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HYDROGEN ADSORPTION ON ACTIVATED CARBON

HYDROGEN ADSORPTION ON ACTIVATED CARBON,X. B. Zhao,B. Xiao,A. J. Fletcher,K. M. Thomas

HYDROGEN ADSORPTION ON ACTIVATED CARBON  
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Experimental Carbon Samples used The PANC and G series of carbons used in this study were derived by heat treatment of oxidized carbon using nitric acid to provide a suite of carbons where the oxygen functional groups of various thermal stabilities were varied progressively by heat treatment. Carbon G is a commercially available coconut shell carbon supplied by Pica, Vierzon, France. The PANC carbon was made from polyacrylonitrile (PAN) powder. Carbon oxidation using nitric acid introduces various oxygen functional groups on the carbon surface. Carbons G209 and PANC were refluxed in HNO3 solution (7.5 M) for 48 hours to give oxidized carbons GOX and PANCOX. The product was filtered and washed before Soxhlet extraction with distilled water until the solution pH was constant. The carbon was dried at 383K. The samples were then heat treated at 3ºCmin -1 to the heat treatment temperature in helium and held at this temperature for 1h. The samples were designated with the code of the carbon and the heat treatment code e.g. PANCOX3 is sample PANCOX heat treated to 300ºC. Adsorption measurments An Intelligent Gravimetric Analyzer (I.G.A.) was used for adsorption kinetic studies. It was supplied by Hiden Analytical Ltd, UK. This apparatus is an ultra high vacuum system, which allows isotherms and the corresponding kinetics of adsorption and
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