Methylation of 2-methylnaphthalene with methanol to 2,6-dimethylnaphthalene over HZSM-5 modified by NH4F and SrO

Chen Zhang, Xin Wen Guo, Ya Nan Wang, Xiang Sheng Wang, Chun Shan Song

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The methylation of 2-methylnaphthalene (2-MN) into 2,6-dimethylnaphthalene (2,6-DMN) was investigated over the solid acid catalysts. The results show that HZSM-5 modified by NH4F has better catalytic performance than parent HZSM-5 due to the decrease in the acidity. When NH4F/HZSM-5 is further modified by SrO, its catalytic activity decreases due to the decrease in the total acid amount and acidic strength. As a result, the comprehensive modification of NH4F and SrO leads to the increase in the 2,6-DMN selectivity (2,6-DMN to DMN), up to 64.8% when 2-MN conversion is 10%. We calculated the ESP charge by density functional theory and the results show that the 6-position in 2-MN has higher ESP charge value than 7-position. The formation of 2,6-DMN is favored energetically as compared to that for 2,7-DMN. This suggests during the alkylation of 2-MN inside the ZSM-5 channel, the formation of 2,6-DMN is favored electronically than that of 2,7-DMN. Hence, lowering the acidity of catalyst is a key factor to obtain high selectivity of 2,6-DMN.

Original languageEnglish (US)
Pages (from-to)1281-1284
Number of pages4
JournalChinese Chemical Letters
Volume18
Issue number10
DOIs
StatePublished - Oct 2007

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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