摘要
采用浸渍法制备了低Pt含量的Pt/ZSM-5催化剂,并采用Fe,Co,N i,Cu,Zn等过渡金属元素对Pt/ZSM-5催化剂进行掺杂,考察了催化剂在四氯化碳(CTC)气相加氢脱氯反应中的催化性能。实验结果表明,掺杂Co可提高Pt/ZSM-5催化剂的初始催化活性(CTC初始转化率可达88%),而掺杂其它过渡金属元素难以提高CTC的转化率,但可改善催化剂的稳定性。400℃下用氢气活化可使失活催化剂再生。根据掺杂元素对产物分布的影响,探讨了Pt/ZSM-5催化剂催化CTC气相加氢脱氯的机理。
Vapor- phase hydrodechlorination of carbon tetrachloride（CTC） was investigated on Pt/ZSM- 5 catalyst with a low Pt content. The catalyst was prepared by impregnation and Pt mass fraction was 0.3%. Effect of doping transition metals, such as Fe, Co, Ni, Cu, Zn, on performances of Pt/ZSM - 5 catalysts was also studied. Co -Pt/ZSM -5 showed high initial catalytic activity with CTC conversion of 88%. Doping of Fe, Ni, Cu, Zn didn＇t increase catalytic activity of Pt/ZSM -5 catalyst, but improved its stability. Deactivated Pt/ZSM - 5 and Co - Pt/ZSM - 5 catalysts in CTC hydrodechlorination could be regenerated by treatment with H2 at 400℃. By investigating the effect of doping of different transition metals to Pt/ZSM - 5 catalysts on distribution of products, mechanism of CTC hydrodechlorination was deduced.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2005年第9期880-884,共5页
Petrochemical Technology
关键词
四氯化碳
气相催化
加氢脱氯
氯仿
四氯乙烯
铂/ZSM-5催化剂
carbon tetrachloride
vapor - phase catalysis
hydrodechlorination
chloroform
tetrachloroethylene
Pt/ZSM-5catalyst
