XU San-kui^1,2, WANG Xiao-dong¹ , LI Li-min^*1 , LI Rui¹, Su Yun-lai¹

(1 Department of Chemistry, Zhengzhou University, Zhengzhou 450052, China 2.College of  Material Engineering , Henan University of Technology, Zhengzhou 450007,China )

Abstract: Activated carbon was modified by supercritical fluidic methanol in order to obtain materials with different surface properties. Several techniques were used to characterize the activated carbon and Ru/ AC catalysts including N₂ physisorption, Boehm titration ,XPS ,SEM,TEM and TPR. The results showed that supercritical fluid treatment did not remarkably change the surface structure of the activated carbon, but resulted in considerable decrease of the surface acidic groups, which led to higher dispersion of Ru, enhanced interaction force between activated carbon and Ru, increase of the reduced temperature and the binding energy of Ru , and enhanced activity of the catalysts prepared by impregnation of AC supported with RuCl₃ solution. The activities of Ru/ AC catalysts for hydrogenation of glucose were tested under 4.0Mpa at the temperature of 120°C.The results showed that activities of Ru/ AC catalysts prepared by supercritical fluid treatment were greatly increased. The optimal condition for the supercritical fluidic methanol was temperature 300°C for over 12h; the highest reaction rate for hydrogenation of glucose reached 118.65 mmol·min^-1g^-1Ru ,which exhibited 1.96 times higher than without treatment.

Key words: supercritical fluid; activated carbon; ruthenium catalyst ; surface group; glucosehydrogenation

E-mail: lilm@zzu.edu.cn

Journal of Molecular Catalysis, Vol. 24, Issue 6, 2010, 516~522