Hydrogen-Rich Gas Production by Steam Reforming and Oxidative Steam Reforming of Methanol over La_0.6Sr_0.4CoO_3−δ: Effects of Preparation, Operation Conditions, and Redox Cycles

Abstract

La 0.6 Sr 0.4 CoO 3−δ (LSC) perovskite, as a potential catalyst precursor for hydrogen (H 2 )-rich production by steam reforming of methanol (SRM) and oxidative steam reforming of methanol (OSRM), was investigated. For this purpose, LSC was synthesized by the citrate sol−gel method and characterized by complementary analytical techniques. The catalytic activity was studied for the asprepared and prereduced LSC and compared with the undoped LaCoO 3−δ (LCO) at several feed gas compositions. Furthermore, the degradation and regeneration of LSC under repeated redox cycles were studied. The results evidenced that the increase in the water/methanol ratio under SRM, and the O 2 addition under OSRM, increased the CO 2 formation and decreased both the H 2 selectivity and catalyst deactivation caused by carbon deposition. Methanol conversion of the prereduced LSC was significantly enhanced at a lower temperature than that of as-prepared LSC and undoped LCO. This was attributed to the performance of metallic cobalt nanoparticles highly dispersed under reducing atmospheres. The reoxidation program in repetitive redox cycles played a crucial role in the regeneration of catalysts, which could be regenerated to the initial perovskite structure under a specific thermal treatment, minimizing the degradation of the catalytic activity and surface.

Ru-Ce0.7Zr0.3O2−δ as an Anode Catalyst for the Internal Reforming of Dimethyl Ether in Solid Oxide Fuel Cells

“…Finally, the samples were dried at 120 • C in air and calcined at 500 • C for 2 h in air. The detailed descriptions of the above synthesis procedures can be found in a previous study [42].…”

“…The outlet gas of catalysts was analysed using online gas chromatography (Agilent Micro GC 3000, Santa Clara, CA, USA). The additional details of the experimental setup can be found in a previous study [42]. The DME conversion and the selectivity of H 2 and C-containing products (CO, CO 2 , and CH 4 ) were calculated according to the following Equations ( 2…”

Modulating the active phase in perovskite LaCoO3 with B-site doping of Cu for efficient methanol reforming to produce hydrogen

“…Methanol serves as an optimal carrier for chemical hydrogen storage due to its high hydrogen storage density, H/C ratio and mild hydrogen conversion conditions. 1 Hydrogen production through methanol steam reforming (MSR) is a promising strategy to solve the future energy challenges. Catalysts play a critical role in methanol steam reforming (MSR) by accelerating reaction rates and enhancing hydrogen output.…”