CO2 Methanation of Biogas over 20 wt% Ni-Mg-Al Catalyst: on the Effect of N2, CH4, and O2 on CO2 Conversion Rate
| Autor: | Danbee Han, Wonjun Cho, Yunji Kim, Youngsoon Baek, Hyunseung Byun |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Scanning electron microscope 02 engineering and technology 010402 general chemistry lcsh:Chemical technology 01 natural sciences Catalysis lcsh:Chemistry X-ray photoelectron spectroscopy Biogas Methanation lcsh:TP1-1185 Physical and Theoretical Chemistry energy_fuel_technology Power to gas CO2 methanation Ni catalyst 021001 nanoscience & nanotechnology 0104 chemical sciences lcsh:QD1-999 biogas utilization power to gas 0210 nano-technology Selectivity CO2 hydrogenation Nuclear chemistry Space velocity |
| Zdroj: | Catalysts, Vol 10, Iss 1201, p 1201 (2020) Catalysts Volume 10 Issue 10 |
| ISSN: | 2073-4344 |
| Popis: | Biogas contains more than 40% CO2 that can be removed to produce high quality CH4. Recently, CH4 production from CO2 methanation has been reported in several studies. In this study, CO2 methanation of biogas was performed over a 20 wt% Ni-Mg-Al catalyst, and the effects of CO2 conversion rate and CH4 selectivity were investigated as a function of CH4, O2, H2O, and N2 compositions of the biogas. At a gas hourly space velocity (GHSV) of 30,000 h&minus 1, the CO2 conversion rate was ~79.3% with a CH4 selectivity of 95%. In addition, the effects of the reaction temperature (200&ndash 450 ° C), GHSV (21,000&ndash 50,000 h&minus 1), and H2/CO2 molar ratio (3&ndash 5) on the CO2 conversion rate and CH4 selectivity over the 20 wt% Ni-Mg-Al catalyst were evaluated. The characteristics of the catalyst were analyzed using Brunauer&ndash Emmett&ndash Teller surface area analysis, X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy. The catalyst was stable for approximately 200 h at a GHSV of 30,000 h&minus 1 and a reaction temperature of 350 ° C. CO2 conversion and CH4 selectivity were maintained at 75% and 93%, respectively, and the catalyst was therefore concluded to exhibit stable activity. |
| Databáze: | OpenAIRE |
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