Zhang, Y, Tao, Y, Huang, J et al. (1 more author) (2017) Influence of silica–alumina support ratio on H₂ production and catalyst carbon deposition from the Ni-catalytic pyrolysis/reforming of waste tyres. Waste Management & Research, 35 (10). pp. 1045-1054. ISSN 0734-242X
Abstract
The influence of catalyst support alumina–silica in terms of different Al₂O₃ to SiO₂ mole ratios containing 20 wt.% Ni on the production of hydrogen and catalyst coke formation from the pyrolysis-catalysis of waste tyres is reported. A two-stage reactor system was used with pyrolysis of the tyres followed by catalytic reaction. There was only a small difference in the total gas yield and hydrogen yield by changing the Al₂O₃ to SiO₂ mole ratios in the Ni-Al₂O₃/SiO₂ catalyst. The 1:1 ratio of Al₂O₃:SiO₂ ratio produced the highest gas yield of 27.3 wt.% and a hydrogen production of 14.0 mmol g-1tyre. Catalyst coke formation decreased from 19.0 to 13.0 wt.% as the Al₂O₃:SiO₂ ratio was changed from 1:1 to 2:1, with more than 95% of the coke being filamentous-type carbon, a large proportion of which was multi-walled carbon nanotubes. Further experiments introduced steam to the second-stage reactor to investigate hydrogen production for the pyrolysis-catalytic steam reforming of the waste tyres using the 1:1 Al₂O₃/SiO₂ nickel catalyst. The introduction of steam produced a marked increase in total gas yield from ~27 wt. % to ~58 wt.%; in addition, hydrogen production was increased to 34.5 mmol g‾¹ and there was a reduction in catalyst coke formation to 4.6 wt.%.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © The Author(s) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 License (http://www.creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage). |
Keywords: | Waste, tyres, pyrolysis, catalyst, hydrogen, carbon nanotubes |
Dates: |
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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) |
Depositing User: | Symplectic Publications |
Date Deposited: | 16 May 2018 09:12 |
Last Modified: | 23 May 2018 08:24 |
Status: | Published |
Publisher: | Sage |
Identification Number: | 10.1177/0734242X17722207 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:130849 |