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|Title:||Activated carbon supported Cu-Ni bimetallic catalyst for direct synthesis of DMC from CH3OH and CO2: Effect of pretreatment of Activated carbon supports||Authors:||Bian, J.
Carbon dioxide and dimethyl carbonate
|Issue Date:||Mar-2009||Citation:||Bian, J.,Xiao, M.,Wang, S.J.,Meng, Y.Z.,Lu, Y.X. (2009-03). Activated carbon supported Cu-Ni bimetallic catalyst for direct synthesis of DMC from CH3OH and CO2: Effect of pretreatment of Activated carbon supports. Research Journal of Chemistry and Environment 13 (1) : 66-80. ScholarBank@NUS Repository.||Abstract:||Activated carbon (AC) as catalyst support was treated with different oxidizing agents viz., HCl, HNO3, H2SO4 and HF. The effects of oxidative treatments on the physico-chemical properties of AC were thoroughly investigated using various characterization techniques. A series of Cu-Ni bimetallic catalysts supported on untreated and treated AC were prepared, characterized and tested for direct synthesis of dimethyl carbonate (DMC) from CH3OH and CO2 It was found that oxidative treatments significantly changed the surface chemical properties and pore structure of AC. A number of oxygen surface functional groups were introduced on the resulting AC during the oxidative treatments. These groups improved the hydrophilicity of AC, increased the adsorption capacity of Cu2+ and Ni2+, improved the interaction of activate metal with supports, which resulted in a more homogeneous distribution of Cu and Ni particles on the supports and consequently improved the catalytic performance of catalysts. These results could be closely correlated with the surface acidity. Catalytic activity tests for DMC synthesis revealed that the activity of prepared catalysts based on the treated AC supports was closely related to the surface characteristics of catalysts. The order of catalytic activity in both the conversion of CH3OH and the selectivity of DMC was as follows: AC- H2SO4 > AC-HF > AC-HNO3 > AC-HCl > AC. The key role of AC surface chemistry was examined to rationalize these findings and the relevant mechanistic and practical implications were discussed.||Source Title:||Research Journal of Chemistry and Environment||URI:||http://scholarbank.nus.edu.sg/handle/10635/93044||ISSN:||09720626|
|Appears in Collections:||Staff Publications|
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