Hydrogenation Of Unsaturated Compounds Over Ruthenium Based Catalysts In Aqueous Media

Water is not only safe,cheap and environmental friendly, but also play important roles in chemical industry. Since 1980s, scientists found that water could enhance some reactions'rates, elicit new selectivities, and water-soluble catalysts could be reused after easy separation from the water-insoluble products in aqueous/organic system. This paper studied the selective hydrogenation of benzene to cyclohexene, preparation of chain-like Ru nanoparticle arrays and its application in fast hydrogenation of unsaturated compounds in aqueous media. In this paper, supported ruthenium nanoparticle catalysts and supported amorphous Ru-B catalysts were used in selective hydrogenation of benzene to cyclohexene. Supported amorphous catalysts H-204 showed high selectivity to cyclohexene. When benzene conversion was 40%, the selectivity of cyclohexene reached 77% and the TOF value was 315 h^-1.Chain-like Ru nanoparticle arrays, 1-3 nm in diameter and ²80 nm in length, had been successfully synthesized through polymer-mediated aqueous-solution method. The morphology of these Ru nanoparticle arrays could be varied from long chain-like arrays to cross-linked arrays by adjusting the reaction conditions including the average molecular weight of PVP, the mole ratio of repeat unit of PVP to Ru and concentration of hydrogen in solution. The obtained chain-like Ru nanoparticle arrays showed high activity in catalytic hydrogenation of phenol with broad concentration ranging from 10 mg/l to 10,000 mg/l at 353 K, under 1 MPa...