A study on CO2 hydrogenation using a ceria-zirconia mixed oxide (CexZr1-xO2)-supported Fe catalyst

Saheli Biswas, Chandan Kundu, Aniruddha P. Kulkarni, Shyam Kattel, Sarbjit Giddey, Sankar Bhattacharya

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Fe-impregnated CexZr1-xO2 supports were studied for CO2 methanation at 300, 400, and 500 °C under pressures 1 bar to 30 bars using a H2/CO2 (4:1 v/v) mixture, and their performance was compared to Fe-impregnated ZrO2. The variables affecting performance included temperature, pressure, and iron and cerium loadings. The iron loading that resulted in maximum CH4 selectivity and yield was 10 wt %. At 500 °C, Fe-CexZr1-xO2 increased the CO2 uptake of the catalyst and its conversion to CO and CH4 by more than 50% compared to Fe-ZrO2. As a result, CH4 yield monotonically increased with temperature, but for Fe-ZrO2, it gradually decreased with temperature. Contrarily, at lower temperatures, Fe-ZrO2 gave higher CO2 conversion and CH4 yield. The highest CH4 yield was 25% with 10% Fe-Ce0.1Zr0.9O2 at 500 °C and 30 bars. This composition was also found to be highly stable over a continuous testing period of 100 h at 500 °C and 20 bars. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) studies indicated the possibility of a formate-assisted pathway of CH4 formation on Fe-CexZr1-xO2.

Original languageEnglish
Pages (from-to)14410–14423
Number of pages14
JournalIndustrial and Engineering Chemistry Research
Issue number40
Publication statusPublished - 29 Sept 2021

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