钡修饰Ir/SiO_2催化剂对氨分解促进作用的研究  

Study on the Decomposition of Ammonia by Ir/SiO_2 Catalyst with Barium Promoter

作　　者：倪平[1] 储伟[1] 罗仕忠[1] 王晓东[2] 张涛[2] 

机构地区：[1]四川大学化工学院,四川成都610065 [2]中国科学院大连化学物理研究所,辽宁大连116023

出　　处：《合成化学》2007年第4期407-411,416,共6页Chinese Journal of Synthetic Chemistry

基　　金：国家自然科学基金资助项目(205903603);中国科学院大连化学物理研究所和四川大学合作资助项目(03H458);国家教育部新世纪人才资助项目(NCET-05-783)

摘　　要：研究了浸渍法制备的Ba修饰S iO2担载型铱(Ir)基催化剂(Ba-Ir/S iO2)在氨催化分解模型反应的作用。结果表明Ba的添加显著提高了催化剂的活性和稳定性。采用H2-TPR和H2-TPD对Ba-Ir/SiO2进行分析和研究,结果显示助催化剂Ba和活性催化组分Ir之间发生了强相互作用。Ba-Ir/SiO2在氨催化分解模型反应中的主要活性物种是零价态的Ir。Novel Ir/SiOz catalysts with barium promoter Ba-Ir/Si0z were prepared and studied in ammonia decomposition. Ba-Ir/SiO2 exhibited a higher catalytic activity and a better stability than Ir/SiO2. The Ba-Ir/SiO2 were characterized by H2-TPR and H2-TPD. The addition of barium to silica supported Ir catalyst could improve the dispersion and restrain the sintering of active component. The active component of Ba-Ir/SiO2 in ammonia decomposition is iridium of zero valence.

关 键 词：氨分解 助剂 铱 钡 催化剂 

分 类 号：O614.81[理学—无机化学] O614.23[理学—化学]