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Insight into CO2 methanation mechanism over NiUSY zeolites: An operando IR study

Abstract : Ni-impregnated USY zeolites with increasing Ni content (5, 10, 14%(wt).) were investigated by operando IR spectroscopy for both CO2 adsorption and CO2 methanation conditions reaction. In-situ FTIR and TPD experiments highlighted a rather weak CO2 adsorption, which occurs namely as carbonates or CO2 linear complexes over cations (e.g., Na+). Under methanation conditions, dissociated hydrogen reacts with carbonates and/or physisorbed CO2, leading to monodentate formates, then carbonyls (both adsorbed onto Ni-0 particles), and finally to methane. A detailed mechanism of the pathways involved in CO2 methanation over NiUSY catalysts is then discussed in accordance with infrared spectroscopic data.
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https://hal.univ-lorraine.fr/hal-01518329
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Submitted on : Thursday, May 4, 2017 - 2:53:50 PM
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A. Westermann, B. Azambre, M. C. Bacariza, I. Graça, M. F. Ribeiro, et al.. Insight into CO2 methanation mechanism over NiUSY zeolites: An operando IR study. Applied Catalysis B: Environmental, Elsevier, 2015, 174, pp.120-125. ⟨10.1016/j.apcatb.2015.02.026⟩. ⟨hal-01518329⟩

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