摘要
制备了CeO2修饰SiO2担载型铜铱基双金属催化剂,添加CeO2使Cu-Ir/SiO2催化剂在甲醇裂解模型反应中的初始活性和稳定性明显提高,反应10h后甲醇的转化率保持在96%以上,而Cu-Ir/SiO2催化剂反应10h后活性下降至39.1%.采用XPS,H2-TPR,XRD和TEM等手段对催化剂进行了结构分析,结果表明,铜和铱发生强相互作用,加入助剂CeO2可减少催化剂颗粒团聚.
The novel Cu-Ir bimetallic catalysts with ceria modified silica supported were prepared vta impregnation method for methanol decomposition. Cu-Ir/CeO2-SiO2 catalyst exhibited a higher catalytic activity and a better stability than Cu-Ir/SiOz catalyst. After 10 h of reaction, the methanol conversion was still over 96% with ceria modified Cu-Ir/SiO2 catalyst, while that of Cu-Ir/SiO2 catalyst decreased to 39.1%. The catalyst samples were characterized by XPS, H2-TPR, XRD and BET techniques. The addition of ceria to silica supported Cu-Ir catalyst could improve the dispersion and restrain the sintering of the active component.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第8期1507-1511,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金重大项目(批准号:20590360)
中国科学院大连化学物理研究所合作项目(批准号:03H458)资助.
关键词
双金属催化剂
甲醇裂解
CeO2助剂
铜和铱
表征
Bimetallic catalyst
Methanol decomposition
Ceria promoter
Cu-Ir
Characterization
