One-Pot Synthesis of Ni<sub>0.05</sub>Ce<sub>0.95</sub>O<sub>2−δ</sub> Catalysts with Nanocubes and Nanorods Morphology for CO<sub>2</sub> Methanation Reaction and in Operando DRIFT Analysis of Intermediate Species
The valorization of CO<sub>2</sub> via renewable energy sources allows one to obtain carbon-neutral fuels through its hydrogenation, like methane. In this study, Ni<sub>0.05</sub>Ce<sub>0.95</sub>O<sub>2−δ</sub> catalysts were prepared using a simple o...
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| Main Authors: | , , , , , , , |
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| Format: | article |
| Language: | EN |
| Published: |
MDPI AG
2021
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| Subjects: | |
| Online Access: | https://doaj.org/article/838a0134d4dd48ef8b62fafa97b9f5fd |
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| Summary: | The valorization of CO<sub>2</sub> via renewable energy sources allows one to obtain carbon-neutral fuels through its hydrogenation, like methane. In this study, Ni<sub>0.05</sub>Ce<sub>0.95</sub>O<sub>2−δ</sub> catalysts were prepared using a simple one-pot hydrothermal method yielding nanorod and nanocube particles to be used for the methanation reaction. Samples were characterized by XRD, BET, TEM, H<sub>2</sub>-TPR, and H<sub>2</sub>-TPD experiments. The catalytic activity tests revealed that the best performing catalyst was Ni<sub>0.05</sub>Ce<sub>0.95</sub>O<sub>2−δ</sub>, with nanorod morphology, which gave a CO<sub>2</sub> conversion of 40% with a selectivity of CH<sub>4</sub> as high as 93%, operating at 325 °C and a GHSV of 240,000 cm<sup>3</sup> h<sup>−1</sup> g<sup>−1</sup>. However, the lower activation energy was found for Ni<sub>0.05</sub>Ce<sub>0.95</sub>O<sub>2−δ</sub> catalysts with nanocube morphology. Furthermore, an in operando diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) analysis was performed flowing CO<sub>2</sub>:H<sub>2</sub> or CO:H<sub>2</sub> mixture, showing that the main reaction pathway, for the CO<sub>2</sub> methanation, is the direct hydrogenation of formate intermediate. |
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