文献类型：期刊文献

英文题名：K-PtCo/Al2O3 via ball milling as an efficient catalyst for preferential oxidation of CO towards hydrogen purification

作者：Yao, Xinqi[1];Wang, Lei[1];Li, Chuandong[1];Yuan, Shuaishuai[1];Yu, Xinhai[1];Tian, Pengfei[1];Tu, Shan-tung[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety MOE, Shanghai 200237, Peoples R China

年份：2023

卷号：477

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20234615058932);WOS:【SCI-EXPANDED(收录号:WOS:001111941100001)】；

基金：This study was financially supported by China Natural Science Foundation (Contract Nos. 21476073, 21176069 and 21878078) .

语种：英文

外文关键词：Preferential oxidation of CO; K-PtCo/Al2O3 catalyst; Potassium; Intermediate; DFT

摘要：Preferential oxidation of CO (PROX) is an effective process to cleanup CO in hydrogen for proton exchange membrane fuel cells (PEMFCs). Prevailing catalysts face challenges, such as a high outlet CO concentration, a narrow operation temperature window, and a poor stability. To tackle these challenges, in this study, a potassium-promoted PtCo/Al2O3 catalyst with low metal loading was fabricated using a ball milling process. The addition of appropriate amount of potassium was found to be compelling in strengthening the catalytic activity at 100-240 degrees C. With a GHSV of 40,000 ml g(-1)h(-1) at 120-160 degrees C, the 1.5 K-0.5Pt1Co/Al2O3 (0.5 wt% Pt loading) can reduce CO from 1 % to less than 2 ppm while maintaining good stability for a long period. The addition of potassium to PtCo/Al2O3 enhanced the PROX activity by facilitating carboxyl dehydrogenation. The carboxyl pathway was found to be more facile on K2O/Pt3Co (111), resulting in the superior catalytic abilities of potassium-modified PtCo/Al2O3 catalysts.