The Effect Of Pore Structure And Surface Property Of Support On Ru Based Catalyst

The Ru-supported catalyst is broadly industrial applied, benefit by the development of preparation methods and characterization techniques. In the case of higher dispersion for the efficient use of catalytically active metal, a support with high surface area and a strong interaction between metal and support are required, which thrives the researches concentrated in the effect of pore structure and surface property of support.In this work, the effect of pore structure and surface property of support on Ru based catalyst is considered. The pore structure of the support is designed and tuned by the covered layer for the desired reaction. The surface property of catalyst is also varied by coating technique without affect the catalytic property of Ru atom. The interaction between metal and support of hydrogen spillover on Ru/SBA-15is investigated in detail. The results and conclusions are listed in the follow:(1)The pore size of SBA-15is tuned from3.8nm to9.4nm by adjusting the hydrothermal temperature, addition of other surfactant or swelling agent. But the change in the hydrophobic volume and the hydrophilic volume of surfactant micelles by adding CTAB is not available to get uniform pore.(2)The Ru particle size is determined by the texture property of support made by two-solvent method, not only the pore size, but also the specific surface. It is obviously that the selectivity of cyclohexene is Ru particle size-dependent during benzene hydrogenation.(3)A catalyst of graphite (or OMC) support Ru nanoparticles encapsulated by mSiO2layer is synthesized by a general strategy. The Ru nanoparticles are supported on high surface area graphite and under the bottom of the silica pore. The special structure enhances the terminal hydrogenation of cinnamaldehyde to unsaturated alcohol and turnover frequency, which is attributed to the geometric effect of the catalyst. The covered silica layer reverses the hydrophobic property of Ru-OMC to hydrophilic, and makes the catalyst homodisperse in water phase for efficient separation and recycling.(4)The hydrogen spillover on Ru/SBA-15is evidenced by in situ FTIR study. The defective tetrahedron silica on the surface of SBA-15plays a key role as an acceptor of the spilt-over hydrogen, forming Si-H bonds that can be unambiguously detected.The work will be useful for catalysts design and comprehension of support effect in heterogeneous catalysis.