Co改性Mo/HZSM-5催化剂上甲烷无氧芳构化反应研究  

Methane Dehydro-Aromatization over Cobalt Modified Mo/HZSM-5 Catalysts in the Absence of Oxygen

作　　者：田丙伦[1] 刘红梅[1] 舒玉瑛[1] 王林胜[1] 徐奕德[1] 

机构地区：[1]中国科学院大连化学物理研究所催化基础国家重点实验室,大连116023

出　　处：《分子催化》2000年第3期200-204,共5页Journal of Molecular Catalysis(China)

基　　金：国家重点基础研究发展规划项目!项目名称 :天然气;煤层气优化利用的催化基础 .项目编号 :G19990 2 2 4 0 0

摘　　要：甲烷无氧芳构化催化剂 Mo/HZSM- 5上担载第二组分 Co后 ,提高了催化剂的稳定性 ,但加快了催化剂上的积炭速率 ,且积炭速率随 Co添加量的增加而提高 .因而认为催化剂的失活速率与积炭速率并不成顺比关系 .研究认为 ,一方面 ,Co的添加增加了催化剂的脱氢能力 ,使更多的中间产物乙烯进一步脱氢转化成芳烃或积炭 ;另一方面 ,增加了催化剂的抗积炭能力 .并认为部分积炭可能对提高催化剂的稳定性起到一定的作用 .空速实验表明 ,在高空速下 ,催化剂上的积炭更易使催化剂失活 . Co的添加使催化剂在较高温度下也具有较好的稳定性 .The catalytic stability of Mo/HZSM 5 catalyst for methane dehydro aromatization can be greatly improved by the addition of cobalt as the second component. On the other hand, Co also improves the coke formation rate on the catalyst. It is suggested that the catalytic deactivation rate is not proportional to coke formation rate, which we commonly thought it to be. The addition of appropriate quantity of cobalt to the Mo/HZSM 5 catalyst results in the promotion of the catalytic dehydrogenation ability and the anti coking ability. The intermediate species, ethylene, can be further dehydrogenated to aromatics or coke. The coke on the catalyst may play a role in the dehydro aromatization process to enhance the catalytic stability. The Co Mo/HZSM 5 catalyst deactivates more rapidly at higher space velocity and has good catalytic stability even at a high temperature, such as 993 K.

关 键 词：甲烷 芳构化 Co-Mo/HZSM-5 催化剂 

分 类 号：O621.253[理学—有机化学] O643.36[理学—化学]