Thermal desorption and characterization of carbonaceous deposits in Mo/HZSM-5 catalyst
2019
Sanapur, Ganesh | Kumar, Arun | Mondal, Amit | Sreeramagiri, Sivakumar | Dongara, Rajeshwer | Ramaswamy, Ganeshan
Mo/HZSM-5 is the most active catalyst for dehydroaromatization of methane to benzene reaction. In this process, coking is the major problem to develop technically and economically successful process, as the catalyst gets deactivated due to blocking of active sites, pores and cavities, resulting in site poisoning. Hence, detailed information on the nature of the coke, its structure and composition are important factors to understand the performance of the catalyst. In the present paper, we present characterization of carbonaceous deposits formed on the surface of Mo/HZSM-5 catalyst using multi analytical techniques such as TDS-GC–MS, TGA, CHN and TEM. Investigated the structures of soft coke species using N2, and H2 temperature programmed desorption by applying in-house designed micro reactor for coke desorption from spent catalyst, followed by detailed composition analysis by TDS-GC–MS technique. The thermal desorption GC–MS method has advantages over the existing solvent extraction methods, in terms of sensitivity, overall analysis time and sample quantity requirements for complete studies. Additionally, this setup provides flexibility to understand the regeneration mechanism of catalyst under various environment and temperature conditions. The new in-house setup has given useful insights into structures of coke components and possible regeneration protocols.
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