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Understanding the role of Ni-Sn interaction to design highly effective CO2 conversion catalysts for dry reforming of methane

Guharoy, Utsab, Le Saché, Estelle, Cai, Qiong, Ramirez Reina, Tomas and Gu, Sai (2018) Understanding the role of Ni-Sn interaction to design highly effective CO2 conversion catalysts for dry reforming of methane Journal of CO2 Utilization, 27. pp. 1-10.

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Abstract

CO2 reforming of methane is an effective route for carbon dioxide recycling to valuable syngas. However conventional catalysts based on Ni fail to overcome the stability requisites in terms of resistance to coking and sintering. In this scenario, the use of Sn as promoter of Ni leads to more powerful bimetallic catalysts with enhanced stability which could result in a viable implementation of the reforming technology at commercial scale. This paper uses a combined computational (DFT) and experimental approach, to address the fundamental aspects of mitigation of coke formation on the catalyst’s surface during dry reforming of methane (DRM). The DFT calculation provides fundamental insights into the DRM mechanism over the mono and bimetallic periodic model surfaces. Such information is then used to guide the design of real powder catalysts. The behaviour of the real catalysts mirrors the trends predicted by DFT. Overall the bimetallic catalysts are superior to the monometallic one in terms of long-term stability and carbon tolerance. In particular, low Sn concentration on Ni surface effectively mitigate carbon formation without compromising the CO2 conversion and the syngas production thus leading to excellent DRM catalysts. The bimetallic systems also presents higher selectivity towards syngas as reflected by both DFT and experimental data. However, Sn loading has to be carefully optimized since a relatively high amount of Sn can severely deter the catalytic performance.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Guharoy, Utsabu.guharoy@surrey.ac.uk
Le Saché, Estellee.lesache@surrey.ac.uk
Cai, Qiongq.cai@surrey.ac.uk
Ramirez Reina, Tomast.ramirezreina@surrey.ac.uk
Gu, Saisai.gu@surrey.ac.uk
Date : 4 July 2018
Funders : Engineering and Physical Sciences Research Council (EPSRC)
DOI : 10.1016/j.jcou.2018.06.024
Copyright Disclaimer : © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).
Uncontrolled Keywords : Bimetallic catalyst; Surface alloy; Ni-Sn surface model; DFT calculations; DRM
Depositing User : Clive Harris
Date Deposited : 05 Jul 2018 09:13
Last Modified : 11 Dec 2018 11:24
URI: http://epubs.surrey.ac.uk/id/eprint/848659

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