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CO2 reutilization for methane production via a catalytic process promoted by hydrides.
- Source :
- Physical Chemistry Chemical Physics (PCCP); 9/28/2019, Vol. 21 Issue 36, p19825-19834, 10p
- Publication Year :
- 2019
-
Abstract
- CO<subscript>2</subscript> emissions have been continuously increasing during the last half of the century with a relevant impact on the planet and are the main contributor to the greenhouse effect and global warming. The development of new technologies to mitigate these emissions poses a challenge. Herein, the recycling of CO<subscript>2</subscript> to produce CH<subscript>4</subscript> selectively by using Mg<subscript>2</subscript>FeH<subscript>6</subscript> and Mg<subscript>2</subscript>NiH<subscript>4</subscript> complex hydrides as dual conversion promoters and hydrogen sources has been demonstrated. Magnesium-based metal hydrides containing Fe and Ni catalyzed the hydrogenation of CO<subscript>2</subscript> and their total conversion was obtained at 400 °C after 5 h and 10 h, respectively. The complete hydrogenation of CO<subscript>2</subscript> depended on the complex hydride, H<subscript>2</subscript> : CO<subscript>2</subscript> mol ratio, and experimental conditions: temperature and time. For both hydrides, the activation of CO<subscript>2</subscript> on the metal surface and its subsequent capture resulted in the formation of MgO. Investigations on the Mg<subscript>2</subscript>FeH<subscript>6</subscript>–CO<subscript>2</subscript> system indicated that the main process occurs via the reversed water–gas shift reaction (WGSR), followed by the methanation of CO in the presence of steam. In contrast, the reduction of CO<subscript>2</subscript> by the Mg-based hydride in the Mg<subscript>2</subscript>NiH<subscript>4</subscript>–CO<subscript>2</subscript> system has a strong contribution to the global process. Complex metal hydrides are promising dual promoter-hydrogen sources for CO<subscript>2</subscript> recycling and conversion into valuable fuels such as CH<subscript>4</subscript>. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14639076
- Volume :
- 21
- Issue :
- 36
- Database :
- Complementary Index
- Journal :
- Physical Chemistry Chemical Physics (PCCP)
- Publication Type :
- Academic Journal
- Accession number :
- 138777934
- Full Text :
- https://doi.org/10.1039/c9cp03826d