Effect of Nickel and Cobalt Doping on the Redox Performance of SrFeO_3−δ toward Chemical Looping Dry Reforming of Methane

Abstract

The low-content metal dopant in the oxides has a beneficial effect on the redox performance of these materials. However, the role of dopants remains elusive. Herein, SrFeO 3−δ perovskites with low-content Ni or Co were investigated as oxygen carriers (OCs) for chemical looping dry reforming of methane. Compared with pristine SrFeO 3−δ , the doped ones show an accelerated transition phase in the reduction step. As a result, doping causes an increase in both methane conversion and amount of lattice oxygen consumption. Among the OCs, SFO/01Ni with a Ni/Sr mole ratio of 0.001 exhibits superior performance. The possible mechanism for the optimal SFO/01Ni is linked to the synergistic effect between the enhanced migration of lattice oxygen and the improved catalytic performance resulted from the reduced metal particles and anchored Ni particles. In 20 tailored redox cycles at 900 °C, the productivity of H 2 and CO over SFO/01Ni is always twice as high as that over SFO and SFO/01Co, suggesting that SFO/01Ni may sustain the periodically structural change in the bulk under the harsh reaction conditions. These findings advance the understanding of the role of non-noble dopants in methane oxidation over perovskites and may greatly inspire the rational OC design and exploration for chemical looping reforming.

Review and Outlook of Confined Ni Catalysts for the Dry Reforming of Methane Reaction

“…If Ni nanoparticles were confined by chemical force, such as Ni atoms in the lattice of the oxides or in the framework of the zeolites, the confinement effect can be enhanced. For example, perovskite catalysts containing Ni possessed higher anti-sintering resistance than traditional supported catalysts, ,− and zeolite catalysts incorporating Ni always exhibited greater DRM performance and less carbon deposition. − In contrast to the wide investigation on perovskite catalysts, the zeolite catalysts were relatively rare. Considering the future industrial application, the zeolite catalysts were more promising.…”

Carbon Dioxide Capture and Hydrogen Production with a Chemical Looping Concept: A Review on Oxygen Carrier and Reactor

“…To achieve the above goals, CO 2 should first be converted into CO and then produce various organic compounds through methanol synthesis, Fischer–Tropsch, etc. The reforming of CO 2 can be completed by using the chemical looping dry reforming (CLDR) technology to realize the simultaneous production of syngas (H 2 /CO = 2) and CO. , Compared to coal-based production methods, the CLDR process reduces energy requirements by ∼68%, and has almost zero net CO 2 emissions …”

The ex situ exsolved Ni–Ru alloy from nickel–ruthenium co-doped SrFeO3−δ perovskite as a potential catalyst for CC and CO hydrogenation

“…Literature survey reveals that the substitution of a small quantity of Ni to SrFeO 3− δ has been reported to yield positive outcomes in terms of chemical looping and dry reforming of methane. 17 Furthermore, the introduction of two distinct ions at the B site through doping has been found to enhance the activity even further, resulting in synergistic effects. This approach serves as a remarkable catalyst design strategy.…”