Effects of ceria modification of H-mordenite on the shape-selective alkylation of biphenyl and naphthalene
The effects of the modification with ceria to H-mordenite (HM, SiO{sub 2}/Al{sub 2}O{sub 3} = 128) were investigated for the shape-selective alkylation of biphenyl and naphthalene. Such a large amount as 10--50 wt% of ceria-modification was revealed to be effective for the deactivation of external acid sites of HM. In the isopropylation of biphenyl (BP), the selectivity of 4,4{prime}-diisopropylbiphenyl (4,4{prime}-DIPB) kept high over Ce-modified HM even at a high reaction temperature at which temperature the selectivity fell down to quite low over unmodified HM. The effect was due to the prevention of the isomerization of 4,4{prime}-DIPB which occurred on the HM external acid site. The selectivity of 2,6-diisopropynaphthalene (2,6-DIPN) in the isopropylation of naphthalene (NP) was enhanced by the modification without significant decrease of catalytic activity: the highest selectivity for 2,6-DIPN was achieved up to 70% over HM with 30 wt% of cerium. The enhancement of the selectivities of 2,6-DIPN and 4,4{prime}-DIPB by ceria-modification is ascribed to the decrease of external acid sites to catalyze non-regioselective alkylation and the isomerization of products.
- Research Organization:
- National Inst. of Materials and Chemical Research, Ibaraki (JP)
- OSTI ID:
- 20082289
- Country of Publication:
- United States
- Language:
- English
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