摘要
以纳米TiO2为载体用共沉淀法负载不同含量Au和ZnO,研究了在不同沉淀剂、焙烧温度和活化条件下制备的催化剂对富氢气体中CO转化率与选择性的影响。反应气采用模拟原料气,用微反-色谱联用装置对反应产物进行催化活性评价,用BET和XRD等方法对合成的催化剂进行表征。实验结果表明催化剂的活性与选择性受沉淀剂、焙烧温度、活化条件等制备因素综合影响。当催化剂组成为Au(2%)ZnO(2%)/TiO2,用尿素做沉淀剂、300℃空气焙烧,氢气条件下还原制备的催化剂在30℃时活性与选择性最佳。
The catalytic activity and selectivity of catalysts prepared by coprecipitation method with different precipitant. calcined temperature and the pretreatment condition with different content of Au and ZnO loading dispersed over nanoparticles TiO2 for CO oxidation in H2 -rich gas was studied. The simulated material gas was used as reaction gas and the evaluation on catalytic activity of product was made through microreaction- chromatograph instrument. The catalyst was characterized by XRD and BET. The results show that the activity and selectivity of the catalysts are greatly changed with the variation of the ZnO loading, the kind of precipitant, calcination temperature and pretreatment condition; the catalyst Au （2 % ）/ZnO（2 % ） TiOz with （NH2）2CO as the precipitants, calcined at 300℃, pretreatment in H2 and reaction temperature for 30℃ has optimal activity and selectivity.
出处
《石油化工高等学校学报》
CAS
2007年第1期63-66,共4页
Journal of Petrochemical Universities
