Recent progress in the application of Ni-based catalysts for the dry reforming of methane

Abstract

Ni-based catalysts are highly efficient in methane-reforming processes. In the particular case of methane reforming in the presence of carbon dioxide, or dry reforming of methane (DRM), it is necessary to modify and control the initial properties of the catalyst to confer on it resistance to carbon deposition in particular, and to sintering of the Ni metal particles. In this regard, catalytic supports and promoters of different natures have been proposed. Likewise, the addition of small amounts of noble metals to avoid oxidation of the Ni active phase during the reforming reaction has been proposed. Catalyst preparation methods have also been identified as being of particular interest, since they can affect the structure of the Ni metal particles. In this review, the thermodynamic and kinetic aspects of the dry reforming of methane reaction are presented first. The most recent developments in synthetic methods (impregnation, sol-gel, co-precipitation, equilibrium deposition filtration, atomic layer deposition, non-thermal glow discharge plasma, multi-bubble sonoluminescence, "core-shell" structure) aimed at maximizing the dispersion and thermal resistance of Ni particles are then discussed and compared. The catalytic supports used to promote dispersion of the active metallic phase, the oxygen-storage capacity, and the metal/support interaction are also described. The review then addresses the fact that both the nature of the support and the addition of promoters and other metallic phases that modify the surface properties can control the interaction between the metal and the support, the electronic density of the active phase, and the degree of Ni reduction. Finally, new lines of research focused on the DRM process to make the reaction conditions milder and favor the process at low temperatures are also summarized.

Characterizing catalyst function and transformations in the plasma reduction of CO2 on atomic layer deposition-synthesized catalysts

“…[1][2][3] Due to environmental concerns and developing economic incentives, a number of technologies have been developed for transforming captured CO 2 into more useful molecules as a feedstock for other chemical processes. [4][5][6][7] One promising example is the use of non-thermal plasmas to convert CO 2 into CO and O 2 , with the product CO of use to other industrial or synthetic applications. [8][9][10][11][12][13][14] The dielectric barrier discharge (DBD) reactor is commonly used for this reaction, as it is relatively straightforward to construct and is capable of producing a non-thermal plasma with relatively highenergy electrons (1-10 eV) and low bulk gas temperatures.…”

CO2 capture and dissociation on novel Ni/CaO bifunctional materials: A theoretical study

“…7 Most of the existing research on DRM processes focused on the development of highly efficient catalysts with enhanced low-temperature activity as well as high resistance to sintering, high wear resistance, and less coking. [8][9][10] Traditional DRM processes require high-purity CO 2 feed to reform CH 4 , which limits the successful application of industrial CO 2 sources (e.g., flue gases). Chemical looping-dry reforming of methane (CL-DRM) is a new CCU approach that can be used as an alternative to conventional reforming CO 2 of methane.…”

Emergent Ni catalysts induced by nitride-to-oxide transformation for coking and sintering resistant dry reforming of methane

“…[8][9][10] Ni-based catalysts are widely used for DRM because of their comparable activity to precious metals and their availability. 11,12 However, DRM is a highly endothermic reaction, which is generally carried out at a high temperature (4700 1C), 13,14 leading to the deactivation of the catalyst by Ni particle sintering or coke deposition during the long reaction process. [15][16][17] Generally, carbon deposition originates from CH 4 decomposition and CO disproportionation.…”