Citation: Chen Zhang, Xin Wen Guo, Ya Nan Wang, Xiang Sheng Wang, Chun Shan Song. Methylation of 2-methylnaphthalene with methanol to 2,6-dimethylnaphthalene over HZSM-5 modified by NH₄F and SrO[J]. Chinese Chemical Letters, ;2007, 18(10): 1281-1284. doi: 10.1016/j.cclet.2007.07.025 shu

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

a State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China;
b Clean Fuels and Catalysis Program, The Energy Institute and Department of Energy & Geo-Environmental Engineering, The Pennsylvania State University, 209 Academic Projects Building, University Park, PA 16802, USA

Received Date: 6 March 2007

Fund Project: The project was supported by Program for New Century Excellent Talents in University (no.NCET-04-0268) and by the 111 Project.

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.
- 2,6-DMN,
- Modification,
- Selectivity,
- ESP charge
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