Facile use of coal combustion fly ash (CCFA) as Ni-Re bimetallic catalyst support for high-performance CO2 methanation
Copyright © 2020 Elsevier Ltd. All rights reserved.
| Veröffentlicht in: | Waste management (New York, N.Y.). - 1999. - 107(2020) vom: 15. Apr., Seite 244-251 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2020
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| Zugriff auf das übergeordnete Werk: | Waste management (New York, N.Y.) |
| Schlagworte: | Journal Article Fly ash Methanation Ni-based catalyst Rhenium Waste treatment Coal Coal Ash Carbon Dioxide 142M471B3J mehr... |
| Zusammenfassung: | Copyright © 2020 Elsevier Ltd. All rights reserved. The industrial waste coal combustion fly ash (CCFA) was used as a cheap catalyst support and by facile co-impregnation method, the active component Ni and promoter Re was loaded to form a bimetallic catalyst for high-performance CO2 methanation. The physico-chemical properties of the prepared catalyst were further measured by a series of characterizations such as X-ray fluorescence (XRF), N2 isothermal adsorption-desorption, X-ray diffraction (XRD), H2 temperature-programmed reduction (H2-TPR) et al. The effect of reaction temperature and gas hourly space velocity (GHSV) on the catalytic performance was carefully investigated on a continuous fixed-bed reactor. The results showed that in comparison with the non-promoted monometallic Ni/CCFA catalyst, the bimetallic Ni-Re/CCFA catalyst displayed a superior activity, which could achieve 99.55% of CO2 conversion and 70.27% of CH4 selectivity under the condition of 400 °C, 2000 h-1, 1 atm and H2:CO2:N2 = 4:1:0.5, possibly owing to the higher Ni dispersion and more active sites in Ni-Re/CCFA. Besides, the addition of Re promoter was beneficial to enhance the catalyst anti-sintering and anti-coking abilities as reflected by the smaller Ni particle size growth and less carbon deposition amount in Ni-Re/CCFA. The in-situ diffuse reflection infrared Fourier transform spectrum (in-situ DRIFTS) was finally carried out to determine the CO2 adsorption state and its methanation intermediates, from which a loop mechanism of CO2 methanation process was proposed and depicted |
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| Beschreibung: | Date Completed 21.05.2020 Date Revised 21.05.2020 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1879-2456 |
| DOI: | 10.1016/j.wasman.2020.04.014 |