Thesis (M.Eng.)--Chulalongkorn University, 2005

Titanium silicalite incorporated with various content of cobalt was synthesized by the hydrothermal method. The synthesized catalyst (Co-TS-1) were characterized by various techniques XRF, BET, XRD, FT-IR, SEM, XPS and NH[subscript 3]-TPD, to study the effects of cobalt on the formation of titanium silicalite crystal. The oxidation properties of Co-TS-1 catalysts were investigated by using the gas phase oxidation reaction of 2-propanol as the test reaction. The study reveals that the maximum amount of cobalt which can be incorporated into the TS-1 structure without any interference to the main TS-1 structure is about 0.38 mol%. The analysis by XPS reveals that the oxidation state of cobalt cation in the TS-1 framework is +2. In addition, the incorporation of cobalt increases the amount of the weak acid site while the amount of the strong acid site decreases. The Co-TS-1 catalysts exhibit higher catalytic activity for the dehydration reaction than theunmodified TS-1 was also found that the selectivity toward propylene of Co-TS-1 is also higher than that of the unmodified TS-1