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Study of the Synthetic Approach Influence in Ni/CeO<sub>2</sub>-Based Catalysts for Methane Dry Reforming
oleh: Marco Pizzolato, Giulia Da Pian, Elena Ghedini, Alessandro Di Michele, Federica Menegazzo, Giuseppe Cruciani, Michela Signoretto
Format: | Article |
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Diterbitkan: | MDPI AG 2022-12-01 |
Deskripsi
This study focuses on the synthetic approach influence in morphostructural features and catalytic performances for Ni/CeO<sub>2</sub> catalysts. Incipient wetness impregnation, coprecipitation and nitrate combustion were studied as catalyst preparation approaches, and the materials were then tested at 700 °C for methane dry reforming (MDR). The morphostructural properties of the materials were deeply studied using several techniques, such as temperature programmed reduction (TPR), to investigate reducibility and support-metal interaction, N<sub>2</sub> physisorption to evaluate the porosity and the surface area, scanning electron microscopy (SEM) and X-ray diffraction (XRD) to estimate Ni dispersion, and temperature programmed oxidation (TPO) to identify the type and amount of coke formed on catalysts’ surface after reaction. From the data obtained, coprecipitation turned out to be the most suitable technique for this application because this catalyst was able to reach 70% of CO<sub>2</sub> conversion and 30% methane conversion, with an H<sub>2</sub> yield of 15% and 30% yield of CO at the end of the 30 h test. Moreover, it was also the catalyst with the highest metal dispersion, the strongest interaction with the support, and the lowest coke deposition.