摘要
针对苯在Pd/γ-Al2O3催化剂上的催化降解过程,研究了预处理方式对Pd/γ-Al2O3催化活性的影响,考察了其稳定性,并与Pd-Pt/γ-Al2O3催化剂进行了比较。通过BET和XPS对不同预处理方式下的Pd/γ-Al2O3催化剂进行了表征。研究结果表明:预处理方式对于催化剂活性有明显影响,相比H2,反应气预处理也可以提高催化剂的催化性能,并使操作过程简化;与Pd-Pt/γ-Al2O3相比,Pd/γ-Al2O3同样具有良好的催化稳定性。当空速为3 000 h-1,催化降解反应持续120 h后,苯降解率仍维持在99.6%以上。
The benzene catalytic oxidation over Pd/γ-Al2O3 catalyst is carried out in this study. The effect of pretreatment methods on the catalytic activity of Pd/γ-A12O3 is investigated. The stability of Pd/γ-A12O3 is investigated and compared with Pd-Pt/γ-A12O3 catalyst. The Brunauer Emmett Teller （BET） surface area and X-ray photoelectron spectroscopy （XPS） analysis are used to characterize the Pd/γ-A12O3 catalyst with different pretreatment methods. The results indicate that the pretreatment methods of catalysts have a significant positive effect on benzene oxidation at a certain temperature. Compared with H2 , the reaction gas pretreatment can improve the catalytic performance and simplify operation. In comparison with Pd-Pt/γ-A12 O3 , Pd/γ-A12O3 also exhibited favorable catalytic stability even if the reaction time is up to 120 h at certain temperatures, and the benzene degradation maintained above 99. 6%.
出处
《现代化工》
CAS
CSCD
北大核心
2012年第6期43-46,48,共5页
Modern Chemical Industry
基金
国家自然科学基金资助(10475046)
