Abstract
The effects of reaction temperature on the selectivity for bulk products and for encapsulated products in the pores were investigated in the isopropylation of biphenyl over a highly dealuminated H-mordenite under 0.8 MPa of propylene. The selectivity for 4,4'-diisopropylbiphenyl (4,4'-DIPB) in bulk products was changed with the increase of reaction temperature: it decreased with increasing that for thermodynamically stable 3,3'- and 3,4'-DIPB. However, the selectivity for 4,4'-DIPB in encapsulated products was as high as 85–90% between 200 and 350oC. These results show that H-mordenite catalyzes the isopropylation of biphenyl inside the pore with high shape selectivity at these temperatures, and that the decrease of the selectivity for 4,4'-DIPB in the bulk products is due to its isomerization to 3,3'- and 3,4'-DIPB on external acid sites.
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