通过沉积沉淀法制备了Ni负载型莫来石催化剂，并催化降解高密度聚乙烯制甲烷。利用XRF、XRD、SEM及GC等手段对催化剂组成、结构和形貌进行了研究。利用微型固定床石英管反应器考察了不同负载金属、金属负载量、反应温度、催化剂与反应物不同质量比条件下的催化剂对高密度聚乙烯分解反应性能的影响。结果表明，通过沉积沉淀法合成的Ni莫来石负载型催化剂对高密度聚乙烯有着较好的降解效果。随着金属负载量增大，甲烷选择性增高。当反应温度为775 K、Ni-莫来石与HDPE质量比为1：2时，气体转化率为15%，甲烷选择性为92.98%。

Ni-supported mullite catalyst is prepared by sedimentation precipitation method and is used to catalyze the degradation of high density polyethylene (HDPE) to produce methane.The composition,structure and morphology of the catalyst are studied by means of XRF,XRD,SEM and GC.The degradation of HDPE is conducted over the catalysts with various loading metals,loading amounts of metal,reaction temperatures and mixing ratios of catalyst to HDPE in a fixed bed reactor.The results show that the Ni-supported mullite catalyst synthesized by sedimentation precipitation method has the best effect on degradation of HDPE.The selectivity of methane increases as the loading amount of metal increases.Gas yield can reach 15% and the selectivity of methane can achieve 92.98% when the reaction temperature is at 775 K and the mass ratio of Ni-supported mullite to HDPE is 1:2.

王经明(1994-),男,硕士研究生,研究方向为高密度聚乙烯分解研究,397020259@qq.com