Complex Catalysts for Direct Synthesis of Dimethyl Ether From Synthesis Gas. Part II. The Interaction of the Process Reactants and Products with the Catalyst Surfaces

Abstract

The mechanism of the Н2, СО, СО2, СН3ОН, (CH3)2O interaction with the surfaces of CuO/ZnO/Al2O3and γ-Al2O3was investigated using temperature-programmed desorption method with mass spectrometry detection. It was shown that desorption of the main process components takes place in the temperature range between 373 and 673 K, which corresponds to the temperature range for catalytic studies. Methanol dehydration takes place over the surface of γ-Al2O3catalyst with formation of dimethyl ether at Тmax= 553 К, which is the optimal temperature for synthesis of dimethyl ether from CO and H2over industrial catalysts with layered loadings. The desorption energies of the gases were calculated.