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CO<sub>2</sub> Hydrogenation to Methane over Ni-Catalysts: The Effect of Support and Vanadia Promoting
oleh: Izabela S. Pieta, Agnieszka Lewalska-Graczyk, Pawel Kowalik, Katarzyna Antoniak-Jurak, Mikolaj Krysa, Anna Sroka-Bartnicka, Arkadiusz Gajek, Wojciech Lisowski, Dusan Mrdenovic, Piotr Pieta, Robert Nowakowski, Agata Lew, Ewa M. Serwicka
Format: | Article |
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Diterbitkan: | MDPI AG 2021-03-01 |
Deskripsi
Within the Waste2Fuel project, innovative, high-performance, and cost-effective fuel production methods are developed to target the “closed carbon cycle”. The catalysts supported on different metal oxides were characterized by XRD, XPS, Raman, UV-Vis, temperature-programmed techniques; then, they were tested in CO<sub>2</sub> hydrogenation at 1 bar. Moreover, the V<sub>2</sub>O<sub>5</sub> promotion was studied for Ni/Al<sub>2</sub>O<sub>3</sub> catalyst. The precisely designed hydrotalcite-derived catalyst and vanadia-promoted Ni-catalysts deliver exceptional conversions for the studied processes, presenting high durability and selectivity, outperforming the best-known catalysts. The equilibrium conversion was reached at temperatures around 623 K, with the primary product of reaction CH<sub>4</sub> (>97% CH<sub>4</sub> yield). Although the Ni loading in hydrotalcite-derived NiWP is lower by more than 40%, compared to reference NiR catalyst and available commercial samples, the activity increases for this sample, reaching almost equilibrium values (GHSV = 1.2 × 10<sup>4</sup> h<sup>–1</sup>, 1 atm, and 293 K).