Production of Acetaldehyde via Oxidative Dehydrogenation of Ethanol over AgLi/SiO2 Catalysts

Narawich Mukda  -  Department of Chemical Engineering, Chulalongkorn University, Thailand
Chaowat Autthanit orcid scopus  -  Department of Chemical Engineering, Chulalongkorn University, Thailand
Piyasan Praserthdam scopus  -  Department of Chemical Engineering, Chulalongkorn University, Thailand
*Bunjerd Jongsomjit scopus  -  Department of Chemical Engineering, Chulalongkorn University, Thailand
Received: 15 Aug 2020; Revised: 17 Sep 2020; Accepted: 18 Sep 2020; Published: 28 Dec 2020; Available online: 19 Sep 2020.
Open Access Copyright (c) 2020 Bulletin of Chemical Reaction Engineering & Catalysis
License URL: http://creativecommons.org/licenses/by-sa/4.0

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Abstract

Three AgLi/SiO2 catalysts containing different types of silica supports [small particle size (SPS), medium particle size (MPS) and large particle size (LPS)] were prepared by incipient wetness co-impregnation techniques and tested in oxidative dehydrogenation of ethanol into acetaldehyde. The catalysts were characterized and evaluated by various characterization techniques (e.g. XRD, N2 physisorption, SEM-EDX, UV-Visible spectroscopy, H2-TPR, and CO2-TPD). This study reveals that the catalyst with the best performance is AgLi/SiO2-LPS with a yield in acetaldehyde of 76.8% at 300 °C. The results obtained with the tested catalysts are discussed, and the reasons of performance improvement caused by the presence of the dispersion of active components, the interaction between active components and silica supports, the textural properties of catalysts and reducibility, are raised. Besides, the cooperation of redox properties (Agnδ+  cluster and Ag0) and weak basic density played a pivotal role in promoting the formation of acetaldehyde from ethanol oxidative dehydrogenation. Copyright © 2020 BCREC Group. All rights reserved

 

Keywords: Oxidative dehydrogenation of ethanol; Silver-lithium; Silica; Acetaldehyde
Funding: Chulalongkorn University, CAT-REAC industrial project

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