Abstract
Carbon dioxide (CO2) emissions are of global concern because of climate change. CO2 methanation is one of the most prestigious technologies to convert CO2 into value-added products such as substitute natural gas. In this study, a highly active fibrous silica-mordenite (FS@SiO2-MOR) catalyst has been synthesized by a microemulsion process and characterized by XRD, TEM, FESEM, N2 adsorption analysis, FTIR-pyrrole, CO2-TPD, and ESR spectroscopy. The CO2 methanation reaction was performed, and it was found that the FS@SiO2-MOR catalyst exhibited higher CH4 selectivity (68%) and CO2 conversion (65%) due to the distinctive fibrous morphology, which provided higher surface area, basic sites, and oxygen vacancies. In addition, the synthesized FS@SiO2-MOR catalyst exhibited high thermal stability (50 h) and significantly suppressed coke deposition compared to commercial mordenite. According to in-situ FTIR observations, the carbonyls and linear CO2* were the essential intermediates species for the formation of methane during CO2 methanation via an associative mechanism.
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