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In-Situ Active Site Formation in Co Oxidation On Alumina

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For the development of automotive catalysts which may fit the condition of developing countries, catalytic activity of alumina for CO oxidation was studied. It was proposed that the carbon formed in-situ acted as an active site for CO oxidation. The carbon active site was also checked by methanol oxidation on alumina which showed temperature hysteresis during consecutive heating and cooling operations. Alkali-treated Alumina did not show any indication of the temperature hysteresis. The optimal temperature for maximum carbon depostion was confirmed by thermogravimetric analysis to be 450 - 500 C, which well explains the hysteresis. CeO2-Al2O3 showed remarkably higher activities for complete oxidation. It seems that alumina has reasonably satisfactory activity in total clean-up of exhaust gas.

Affiliations: 1: Chemical Engineering Department, De la Salle University, 2401 Taft Avenue, Manila, Philippines; 2: Department of Chemical Engineering, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo, 152, Japan


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