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Effect of the ZrO2–Al2O3 solid solution on the performance of Ni/ZrO2–Al2O3 catalysts for CO2 methanation.
- Source :
- New Journal of Chemistry; 12/14/2021, Vol. 45 Issue 46, p21557-21568, 12p
- Publication Year :
- 2021
-
Abstract
- The conversion of CO<subscript>2</subscript> into value-added chemicals has attracted a lot of attention, not only reducing the concentration of CO<subscript>2</subscript> in the air, but also generating chemicals and fuels, which are of great importance to solve the growing environmental and energy problems. Ni catalysts with different Zr/Al ratios were prepared by co-precipitation and impregnation for CO<subscript>2</subscript> methanation. The activity test results showed that almost 100% CH<subscript>4</subscript> selectivity and 82.6% CO<subscript>2</subscript> conversion were obtained at a reaction temperature of 350 °C when the Zr/Al ratio was 1. The physicochemical properties of the catalysts were investigated using XRD, N<subscript>2</subscript> adsorption–desorption, H<subscript>2</subscript>-TPR, H<subscript>2</subscript>-TPD, CO<subscript>2</subscript>-TPD, XPS and TEM, and the surface-generating substances and methanation reaction mechanism of the catalysts were explored using in situ DRIFTS characterisation. The experimental results show that the addition of Al<subscript>2</subscript>O<subscript>3</subscript> to Ni/ZrO<subscript>2</subscript> weakens the Ni–ZrO<subscript>2</subscript> interaction and promotes the reduction and dispersion of NiO through the solid solution bonding of ZrO<subscript>2</subscript>–Al<subscript>2</subscript>O<subscript>3</subscript>. The in situ DRIFTS results show that there are more formate adsorbed species on the surface of the Ni/ZrO<subscript>2</subscript>–Al<subscript>2</subscript>O<subscript>3</subscript> catalyst compared to the Ni/ZrO<subscript>2</subscript> catalyst, which is the main formation substance for CO<subscript>2</subscript> methanation. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 45
- Issue :
- 46
- Database :
- Complementary Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 153843479
- Full Text :
- https://doi.org/10.1039/d1nj03684j