. The NO conversion of the MnOx/TiO2-SiO2 catalyst could be improved by the addition of an appropriate amount of CeO2 in the temperature range of 100–180°C. MnOx-CeO2/TiO2-SiO2 with 10 wt-% CeO2 showed the highest activity with 96 % NO conversion at 180°C.

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