摘要
通过并流共沉淀法制备了Au/α-Fe2O3催化剂,考察了金负载量及焙烧温度对Au/α-Fe2O3催化剂的物化结构及其选择性氧化富氢气体中CO催化性能的影响.研究结果表明,金负载量和焙烧温度对催化剂的性能均有较大影响,金负载量为1.5%(wt),低温焙烧(200～400℃)时制得的Au/α-Fe2O3催化剂对CO选择性氧化反应具有很好的催化活性和选择性,其中金负载量为1.5%(wt)、300℃焙烧的Au/α-Fe2O3催化剂,在40℃时对富氢气体中CO的转化率达到100%,选择性为 66%,该催化剂连续反应120h催化活性没有明显下降.XRD、BET和TEM分析结果表明,催化剂的性能与单质Au的粒径有关,粒径越小,催化活性越高.
Au supported catalysts has been proposed as a promising candidate system for CO removing from reformed gas via selective oxidation. The performance of Au/α-Fe2O3 catalysts prepared by co-current coprecipitation method was investigated. The results show that the activity of the catalysts is greatly changed with the variation of the Au loading and calcination temperature. The catalysts of 1.5%(wt) Au/α-Fe2O3 calcined at low temperatures (200-400°C) displayed high activity and selectivity. The CO conversion of 100% and selectivity of 66% were obtained for the catalyst calcined at 300°C. The catalyst sample showed good stability for 120 h. XRD, BET and TEM results indicated that the catalytic performance of Au/α-Fe2O3 catalyst was increased with decreasing the particle size of metallic gold.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2004年第5期606-610,共5页
Journal of Chemical Engineering of Chinese Universities
