Stabilizing copper species using zeolite for ethanol catalytic dehydrogenation to acetaldehyde

doi:10.1016/S1872-2067(19)63378-4

Abstract

Abstract: The selective dehydrogenation of ethanol to acetaldehyde is a promising route for acetaldehyde production. Although Cu-based catalysts exhibit high activity in ethanol dehydrogenation, a rapid deactivation due to Cu sintering always occurs. In this study, highly dispersed Cu species were stabilized using the silanol defects in Beta zeolite (denoted as Beta) resulting from dealumination, and applied as robust catalysts for ethanol-to-acetaldehyde conversion. Typically, a long catalyst lifetime of 100 h with an acetaldehyde yield of ~70% could be achieved over 5% Cu/Beta. The presence of Cu⁺ and Cu⁰ species and the agglomeration of Cu particles after a long-term reaction for 180 h were revealed by transmission electron microscopy, thermogravimetric analysis, and CO-diffuse-reflectance infrared Fourier transform spectroscopy, and were responsible for the deactivation of the Cu/Beta catalyst in the ethanol-to-acetaldehyde conversion.

Key words: Ethanol dehydrogenation, Acetaldehyde, Zeolite, Cu-based catalyst, Deactivation

Dongni Yu, Weili Dai, Guangjun Wu, Naijia Guan, Landong Li. Stabilizing copper species using zeolite for ethanol catalytic dehydrogenation to acetaldehyde[J]. Chinese Journal of Catalysis, 2019, 40(9): 1375-1384.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(19)63378-4

https://www.cjcatal.com/EN/Y2019/V40/I9/1375

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