Supported TiO 2–Pd bifunctional catalysts for the one-pot synthesis of methyl isobutyl ketone from acetone: modulation of the acid and base property of loaded TiO 2 by support

摘要

In this work, we prepared a series of supported TiO~(2)–Pd bifunctional catalysts for one-pot synthesis of methyl isobutyl ketone (MIBK) from acetone. The effects of supports including SiO~(2)with different pore structure, Al~(2)O~(3)calcined at varied temperature, and F-modification on the catalytic performance were investigated. The results showed that microporous SiO~(2)was not beneficial to the dispersion of TiO~(2)inspite its high specific surface area. The calcination of Al~(2)O~(3)had little effect on the acid and base property of TiO~(2)loaded thereon. F-modification of support was proved to be an effective way to modulate the acid and base property of TiO~(2)loaded thereon. As for the catalytic performance, TiO~(2)loaded on the F-modified mesoporous SiO~(2)showed the performance 60.9% MIBK yield, with acetone conversion of 77.2% and MIBK selectivity of 78.9%, higher than those ever reported. The excellent performance could be attributed to the enhanced electronic transfer between TiO~(2)and SiO~(2)after F modification which greatly affected the acid and base property of loaded TiO~(2). Taking the advantages of facile synthesis and high performance, the as-reported TiO~(2)/SiO~(2)(B-F)&Pd/Cor catalyst could be a promising alternative for one-pot synthesis of MIBK from acetone.