University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Investigating the correlation between deactivation and the carbon deposited on the surface of Ni/Al2O3 and Ni/La2O3-Al2O3 catalysts during the biogas reforming reaction

Charisiou, N.D., Tzounis, L., Sebastian, V., Hinder, S.J., Baker, M.A., Polychronopoulou, K. and Goula, M.A. (2018) Investigating the correlation between deactivation and the carbon deposited on the surface of Ni/Al2O3 and Ni/La2O3-Al2O3 catalysts during the biogas reforming reaction Applied Surface Science.

[img] Text
Manuscript_Appl Surf Sci.doc - Accepted version Manuscript

Download (20MB)

Abstract

Ni/Al2O3 and Ni/La2O-Al2O3 catalysts were investigated for the biogas reforming reaction using CH4/CO2 mixtures with minimal dilution. Stability tests at various reaction temperatures were conducted and TGA/DTG, Raman, STEM-HAADF, HR-TEM, XPS techniques were used to characterize the spent samples. Graphitized carbon allotrope structures, carbon nanotubes (CNTs) and amorphous carbon were formed on all samples. Metallic Ni0 was recorded for all (XPS), whereas a strong peak corresponding to Ni2O3/NiAl2O4, was observed for the Ni/Al sample (650–750°C). Stability tests confirm that the Ni/LaAl catalyst deactivates at a more gradual rate and is more active and selective in comparison to the Ni/Al for all temperatures. The Ni/LaAl exhibits good durability in terms of conversion and selectivity, whereas the Ni/Al gradually loses its activity in CH4 and CO2 conversion, with a concomitant decrease of the H2 and CO yield. It can be concluded that doping Al2O3 with La2O3 stabilizes the catalyst by (a) maintaining the Ni0 phase during the reaction, due to higher dispersion and stronger active phase-support interactions, (b) leading to a less graphitic and more defective type of deposited carbon and (c) facilitating the deposited carbon gasification due to the enhanced CO2 adsorption on its increased surface basic sites.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Charisiou, N.D.
Tzounis, L.
Sebastian, V.
Hinder, S.J.S.Hinder@surrey.ac.uk
Baker, M.A.M.Baker@surrey.ac.uk
Polychronopoulou, K.
Goula, M.A.
Date : 23 May 2018
DOI : 10.1016/j.apsusc.2018.05.177
Copyright Disclaimer : © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords : Biogas reforming reaction; Syngas production; Nickel catalysts; Catalytic deactivation; Carbon nanotubes; Lanthana doping
Depositing User : Clive Harris
Date Deposited : 25 May 2018 09:34
Last Modified : 24 May 2019 02:08
URI: http://epubs.surrey.ac.uk/id/eprint/846521

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800