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Methylation of 4-me...
Methylation of 4-methylbiphenyl with methanol over metal oxide-modified HZSM-5 zeolite catalysts
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Guo, X. W. (author)
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Wang, X. S. (author)
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Shen, J. P. (author)
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Sun, Licheng (author)
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Song, C. S. (author)
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- 2003
- 2003
- Chinese.
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In: Cuihuà xuébào. - 0253-9837 .- 1872-2067. ; 24:5, s. 333-337
- Related links:
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https://urn.kb.se/re...
Abstract
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- 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.
Keyword
- 4-methylbiphenyl
- methanol
- methylation
- 4,4 '-dimethylbiphenyl
- HZSM-5 zeolite
- metal oxide
- modification
- shape-selective catalysis
- shape-selective alkylation
- naphthalene
Publication and Content Type
- ref (subject category)
- art (subject category)
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