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Indexed by:期刊论文

Date of Publication:2010-10-01

Journal:CHINESE JOURNAL OF CHEMICAL ENGINEERING

Included Journals:SCIE、EI、ISTIC、Scopus

Volume:18

Issue:5

Page Number:742-749

ISSN No.:1004-9541

Key Words:2-methylnaphthalene; methylation; HZSM-5; 2,6-dimethylnaphthalene; NH4F/Pt/HZSM-5

Abstract:Shape-selective methylation of 2-methylnaphthalene (2-MN) was carried out over NH4F and Pt modified HZSM-5 (SiO2/Al2O3 = 83) catalysts in a fixed-bed down-flow reactor using methanol as methylating agent and 1,3,5-trimethylbenzene (1,3,5-TMB) as a solvent. Pt promoted HZSM-5 catalysts showed low concentration of coke-like polycondensed aromatics, NH4F modification decreased non-shape-selective acid sites. After Pt and NH4F co-modification, both conversion of 2-MN and selectivity to 2,6-DMN were improved. 6%NH4F/0.5%Pt/HZSM-5 catalyst exhibited 13.8% of 2-MN conversion with 6.2% of 2,6-DMN yield after 7 h time on stream (TOS), and 2,6-/2,7-DMN ratio of 1.7 after 10 h of TOS.