Journal
MOLECULAR CATALYSIS
Volume 466, Issue -, Pages 167-180Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mcat.2019.01.020
Keywords
Co3O4; In situ FTIR; PrOx mechanism; CO2 methanation; CO oxidation
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Funding
- Department of Science and Technology (DST), India [DST 1429]
- BITS-Pilani, Hyderabad, India [RIG 733]
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In the present study, cobalt oxide (Co3O4) and Cu substituted Co3O4 were synthesized using sonochemical method. The role of Cu substitution was studied for CO oxidation in absence of H-2 as well as in H-2 rich conditions (PrOx). The synthesized catalysts were characterized by XRD, XPS, TEM and BET. The role of side reactions such as H-2 oxidation and CO2 methanation in inhibiting the CO oxidation reaction were discussed. H-2 - TPR and in situ FTIR were conducted to understand the reducible nature of the support and reaction mechanism. The intermediate species such as carbonates, bicarbonates, formates play an important role for CO oxidation under H-2 rich conditions. Further, the utilization of atomic hydrogen by surface CO2 species, enhanced the methane formation. A detailed reaction mechanism was proposed for both CO oxidation and PrOx conditions with the insights obtained from in situ FTIR. 3% Cu/Co3O4 showed high stability for CO oxidation under hydrogen rich conditions for 50 h at 170 degrees C as well as in methanation prone region at 200 degrees C.
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