STUDY ON CATALYTIC PERFORMANCE OF HMCM-22 ZEOLITE FOR PROPYLENE OLIGOMERIZATION
The propylene oligomerization catalyzed by HMCM-22 zeolite was studied and compared with HZSM-5,HY,HMOR and Hβ zeolite.The relationship between pore structure,acid properties and propylene oligomerization performance of 5 kinds of zeolites were investigated by a series of physical characterization methods and propylene oligomerization evaluation.The results showed that the topological structure and acidity of HMCM-22 zeolite had significant effects on the activity,selectivity and stability of propylene oligomerization.HMCM-22 zeolite has multi-dimensional pore structure,moderate acidity,good product diffusion performance and excellent carbon accumulation resistance,and the activity and stability of propylene oligomerization reaction are the best.It was found that HMCM-22 zeolite with high acid content of B acid and total acid had high initial activity and was easy to produce high carbon number products,but the zeolite with low selectivity of C3n and moderate mesoporous ratio had better stability.The results of stability evaluation of HMCM-22 zeolite showed that the conversion rate of propylene was over 85％and the selectivity of C3n reached 77.6％within 300 h,which indicated excellent propylene oligomerization activity,selectivity and stability.
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