Methylation of 4-methylbiphenyl with methanol over metal oxide-modified HZSM-5 zeolite catalysts
2003 (Chinese)In: Cuihuà xuébào, ISSN 0253-9837, Vol. 24, no 5, 333-337 p.Article in journal (Refereed) Published
A series of HZSM-5 zeolite catalysts modifed with metal oxides (MgO, CaO, SrO, BaO, ZnO, La2O3 and CeO2) were prepared by impregnation method and characterized by XRD, TPD and N-2-adsorption. Methylation of 4-methylbiphenyl (4-MBP) with methanol to 4,4'-dimethylbiphenyl (4,4'-DMBP) was carried out over the prepared catalysts under fixed-bed down-flow conditions. The results showed that the MgO-modified HZSM-5 can significantly improve the selectivity for target product 4,4'-DMBP (up to 80 % vs only 13 % over the parent HZSM-5). The effects of metal oxides on 4,4'-DMBP selectivity are arranged in the following order: MgO>SrOapproximate toZnOapproximate toCaOapproximate toLa(2)O(3)>BaO>CeO2. The effects of MgO contents, precursor-salt types, and loading methods were further investigated, and the results revealed that during 4-MBP conversion, proper MgO loading (5.6 %) can be more effective, and the ion-exchange methed is much better than the impregnation method. However, it is difficult to get higher metal oxide loading by using the ion-exchange method. The high selectivity over HZSM-5 modified with MgO largely results from the depression of 4,4-DMBP second reactions such as isomerization, dealkylation and alkylation, as demonstrated by the reaction of 4,4'-DMBP as reactant over MgO/ZSM-5 catalyst and HZSM-5 zeolite.
Place, publisher, year, edition, pages
2003. Vol. 24, no 5, 333-337 p.
4-methylbiphenyl, methanol, methylation, 4,4 '-dimethylbiphenyl, HZSM-5 zeolite, metal oxide, modification, shape-selective catalysis, shape-selective alkylation, naphthalene
IdentifiersURN: urn:nbn:se:kth:diva-22603ISI: 000183665900006OAI: oai:DiVA.org:kth-22603DiVA: diva2:341301
QC 201005252010-08-102010-08-10Bibliographically approved