Impact of Nonzeolite-Catalyzed Formation of Formaldehyde on the Methanol-to-Hydrocarbons Conversion

Formaldehyde is an important intermediate that affects the catalyst performance in methanol-to-hydrocarbons (MTH) conversion. In this study, photoelectron photoion coincidence spectroscopy was applied to elucidate formation of species empty quartz and stainless steel reactors as well over zeolite catalysts (ZSM-5 BETA) commonly used bed diluents (silicon carbide quartz). The yields formaldehyde reactor crude silicon particles were found be higher or comparable those under similar reaction conditions. former two systems, formed via methanol dehydrogenation, which catalyzed by transition metals hydrogen carbon monoxide main byproducts. Thus produced readily consumed MTH reaction, wherein its conversion for more acidic zeolites. generated metal sites causes a decrease stability reduction propene-to-ethene ratio, corroborated catalytic tests exploring different contacting patterns between ZSM-5 chips particles. These results uncover role dehydrogenation conversion, relevant laboratory testing industrial implementation technology.