Design Strategy, Synthesis, and Mechanism of Ni Catalysts for Methane Dry Reforming Reaction: Recent Advances and Future Perspectives

Abstract

Methane dry reforming (MDR, CH4 + CO2 → CO + H2) receives great attention because of the contributions to reducing the emission of greenhouse gases and producing valuable syngas. In order to provide a clear sense of the progress of Ni-based catalysts for MDR in recent decades, we summarized the latest related research papers to illustrate new achievements from the aspects of catalyst preparation and molecule activation. First, the reaction patterns and thermodynamics in MDR are briefly introduced. Then, recent advances in design strategy, synthesis approaches, and the MDR mechanism of Ni catalysts are reviewed in detail. Finally, general remarks and perspectives for MDR in the near future are suggested. The challenges of sintering and carbon deposition on the Ni-based catalysts can be alleviated by rational catalyst design and synthesis, and the pathway of MDR can be revealed by mechanism investigation. These strongly support the establishment of a structure–performance relationship for the MDR reaction over the Ni-based catalysts. It is hoped that this paper will give researchers new ideas and guidance for innovation regarding the MDR reaction, especially for designing stable Ni catalysts and studying the MDR mechanism.

CeO2 Nanorods Decorated with Pt Nanoparticles as Catalysts for Oxidative Elimination of Formaldehyde

“…A suspension was prepared by dispersing 1 g CeO 2 powder in 200 mL of water, and the pH of the suspension was adjusted to 12. A solution of Pt complex precursor containing 0.002 g Pt was prepared by adding ammonia to H 2 PtCl 6 solution until pH = 12. , The Pt complex solution was poured into the CeO 2 suspension for stirring overnight. After being washed by hot de-ionic water for at least three times, the slurry was dried at 343 K and calcined at 673 K. The resultant powders with the theoretical Pt content of 0.2 wt % gave 0.2Pt/CeO 2 -A, 0.2Pt/CeO 2 -B, and 0.2Pt/CeO 2 -C. The above synthesis procedure is illustrated in Scheme .…”

Regulating the Pt–MnO2 Interaction and Interface for Room Temperature Formaldehyde Oxidation

“…As is well-known in gas−solid catalysis reactions, several steps are involved from reactants to products. 44 The first step is the adsorption in which reactants are externally diffusing from gas bulk to solid catalyst surface (I), and the second step is the internal diffusion in which the reactants on the catalyst surface are internally diffusing to active sites through mesopores of the catalyst (II). The molecules reaching the active sites are activated to intermediates (III), followed by the surface reaction of intermediates at the metal−support interface to adsorbed product molecules (IV).…”

Ni–Cu Alloy Nanoparticles Confined by Physical Encapsulation with SiO2 and Chemical Metal–Support Interaction with CeO2 for Methane Dry Reforming

“…have good MDR activity, but the costs limit their applications. − Transition-metal Ni has MDR activity comparable to that of the noble metals; the low cost makes it more suitable for industrial production. Consequently, Ni catalyst synthesis for high-performance MDR becomes a hotspot in recent decades. − …”