Optimizing the oxide support composition in Pr-doped CeO₂ towards highly active and selective Ni-based CO₂ methanation catalysts

In this study, Ni catalysts supported on Pr-doped CeO₂ are studied for the CO₂ methanation reaction and the effect of Pr doping on the physicochemical properties and the catalytic performance is thoroughly evaluated. It is shown, that Pr³⁺ ions can substitute Ce⁴⁺ ones in the support lattice,...

Pure methane from CO₂ hydrogenation using a sorption enhanced process with catalyst/zeolite bifunctional materials

Methanation is a potential large-scale option for CO₂ utilization, and it is one of the solutions for decreasing carbon emission and production of synthetic green fuels. However, the CO₂ conversion is limited by thermodynamics in conventional reaction conditions. However, around 100 % conversion can be obtained using...

Origin of the synergistic effect between TiO₂ crystalline phases in the Ni/TiO₂-catalyzed CO₂ methanation reaction

The catalytic performances of TiO₂-supported Ni catalysts for the methanation of CO₂ have been investigated using different crystalline phases of TiO₂ (rutile and anatase). The catalytic activity of Ni depends appreciably on the nature of the support. The rate for CO₂ hydrogenation decreases in the...

Sub-nanometer ceria-promoted Ni 13X zeolite catalyst for CO₂ methanation

Sub-nanometer zeolite 13X-supported Ni-ceria catalysts were synthesized for CO₂ methanation. XRD and SEM results show the structure and morphology of 13X zeolite after impregnation and calcination. Ce loading affected the catalysts’ metal dispersion, reducibility, basicity and acidity, and thence their activity and selectivity....

Can bi-functional nickel modified 13X and 5A zeolite catalysts for CO₂ methanation be improved by introducing ruthenium?

Zeolites 13X and 5A were modified with nickel and/or ruthenium for CO₂ methanation. The catalysts were prepared by evaporation impregnation and XRD, SEM-EDX, TEM, STEM-EDX, nitrogen physisorption, H₂-TPR and NH₃-TPD were used to characterize the physico-chemical properties of the catalysts. The physico...