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
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
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.
shape selectivity, 4-methylbiphenyl, methylation, HZSM-5, SiO2/Al2O3, MgO modification, hydrothermal treatment, shape-selective alkylation, polynuclear aromatics, specialty chemicals, mfi structure, naphthalene
IdentifiersURN: urn:nbn:se:kth:diva-23360ISI: 000221035800005OAI: oai:DiVA.org:kth-23360DiVA: diva2:342058
QC 201005252010-08-102010-08-10Bibliographically approved