Document Type: Research Article
Professor of Organic Chemistry,
Department of Organic Chemistry, Faculty of Chemistry, College of Science, Tehran University, Tehran, IRAN
Hierarchical SAPO-34 molecular sieve has been synthesized with n-propylamine as meso scale template and used to prepare La-Hierarchical SAPO-34 by impregnation by Lanthanum nitrate and has been used in methanol to propylene conversion (MTP) process.
La-H-SAPO-34 demonstrated higher activity and selectivity for propylene (48.9%) compared to a conventional SAPO-34 catalyst (28.7%) in a fixed-bed reactor under atmospheric pressure at 450 oC and WHSV of 1.0 h-1. High selectivity and longer catalytic lifetime (7 hours) of methanol to propylene conversion has been attributed to the reduction in acidic character of active sites and the increasing mesopore volume. The catalyst has been characterized by XRD, FE-SEM, BET, NH3-TPD and TGA techniques and compared with SAPO-34.