Size effect of Pt nanoparticles in acid-assisted soot oxidation in the presence of NO  

作　　者：Shuting Luo Xiaodong Wu Baofang Jin Shuang Liu Rui Ran Zhichun Si Duan Weng 

机构地区：[1]Key Laboratory of Advanced Materials of Ministry of Education,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [2]School of Materials Science and Engineering,Ocean University of China,Qingdao 266100,China [3]Graduate School at Shenzhen,Tsinghua University,Shenzhen 518055,China

出　　处：《Journal of Environmental Sciences》2020年第8期64-71,共8页环境科学学报（英文版）

基　　金：This work was supported by projects of the National Key R&D Program of China(No.2017YFC0211102);the Key Laboratory of Advanced Materials of the Ministry of Education.

摘　　要：Pt/Al2O3 catalysts with mean Pt particle size ranged from 2.7 to 7.1 nm were synthesized by chemical reduction method,and the sulfated counterparts were prepared by impregnation of sulfuric acid.The turnover frequency of platinum for soot oxidation under loose contact conditions in a feed flow containing NO and O2 are positively correlated with the size of platinum.The sulfated Pt/Al2O3 exhibits higher catalytic activity for soot oxidation in the presence of NO despite their reduced ability for NO2 production.Such a contradiction is more significant for those catalysts with smaller platinum particles.Herein,the catalysts were characterized by X-ray diffraction(XRD),Brunauer-Emmett-Teller(BET),transmission electron microscopy(TEM),inductive coupled plasma(ICP)emission spectrometry,CO chemisorption,thermogravimetric analysis(TGA),NH3 temperature-programmed desorption(NH 3-TPD),NO temperature-programmed oxidation(TPO)and NO x temperatureprogrammed desorption(TPD).Possible effect of Pt particle size for the catalytic oxidation of soot in the presence of NO was presented based primarily on the promoted NO2 transfer efficiency onto the soot pushed by the acidic catalysts.

关 键 词：PT/AL2O3 SULFATION Soot oxidation Particle size effect NO 2 transfer 

分 类 号：X701.2[环境科学与工程—环境工程]