The effect of coating Ru particles
with a film of hydrophilic materials
on the tetra-phase partial hydrogenation of benzene to cyclohexene
was examined. By the sol–gel method, amorphous mesoporous TiO2, ZrO2, and SiO2 were coated on hexagonal
Ru particles, by which Ru@XO2 (X = Ti, Zr or Si) catalysts
were prepared. During the partial hydrogenation of benzene on Ru@XO2, the diffusion of benzene and cyclohexene dissolved in the
water phase onto Ru particles is suppressed by the presence of mesoporous
coating film. The diffusion of benzene is retarded further by the
hydrogen bonding with the structural OH groups contained in hydrophilic
materials. Because of the delicate diffusion behavior of benzene and
cyclohexene through coating film, a decreasing rate of benzene conversion
but a significantly increasing cyclohexene selectivity was observed
in the partial hydrogenation on different Ru@XO2 catalysts.
A maximum cyclohexene yield of 52.6 mol % occurs on Ru@TiO2 at the benzene conversion of 85.0%.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.