Catalytic Conversion of Methanol by Oxidative Dehydrogenation

Abstract

This study investigates the effects of addition of oxygen on the oxidative dehydrogenation (ODH) of methanol when a fluorotetrasilicic mica ion-exchanged with palladium (Pd 2+-TSM) was used as the catalyst. The reaction proceeded at a very low temperature in the presence of oxygen, and HCOOCH 3 was obtained at high selectivity. By calculating the equilibrium conversion, it has been shown that substantial ODH took place for HCOOCH 3 production. Consequently, this reaction would make dehydrogenation the dominant reaction at equilibrium. Not all the H dissociated from CH 3OH was converted to H 2O by oxidation. It has been shown that the H 2O was not produced from oxidative dehydrogenation by the direct reaction of CH 3OH and O 2 when an attempt was made to carry out oxidative dehydrogenation using an isotope oxygen trace method in the gas phase. Therefore, when CH 3OH was converted to CO 2 and dehydrogenated to HCOOCH 3, the C-O bonds were not dissociated.