文献类型：期刊文献

英文题名：Pt-Co-K Nanoparticles Supported on 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] Key Laboratory of Pressure Systems and Safety [MOE], School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230222549)

语种：英文

外文关键词：Alumina - Aluminum oxide - Ball milling - Catalyst activity - Cobalt - Hydrogen - Milling (machining) - Nanocatalysts - Oxidation - Platinum - Proton exchange membrane fuel cells (PEMFC) - Reaction intermediates - Ternary alloys

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 °C. With a GHSV of 40,000 ml g-1 h-1 at 120-160 °C, the 1.5K-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 PtCo/Al2O3 catalyst enhanced the PROX activity by facilitating water dehydrogenation which promoted the generation of surface hydroxyl groups. 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. ? 2023, The Authors. All rights reserved.