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Abstract
Vapor-phase synthesis of isoprene from formaldehyde and isobutylene over CuSO4−MOx/SiO2 catalysts has been studied. The results show that CuSO4−MOx/SiO2 catalysts exhibit a good catalytic activity; especially when the metal oxides have appropriate basicity, is isoprene yield greatly enhanced. The results of product analysis indicate that there are side-reactions during isoprene production, which are isoprene hydrogenation, polymerization of isobutylene, copolymerization of isobutylene and isoprene, and reaction of C5 aldehyde and ketone formed during isoprene production. In addition, catalytic behavior of the catalysts and probable mechanism of side-reactions are discussed.
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