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 Ni0 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.
Original language | English |
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Pages (from-to) | 120-125 |
Number of pages | 6 |
Journal | Applied Catalysis B: Environmental |
Volume | 174-175 |
DOIs | |
Publication status | Published - 1 Sept 2015 |
Bibliographical note
AcknowledgementsThis work was supported by the Framework 7 program, under the project CEOPS – CO2 – loop for energy storage and conversion to organic chemistry processes through advanced catalytic systems (FP7-NMP-2012-309984).
Keywords
- Carbonyls
- Formates
- Infrared operando spectroscopy
- Mechanism
- Ni-based zeolite
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Ines Biscaya Semedo Pereira da Graca
- Engineering, Engineering - Lecturer
- Centre for Energy Transition
Person: Academic