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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
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2004 (English)In: Applied Catalysis A: General, ISSN 0926-860X, E-ISSN 1873-3875, Vol. 261, no 2, 183-189 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2004. Vol. 261, no 2, 183-189 p.
Keyword [en]
shape selectivity, 4-methylbiphenyl, methylation, HZSM-5, SiO2/Al2O3, MgO modification, hydrothermal treatment, shape-selective alkylation, polynuclear aromatics, specialty chemicals, mfi structure, naphthalene
Identifiers
URN: urn:nbn:se:kth:diva-23360ISI: 000221035800005OAI: oai:DiVA.org:kth-23360DiVA: diva2:342058
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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Sun, Licheng

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