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Ni–ReO x bimetallic catalysts (Ni–ReO x /TiO 2 ) were prepared through a successive impregnation method, which is extremely active in furfural (FAL) hydrogenation to tetrahydrofurfuryl alcohol (THFOL) under mild reaction conditions. For instance, high FAL initial reaction rate (439.4 mmol/g -Ni /h) and THFOL formation rate (80.4 mmol/g -Ni /h) were achieved over Ni–5ReO x /TiO 2, which are 13.2 and 6.6 times higher than those of Ni/TiO 2, respectively. The unique catalyst reactivity derives from rich Lewis acidic ReO x and intimate electron interaction of ReO x with Ni NPs. Kinetic studies reveal that ReO x decoration decreases the activation barrier of −C═O hydrogenation other than the furan ring. Mechanism studies show that ReO x has a good affinity for C═O and H 2 and favors hydrogen spillover and C═O bond activation on Ni, thus reinforcing the synergistic effect of Ni and ReO x . This catalyst is versatile for various furan aldehydes and is relatively stable for 5 times recycling, showing relative potential for industrial application.
Lin et al. (Thu,) studied this question.