CO2 Hydrogenation to Methane over Ni-Catalysts: The Effect of Support and Vanadia Promoting
Izabela S. Pieta, Agnieszka Lewalska, Paweł Kowalik, Katarzyna Antoniak‐Jurak, Mikołaj Krysa, Anna Sroka‐Bartnicka, Arkadiusz Gajek, Wojciech Lisowski, Dušan Mrđenović, Piotr Pięta, Robert Nowakowski, Agata Lew, Ewa M. Serwicka
Abstract
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 CO2 hydrogenation at 1 bar. Moreover, the V2O5 promotion was studied for Ni/Al2O3 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 CH4 (>97% CH4 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 × 104 h–1, 1 atm, and 293 K).