Effect of CeO_(2) nanoparticle sizes on catalytic performances of sulfated CeO_(2)/Al_(2)O_(3) catalyst in NH_(3)-SCR reaction  

作　　者：Zhenghua Hu Dongqi An Lei Zhang Xuping Wang Siyong Fang Xinyun Tian Liu Qiu Jingfang Sun Tingzhen Li Lin Dong 

机构地区：[1]School of Environmental and Chemical Engineering,Chongqing Three Gorges University,Chongqing,404000,China [2]Key Laboratory of Water Environment Evolution and Pollution Control in the Three Gorges Reservoir,Chongqing Three Gorges University,Chongqing,404000,China [3]Jiangsu Key Laboratory of Vehicle Emissions Control,Center of Modern Analysis,Nanjing University,Nanjing,210093,China

出　　处：《Journal of Rare Earths》2024年第3期515-522,I0004,共9页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(21607019);the Scientific and Technological Research Program of Chongqing Municipal Education Commission(KJQN202101242,KJQN202001227);the Open Project Program of Key Laboratory of Water Environment Evolution and Pollution Control in the Three Gorges Reservoir(WEPKL2019ZD-04)。

摘　　要：The sulfated CeO_(2)/Al_(2)O_(3) catalysts with different sizes of CeO_(2)nanoparticles were prepared by using pure H_2O or acetic acid solution as impregnation solvent, and the influence of sizes of CeO_(2) nanoparticles on the catalytic performances of the sulfated CeO_(2)/Al_(2)O_(3) catalyst was studied. The catalytic performance tests show that the sulfated CeO_(2)/Al_(2)O_(3) catalyst using acetic acid solution as impregnation solvent has better catalytic activity and the resistance to K+poisoning than the sulfated CeO_(2)/Al_(2)O_(3) catalyst using pure H_(2)O as impregnation solvent. The excellent catalytic performances can be ascribed to the smaller sizes of CeO_(2) nanoparticles in CeO_(2)/Al_(2)O_(3) catalyst using acetic acid solution, which results in larger amount of adsorbed sulfate species, surface acid sites, surface active oxygen species and excellent redox property. These features are helpful for improving the catalytic performances of sulfated CeO_(2)/Al_(2)O_(3) catalyst using smaller amount of CeO_(2) to cut the costs.

关 键 词：Cerium-based catalyst Nanoscale effect NH_(3)selective catalytic reaction Sulfation process Alkali metal poisoning Rare earths 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O643.36[理学—物理化学]