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Improving the performance of nickel catalyst supported on mesostructured silica nanoparticles in methanation of CO2-rich gas by urea–nitrate combustion.
- Source :
- Chemical Papers; Nov2020, Vol. 74 Issue 11, p3925-3935, 11p
- Publication Year :
- 2020
-
Abstract
- In this work, NiO supported mesostructured silica nanoparticles (MSN) were synthesized via the urea–nitrate combustion method using urea as fuel and nitrate salts as oxidants with the different urea/nitrate ratios and calcination duration. The physicochemical properties of catalysts were investigated by several techniques, including N<subscript>2</subscript> physisorption measurements, powder X-ray diffraction, N<subscript>2</subscript>-BET isothermal adsorption, hydrogen temperature-programmed reduction, carbon dioxide temperature-programmed desorption, scanning electron microscopy and transmission electron microscopy. The obtained catalysts were employed in the methanation of CO<subscript>2</subscript>-rich gas at a temperature range of 225–400 °C with the CO<subscript>2</subscript>/H<subscript>2</subscript> ratio of 1/4 and CO<subscript>2</subscript> concentration of 20 mol%. The results showed that using the urea–nitrate combustion method in synthesizing catalysts led to improved physicochemical properties that increased the activity of NiO/MSN catalysts. The catalyst prepared with the urea/nitrate molar ratio of 3 and calcined at 600 °C for 3 h showed the highest catalytic performance in methanation of CO<subscript>2</subscript>-rich gas, reaching CO<subscript>2</subscript> conversion of 96% and CH<subscript>4</subscript> selectivity of 100% at 375 °C. The best catalyst has excellent stability in CO<subscript>2</subscript> solo-hydrogenation at a reaction temperature of 375 °C during 30 h of reaction thanks to the resistance to coke formation. Besides, adding 1 mol% CO in the feedstock should be simultaneously conducted to surge the effectivity of CO<subscript>2</subscript> methanation. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03666352
- Volume :
- 74
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Chemical Papers
- Publication Type :
- Academic Journal
- Accession number :
- 145258456
- Full Text :
- https://doi.org/10.1007/s11696-020-01207-0