Cheng, F, Dupont, VAL orcid.org/0000-0002-3750-0266 and Twigg, MV (2016) Temperature-programmed reduction of nickel steam reforming catalyst with glucose. Applied Catalysis A: General, 527. pp. 1-8. ISSN 0926-860X
Abstract
Temperature-programmed reduction (TPR) of a NiO/α-Al2O3 steam reforming catalyst with glucose under a N2 flow was investigated using TGA-FTIR technique. A series of catalyst samples obtained at different temperatures during the TPR were characterised by XRD, CHN elemental analysis, SEM-EDX and TPO. Results showed that the whole TPR covering from room temperature to 900 °C consisted of two reactive processes. They were glucose pyrolysis producing carbonaceous materials (char), and NiO reduction by the char resulting in CO2 as a main product. When the initial mass ratio of glucose to the catalyst was 1:10, the catalyst could be completely reduced without carbon remaining. Moreover, two mass loss peaks were observed at around 440 °C and 670 °C, respectively, during the reduction. Based on the experiments of char characterisation, H2 TPR and excess glucose TPR, a two-stage reduction mechanism was proposed. The first reduction stage was attributed to a solid reaction between NiO and char. The second stage was assigned to NiO being reduced by the CO produced by char gasification with CO2. Their apparent activation energies were 197 ± 19 kJ/mol and 316 ± 17 kJ/mol, respectively, estimated using the Kissinger method.
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Copyright, Publisher and Additional Information: | © 2016, The Authors. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ | ||||
Keywords: | nickel oxide; reforming catalyst; glucose char; reduction; TGA-FTIR | ||||
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Institution: | The University of Leeds | ||||
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) | ||||
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Depositing User: | Symplectic Publications | ||||
Date Deposited: | 17 Aug 2016 09:12 | ||||
Last Modified: | 21 Oct 2017 04:30 | ||||
Published Version: | http://dx.doi.org/10.1016/j.apcata.2016.08.013 | ||||
Status: | Published | ||||
Publisher: | Elsevier | ||||
Identification Number: | https://doi.org/10.1016/j.apcata.2016.08.013 | ||||
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