CuZnAl@S-1 Catalyst for the Synthesis of Higher Alcohols by CO Hydrogenation

Abstract

catalysts were prepared using a solid-phase method to prepare silicate-1 molecular sieves with Cu, Zn, and Al components encapsulated in them, and their catalytic performance for CO hydrogenation was evaluated in a fixed-bed reaction. The structural and surface properties of the catalysts were characterized using X-ray diffraction, transmission electron microscopy, N 2 physisorption, and X-ray photoelectron spectroscopy and correlated with the catalytic performance. The results showed that the use of structurally simple S-1 immobilized CuZnAI nanoparticles (CZA@S-1) was effective in enhancing the conversion of ethanol, where C 2+ OH/ROH up to 50.63% and ROH selectivity up to 27.27% were achieved, and no deactivation was observed within six days. The characterization results indicate that the interaction between CuZn in the CZA@S-1 catalysts is stronger than that between CuAl and ZnAl, that the CuZn active component is able to supply electrons to the molecular sieve, and that the core−shell structure promotes the adsorption and dissociation of CO and enhances C−C coupling. In situ diffuse reflectance infrared Fourier transform spectroscopy measurements of the reaction intermediates for each catalyst inferred a pathway for C−C coupling to ethanol, which provides an alternative pathway to the CuZnAl conventional catalyst.

Nonenzymatic ethanol production in sustainable ways

“…62 In the following study, they also disclosed the crucial role of catalyst preparation methods in ethanol production, and further elevated the ethanol selectivity to >57% in ROH alcohols. 63–65 To further facilitate C–O bond scission and C–C coupling, the addition of transition metal/alkali–metal promoters is required for a higher ethanol selectivity. Typically, the productivity of C 2+ alcohols was doubled in the presence of a cesium (Cs) promoter due to the synergistic effect among Cs, Cu, and ZnO components for the C–C bond coupling between CHx and CHyO species.…”

Recent Advances and Perspectives in Catalyst Design for Converting Syngas to Higher Alcohols

“…Core−shell structured CuZnAl catalysts were also used for high alcohol synthesis. Wang and co-workers 124 prepared CuZnAl@S-1, ZnAl@S-1, CuZn@S-1, and CuAl@S-1 catalysts by a solid-phase method and investigated them for high alcohol synthesis. They found that CuZnAl nanoparticles encapsulated S-1 (CuZnAl@S-1) exhibited better catalytic performance, and the C 2+ OH/ROH and ROH selectivity reached 50.63% and 27.27%, respectively.…”