Effect of FSP-inserted Cu on Physicochemical Properties of Cu/Al2O3 Catalyst

Charuwan Poosri orcid  -  Department of Chemical Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Thailand
*Choowong Chaisuk  -  Department of Chemical Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Thailand
Wantana Klysubun  -  Synchrotron Light Research Institute, Thailand
Received: 18 Jun 2020; Revised: 7 Aug 2020; Accepted: 10 Aug 2020; Published: 28 Dec 2020; Available online: 26 Aug 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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The copper inserted on Cu/Al2O3 catalysts with various Cu loading (10-40 wt%) were synthesized via flame spray pyrolysis (FSP). These catalysts were characterized using X-ray diffraction (XRD), N2 physisorption, temperature programmed reduction (TPR) and X-ray absorption near edge spectroscopy (XANES). The XRD results confirmed the formation of copper aluminate spinel (CuAl2O4) on the FSP-inserted Cu catalyst. The CuO crystallite size of the Cu/Al2O3 catalysts was increased with increasing Cu loading during the flame spray pyrolysis step. The incorporation of copper and aluminum precursors during the flame spray pyrolysis step can inhibit the growth of Al2O3 particles resulting in higher BET surface area and smaller particle size than pure Al2O3 support. The data from TPR and XANES results can predict the ratio of CuO and CuAl2O4 in the FSP-made support. Less than 20 wt% loading of the FSP-inserted Cu showed high concentration of CuAl2O4 phase in the FSP-made material. The composition of CuO and CuAl2O4 phase can be controlled by varying Cu loading in flame spray pyrolysis step. This is a promising alternative way to synthesize the desired catalyst. An example was the catalytic testing of the selective hydrogenolysis of glycerol. The presence of both CuO and CuAl2O4 phases in the Cu/Al2O3 catalyst enhanced the catalytic activity and promoted the selectivity to acetol product. Copyright © 2020 BCREC Group. All rights reserved


Keywords: Flame spray pyrolysis (FSP); Cu/Al2O3; CuAl2O4 spinel; CuO/CuAl2O4 ratio
Funding: Silpakorn University

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