Study On The Surface Properties Of Activated Carbon By Catalytic Kinetic Analysis Method

Activated carbon are widely used in many fields, such as extensive refinement of gas and liquid, decolorization from solvent, catalytic reaction and environment protection, etc. This is due to their large surface area, specific pore structure, and has very close relation to their special surface chemical structure, in particular, the structure of surface oxygen containing groups. The quantity and kinds of activated carbon surface oxygen containing groups, particularly, acidic oxygen containing groups are of great influence on activated surface catalytic properties, acid-base characters and adsorption behaviors.In this paper, the surface of commercial activated carbons were oxidized with concentrated nitric acid and hydrogen peroxide, and the surface chemical properties of these treated activated carbon were characterized by means of FTIR spectroscopy, thermal analysis. Results suggest that the amount of carboxylic groups and phenolic groups on activated carbon surface become higher after oxidization treatment, then the quantity of carboxylic groups was calculated according to the mass changes of activated carbon at different temperature ranges.In this study, the amount of acidic centers was determined by catalytic kinetic analysis method. We selected the addition reaction of 1,2-epoxyethybenzene and methanol catalyzed by benzoic acid or surface treated activated carbons as indicator reaction. The influence of catalyst type, catalyst amount, reaction time on conversion of 1,2-epoxyethybenzene was investigated, linear range of conversion of 1, 2-epoxyethybenzene was founded, and the quantity of acidic...