燃料化学学报（中英文）2025，Vol.53Issue(1)：96-105,10.DOI:10.1016/S1872-5813(24)60466-4
γ-Al2O3形貌调控对PtCo合金化程度在CO-PROX反应中的影响
Tuning support morphology to control alloy over PtCo/γ-Al2O3 for the preferential oxidation of CO
摘要
Abstract
The preferential oxidation of CO(CO-PROX)reaction is a cost-effective method for eliminating trace amounts of CO from the fuel H2.Pt-based catalysts have been extensively studied for CO-PROX,with their activity influenced by the morphology of the support.Hydrothermal synthesis was employed to produce different morphologies of γ-Al2O3:flower-like γ-Al2O3(f)exposing(110)crystal faces,sheet-like γ-Al2O3(s)revealing(100)crystal faces,and rod-like γ-Al2O3(r)displaying(111)crystal faces,followed by loading PtCo nanoparticles.The exposed crystal faces of the support impact the alloying degree of the PtCo nanoparticles,and an increase in the alloying degree correlates with enhanced catalyst reactivity.Pt3Co intermetallic compounds were identified on γ-Al2O3(f)exposing(110)crystal faces,and PtCo/γ-Al2O3(f)showed high catalytic activity in the CO-PROX reaction,achieving 100%CO conversion across a broad temperature range of 50-225℃.In contrast,only partial alloying of PtCo was observed on γ-Al2O3(s).Furthermore,no alloying between Pt and Co occurred in PtCo/γ-Al2O3(r),resulting in a reaction rate at 50℃ that was merely 11%of that of PtCo/γ-Al2O3(f).The formation of Pt3Co intermetallic compounds led to a more oxidized state of Pt,which significantly diminished the adsorption of CO on Pt and augmented the active oxygen species,thereby facilitating the selective oxidation of CO.关键词
PtCo催化剂/γ-Al2O3/载体形貌/CO优先氧化Key words
PtCo catalysts/γ-Al2O3/support morphology/CO-PROX分类
化学化工引用本文复制引用
宋丽川,钟栎锭,沈佳,娄亚珂,郭耘,王丽..γ-Al2O3形貌调控对PtCo合金化程度在CO-PROX反应中的影响[J].燃料化学学报（中英文）,2025,53(1):96-105,10.基金项目
The project was supported by the National Natural Science Foundation of China(22376063,21976057),the Fund of the National Engineering Laboratory for Mobile Source Emission Control Technology(NELMS2020A05)and Fundamental Research Funds for the Central Universities. （22376063,21976057）
