Hydrogen-rich gas production by steam reforming and oxidative steam reforming of methanol over La[sub]0.6sr[sub]0.4CoO[sub]3-d: effects of preparation, operation conditions, and redox cycles

Morales, M. ; Laguna-Bercero, M. Á. ; Jiménez-Piqué, E.

Resumen: La0.6Sr0.4CoO3−δ (LSC) perovskite, as a potential catalyst precursor for hydrogen (H2)-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 as-prepared and prereduced LSC and compared with the undoped LaCoO3−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 O2 addition under OSRM, increased the CO2 formation and decreased both the H2 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.

Idioma: Inglés

DOI: 10.1021/acsaem.3c00778

Año: 2023

Publicado en: ACS applied energy materials 6, 15 (2023), 7887-7898
ISSN: 2574-0962

Factor impacto JCR: 5.5 (2023)

Categ. JCR: CHEMISTRY, PHYSICAL rank: 55 / 178 = 0.309 (2023) - Q2 - T1
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 116 / 439 = 0.264 (2023) - Q2 - T1
Categ. JCR: ENERGY & FUELS rank: 64 / 171 = 0.374 (2023) - Q2 - T2

Factor impacto CITESCORE: 10.3 - Electrochemistry (Q1) - Chemical Engineering (miscellaneous) (Q1) - Materials Chemistry (Q1) - Energy Engineering and Power Technology (Q1) - Electrical and Electronic Engineering (Q1)

Factor impacto SCIMAGO: 1.467 - Electrical and Electronic Engineering (Q1) - Electrochemistry (Q1) - Materials Chemistry (Q1) - Chemical Engineering (miscellaneous) (Q1) - Energy Engineering and Power Technology (Q1)

Financiación: info:eu-repo/grantAgreement/ES/AEI/PID2019-107106RB-C32

Tipo y forma: Article (Published version)