Preparation And Catalytic Hydrogenation Of Aromatics Performance Of Mesoporous Ruthenium-carbon With Semi-embedded Ru Nanoparticles

Carbon support catalysts with semi-embedded Ru particles has higher activity and stability in the hydrogenation reaction owing to their properties such as anti-sintering,anti-erosion and the strong interaction between the active component and the carbon support.The present paper reported the method of preparation of mesoporous ruthenium containing carbon(Ru-MC)catalyst with semi-embedded uniform Ru particles distribution via an in-situ carbonization strategy via impregnation/template method and grind/template method.Nitrogen adsorption-desorption,CO chemical adsorption,TPR-MS,XRD,TEM,SEM technique to characterize the different catalysts,which was evaluated in the hydrogenation of aromatics.The main results are as follows:1.Semi-embedded ruthenium catalyst(Ru-MC)was prepared with an in-situ carbonization strategy via impregnation/template method.The modified activated carbon was obtained through different liquid phase oxidation process which was applied to synthesis the Ru/AC catalysts.All of the catalysts were evaluated in the hydrogenation of aromatics to better understand how the supports affect the catalytic activity,among which the Ru-MC shows the best catalytic performance.It was confirmed that the amount of surface oxygen functional groups improved the catalytic activity of aromatics hydrogenation and the optimum ruthenium loading for Ru-MC catalysts is 2%.For different hydrogenation of aromatics,the amounts of substituent group in the aromatics lower the catalytic performance of the catalysts.2.Semi-embedded ruthenium catalyst(Ru-MC-g)was prepared with an in-situ carbonization strategy via grinding/template method,which is more simple and convenient compared with the impregnation/template method.As a contrast,the Ru-MC,Ru/MC,Ru/AC catalysts were prepared simultaneously.Both the Ru-MC-g and the Ru-MC showed the same catalytic performance in the hydrogenation of benzoic acid.The TOF value of Ru-MC-g with higher embedded degree is 2415 h-1 under reaction conditions of 4.0 MPa and 120 ?.It is the highest value owing to the lowest exposed ruthenium atoms in the surface of the catalysts which is 6 times higher than Ru/MC catalysts.3. N-doped mesoporous carbon support was obtained by adding different N-containing precursor which was applied to synthesis the Ru/MC-N catalysts by grinding/template method. With the increase of the amount of urea in the preparation process, the content of N in the MC support was also increased, mainly in the framework, first increased the activity of the catalyst and then decreased.