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Effects of SiO2/Al2O3, MgO modification and hydrothermal treatment on the catalytic activity of HZSM-5 zeolites in the methylation of 4-methylbiphenyl with methanol
- Guo, X. W. (author)
- Shen, J. P. (author)
- Sun, Licheng (author)
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- Song, C. S. (author)
- Wang, X. S. (author)
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- Elsevier BV, 2004
- 2004
- English.
- In: Applied Catalysis A. - : Elsevier BV. - 0926-860X .- 1873-3875. ; 261:2, s. 183-189
- Journal article (peer-reviewed)
Abstract
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- The objective of this work is to study the effects Of SiO2/Al2O3 of HZSM-5, MgO modification and hydrothermal treatment on methylation of 4-methylbiphenyl (4-MBP) with methanol under fixed-bed down-flow conditions. The results show that, with an increase in the SiO2/Al2O3 of HZSM-5 (from 50 to 150, molar ratio), the selectivity to 4,4'-dimethylbiphenyl (4,4'-DMBP) increases from 25 to 79%. MgO modification also increases the selectivity to 4,4'-DMBP, but leads as well to low catalyst activity and rapid deactivation. Hydrothermal treatment not only increases the selectivity, but also improves the stability. When CBV1502 (SiO2/Al2O3 = 150) catalyst was hydrothermally treated at 500degreesC, the selectivity to 4,4'-DMBP increased to 85%. The selectivity to 4,4'-DMBP was further improved to about 90% by the increasing in the amount of mesitylene in the feed as solvent.
Keyword
- shape selectivity
- 4-methylbiphenyl
- methylation
- HZSM-5
- SiO2/Al2O3
- MgO modification
- hydrothermal treatment
- shape-selective alkylation
- polynuclear aromatics
- specialty chemicals
- mfi structure
- naphthalene
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- ref (subject category)
- art (subject category)
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- Guo, X. W.
- Shen, J. P.
- Sun, Licheng
- Song, C. S.
- Wang, X. S.
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- Royal Institute of Technology
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