Author : Chatchai Meephoka
Publisher :
ISBN 13 :
Total Pages : 242 pages
Book Rating : 4.:/5 (1 download)
Book Synopsis Effect of Phase Composition Between Gamma and Chi Alumina Supports on Oxygenative Reaction by : Chatchai Meephoka
Download or read book Effect of Phase Composition Between Gamma and Chi Alumina Supports on Oxygenative Reaction written by Chatchai Meephoka and published by . This book was released on 2008 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, the mixed-phase alumina supports were prepared by solvothermal method of a mixed solution of toluene and butan-1-ol and used as supports for Pt/Al2O3 and Ag/Al2O3 catalysts. Characterization results show that the BET surface areas of the gamma and chi alumina are similar but their acidities are different. The effect of phase composition on the catalysts properties was studied in various reactions, i.e., SCR of NO by propene under lean-burn condition, CO oxidation and selective CO oxidation in excess H2. For SCR of NO by propene under lean-burn codition, Ag/Al2O3 catalysts were investigated. The results show that 10% chi alumina catalysts yield the highest activity because of a large amount of Ag metal, which is the major active site for this reaction. For CO oxidation, Pt/Al2O3 catalysts were studied. The results show that the mixed-phase catalysts are more active than both pure gamma and chi alumina except for 10% chi alumina. The high activity is obtained due to high dispersion of platinum oxide on the support. Finally, for CO oxidation under excess H2, the Pt supported on chi alumina is more active than that on gamma alumina because of the weak adsorption of H2 and CO on chi alumina.