Catalytic activity and coke resistance of gasification slag-supported Ni catalysts during steam reforming of plastic pyrolysis gas
Pyrolysis gas from polyolefinic plastic waste is a hydrocarbon-rich feedstock for sustainable syngas production. The effect of Cr, Mo, and W promoters on the activity of gasification slag-supported Ni catalysts during the reforming of plastic pyrolysis gas was investigated (polyethylene and polyprop...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2023
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| Online Access: | https://hdl.handle.net/10356/164599 |
| _version_ | 1811695209625419776 |
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| author | Ong, Hang Meng Veksha, Andrei Ha, Quan Luu Manh Huang, Jijiang Tsakadze, Zviad Lisak, Grzegorz |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Ong, Hang Meng Veksha, Andrei Ha, Quan Luu Manh Huang, Jijiang Tsakadze, Zviad Lisak, Grzegorz |
| author_sort | Ong, Hang Meng |
| collection | NTU |
| description | Pyrolysis gas from polyolefinic plastic waste is a hydrocarbon-rich feedstock for sustainable syngas production. The effect of Cr, Mo, and W promoters on the activity of gasification slag-supported Ni catalysts during the reforming of plastic pyrolysis gas was investigated (polyethylene and polypropylene mixed feedstock, Ni:promoter molar ratio = 4.5, 800 °C, steam-To-carbon molar ratio of 7). Based on 3 h reforming tests, all catalysts showed stable conversion efficiency, suggesting that gasification slag from municipal solid waste is a promising replacement material for traditionally used alumina supports. Moreover, the slag demonstrated good thermal stability and potential for catalyst recycling, justifying the economic benefit of valorizing the material. Interestingly, interaction between slags and promoters is evidenced by the formation of CaWO4and CaMoO4phases, which may have an impact on the reforming activity of bimetallic catalysts. Among the studied catalysts, the highest conversion efficiency of hydrocarbon compounds (76%), highest H2(122.65 mmol Lfeed-1) and CO (49.34 mmol Lfeed-1) yields, and lowest coke deposition (0.06 wt %) were demonstrated by the Ni-Mo catalyst. The superior performance of Ni-Mo was accompanied by the growth of carbon nanotubes via a tip-growth mechanism, which was not observed in other catalysts. Spherical carbon nanocages and filamentous carbon nanofibers predominated in coke deposits of Ni, Ni-W, and Ni-Cr. The high syngas production efficiency of Ni-Mo could be attributed to the dispersion of metal by the growing carbon nanotubes providing the reaction sites for reforming and coke gasification reactions. Owing to these properties, Ni catalyst promoted by Mo and loaded on a gasification support has high potential for the syngas production from plastic pyrolysis gas. |
| first_indexed | 2024-10-01T07:19:50Z |
| format | Journal Article |
| id | ntu-10356/164599 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:19:50Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1645992023-03-31T01:59:33Z Catalytic activity and coke resistance of gasification slag-supported Ni catalysts during steam reforming of plastic pyrolysis gas Ong, Hang Meng Veksha, Andrei Ha, Quan Luu Manh Huang, Jijiang Tsakadze, Zviad Lisak, Grzegorz School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute Residues and Resource Reclamation Centre Engineering::Environmental engineering::Waste management Gasification Slag Nickel Catalyst Pyrolysis gas from polyolefinic plastic waste is a hydrocarbon-rich feedstock for sustainable syngas production. The effect of Cr, Mo, and W promoters on the activity of gasification slag-supported Ni catalysts during the reforming of plastic pyrolysis gas was investigated (polyethylene and polypropylene mixed feedstock, Ni:promoter molar ratio = 4.5, 800 °C, steam-To-carbon molar ratio of 7). Based on 3 h reforming tests, all catalysts showed stable conversion efficiency, suggesting that gasification slag from municipal solid waste is a promising replacement material for traditionally used alumina supports. Moreover, the slag demonstrated good thermal stability and potential for catalyst recycling, justifying the economic benefit of valorizing the material. Interestingly, interaction between slags and promoters is evidenced by the formation of CaWO4and CaMoO4phases, which may have an impact on the reforming activity of bimetallic catalysts. Among the studied catalysts, the highest conversion efficiency of hydrocarbon compounds (76%), highest H2(122.65 mmol Lfeed-1) and CO (49.34 mmol Lfeed-1) yields, and lowest coke deposition (0.06 wt %) were demonstrated by the Ni-Mo catalyst. The superior performance of Ni-Mo was accompanied by the growth of carbon nanotubes via a tip-growth mechanism, which was not observed in other catalysts. Spherical carbon nanocages and filamentous carbon nanofibers predominated in coke deposits of Ni, Ni-W, and Ni-Cr. The high syngas production efficiency of Ni-Mo could be attributed to the dispersion of metal by the growing carbon nanotubes providing the reaction sites for reforming and coke gasification reactions. Owing to these properties, Ni catalyst promoted by Mo and loaded on a gasification support has high potential for the syngas production from plastic pyrolysis gas. National Research Foundation (NRF) Public Utilities Board (PUB) This research was supported by the National Research Foundation, Singapore and PUB, Singapore’s National Water Agency under its RIE2025 Urban Solutions and Sustainability (USS) (Water) Centre of Excellence (CoE) Programme, which provides funding to the Nanyang Environment & Water Research Institute (NEWRI) of the Nanyang Technological University, Singapore (NTU). 2023-02-06T05:46:26Z 2023-02-06T05:46:26Z 2022 Journal Article Ong, H. M., Veksha, A., Ha, Q. L. M., Huang, J., Tsakadze, Z. & Lisak, G. (2022). Catalytic activity and coke resistance of gasification slag-supported Ni catalysts during steam reforming of plastic pyrolysis gas. ACS Sustainable Chemistry & Engineering, 10(51), 17167-17176. https://dx.doi.org/10.1021/acssuschemeng.2c04946 2168-0485 https://hdl.handle.net/10356/164599 10.1021/acssuschemeng.2c04946 2-s2.0-85144284387 51 10 17167 17176 en ACS Sustainable Chemistry & Engineering © 2022 American Chemical Society. All rights reserved. |
| spellingShingle | Engineering::Environmental engineering::Waste management Gasification Slag Nickel Catalyst Ong, Hang Meng Veksha, Andrei Ha, Quan Luu Manh Huang, Jijiang Tsakadze, Zviad Lisak, Grzegorz Catalytic activity and coke resistance of gasification slag-supported Ni catalysts during steam reforming of plastic pyrolysis gas |
| title | Catalytic activity and coke resistance of gasification slag-supported Ni catalysts during steam reforming of plastic pyrolysis gas |
| title_full | Catalytic activity and coke resistance of gasification slag-supported Ni catalysts during steam reforming of plastic pyrolysis gas |
| title_fullStr | Catalytic activity and coke resistance of gasification slag-supported Ni catalysts during steam reforming of plastic pyrolysis gas |
| title_full_unstemmed | Catalytic activity and coke resistance of gasification slag-supported Ni catalysts during steam reforming of plastic pyrolysis gas |
| title_short | Catalytic activity and coke resistance of gasification slag-supported Ni catalysts during steam reforming of plastic pyrolysis gas |
| title_sort | catalytic activity and coke resistance of gasification slag supported ni catalysts during steam reforming of plastic pyrolysis gas |
| topic | Engineering::Environmental engineering::Waste management Gasification Slag Nickel Catalyst |
| url | https://hdl.handle.net/10356/164599 |
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