Title of Paper:Shape selective methylation of 4-methylbiphenyl with methanol over MgO/HZSM5

Hits:

Date of Publication:2003-01-01

Included Journals:Scopus

Volume:48

Issue:2

Page Number:902-903

Abstract:The effects of catalyst activation and the reaction conditions on the methylation of 4-methylbiphenyl (4-MBP) with methanol over MgO/CBV8020 were investigated. With an increase in the reaction temperature, the conversion of 4-MBP decreased and the selectivity to 4,4  -dimethylbiphenyl (4,4  -DMBP) first increased, then decreased. With an increase in the reaction temperature, the isomerization of 4-MBP into 3-MBP increased, as well as the isomerization of 4,4  -DMBP into 2,3  - and 3,4  -DMBP. The effect of reaction time on the methylation of 4-MBP with methanol showed that both the conversion of 4-MBP and the selectivity to 4,4  -DMBP decreased with reaction time. Moreover, the addition of water in the feed did not favor methylation of 4-MBP with methanol. With an increase in the amount of mesitylene, both the selectivity to 4,4  -DMBP and 4-MBP conversion increased a little. However, the activity stability improved a lot, after 375 min reaction, the selectivity to 4,4  -DMBP was    80%, and 4-MBP conversion was    8%.