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Synthesis of fumed silica supported Ni catalyst for carbon dioxide conversion to methane
Author(s) -
Mohammed Ahmed Aheed Ali,
Saad Mohammed Ali H Saleh,
Kumar Anand,
AlMarri Mohammed J
Publication year - 2020
Publication title -
greenhouse gases: science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.45
H-Index - 32
ISSN - 2152-3878
DOI - 10.1002/ghg.1975
Subject(s) - fumed silica , catalysis , methane , adsorption , chemical engineering , formate , hydrogen , chemistry , selectivity , materials science , carbon dioxide , inorganic chemistry , organic chemistry , engineering
In this study, we report the synthesis of a fumed silica supported Ni‐based catalyst for carbon dioxide conversion to methane. Ni/fumed‐SiO 2 was prepared by loading the active agent precursor solution on the high surface area fumed SiO 2 through the wet impregnation technique. Thereafter, the resulting powder was dried and reduced under hydrogen flow at 750°C for 3 h to get the desired active agent. The CO 2 catalytic hydrogenation was performed using a flow reactor between 50 and 650°C temperature, where it showed good catalytic activity and selectivity for methane. In addition, it is found to be highly stable under reaction conditions for 16 h time on stream. Fresh and used (after the stability test) catalyst samples were characterized using different techniques, such as XRD, TEM, SEM/EDX, to investigate the structural and morphological properties, and effect of exposure to reaction conditions on the catalysts. Furthermore, the reaction mechanism was investigated using in‐situ DRIFT in the temperature range 50–450°C. The results revealed the formation of formate species at early reaction stages, followed by CO that was detected as linearly adsorbed on Ni surface, and lastly methane formation. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.