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$CO_{2}$ Methanation Using Multimodal $Ni/SiO_{2}$ Catalysts: Effect of Support Modification by MgO, $CeO_{2}$, and $La_{2}O_{3}$
| Content Provider | MDPI |
|---|---|
| Author | Mihet, Maria Dan, Monica Barbu-Tudoran, Lucian Lazar, Mihaela |
| Copyright Year | 2021 |
| Description | Ni/oxide-SiO2 (oxide: MgO, CeO2, La2O3, 10 wt.% target concentration) catalyst samples were prepared by successive impregnation of silica matrix, first with supplementary oxide, and then with Ni (10 wt.% target concentration). The silica matrix with multimodal pore structure was prepared by solvothermal method. The catalyst samples were structurally characterized by N2 adsorption-desorption, XRD, SEM/TEM, and functionally evaluated by temperature programmed reduction (TPR), and temperature programmed desorption of hydrogen (H2-TPD), or carbon dioxide (CO2-TPD). The addition of MgO and La2O3 leads to a better dispersion of Ni on the catalytic surface. Ni/LaSi and Ni/CeSi present a higher proportion of moderate strength basic sites for CO2 activation compared to Ni/Si, while Ni/MgSi lower. CO2 methanation was performed in the temperature range of 150–350 °C and at atmospheric pressure, all silica supported Ni catalysts showing good CO2 conversion and CH4 selectivity. The best catalytic activity was obtained for Ni/LaSi: CO2 conversion of 83% and methane selectivity of 98%, at temperatures as low as 250 °C. The used catalysts preserved the multimodal pore structure with approximately the same pore size for the low and medium mesopores. Except for Ni/CeSi, no particle sintering occurs, and no carbon deposition was observed for any of the tested catalysts. |
| Starting Page | 443 |
| e-ISSN | 20734344 |
| DOI | 10.3390/catal11040443 |
| Journal | Catalysts |
| Issue Number | 4 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-03-30 |
| Access Restriction | Open |
| Subject Keyword | Catalysts Applied Chemistry Silica Supported Ni Catalysts Co2 Methanation Multimodal Pores Catalysts H2-tpd Co2-tpd for Silica Supported Ni Catalyst |
| Content Type | Text |
| Resource Type | Article |
