Influence of Catalyst Acid/Base Properties in Acrolein Production by Oxidative Coupling of Ethanol and Methanol

Oxidative coupling of methanol and ethanol represents a new route to produce acrolein. In this work, the overall reaction was decoupled in two steps, the oxidation and the aldolization, by using two consecutive reactors to investigate the role of the acid/base properties of silica‐supported oxide catalysts. The oxidation of a mixture of methanol and ethanol to formaldehyde and acetaldehyde was performed over a FeMoOx catalyst, and then the product mixture was transferred without intermediate separation to a second reactor, in which the aldol condensation and dehydration to acrolein were performed over the supported oxides. The impact of the acid/base properties on the selectivity towards acrolein was investigated under oxidizing conditions for the first time. The acid/base properties of the catalysts were investigated by NH3‐, SO2‐, and methanol‐adsorption microcalorimetry. A MgO/SiO2 catalyst was the most active in acrolein production owing to an appropriate ratio of basic to acidic sites. It′s all about the ratio: The focus of this work is to understand how the amount and strength of the acid/base sites influence the acrolein yield obtained by oxidative coupling of alcohols in the gas phase. The graphic shows the acrolein yield as a function of the basic/acidic sites ratio. A Mg/Si amphoteric catalyst with slightly dominant acidic character shows better catalytic performance than more basic catalysts.