Insights into the stability of the iron oxide immobilized into mesoporous silica catalysts in iodine–sulfur cycle for hydrogen production

O-Vacancy Mediated Partially Inverted Ferrospinels for Enhanced Activity in the Sulfuric Acid Decomposition for Hydrogen Production

“…In order to develop a highly active and thermally stable catalyst, several efforts have been made in the past using precious metal groups, transition metal oxides, and complex metal oxides (perovskites and spinels). − Among all, supported transition metal oxides and complex metal oxides are found to be potential alternatives to precious metal oxides due to their low cost and better stability. ,− Although platinum-based catalysts are better catalysts, metal loss is one of the major concerns. , In this regard, transition-metal-oxide-based catalysts supported over SiO 2 , Al 2 O 3 , and other support materials have been extensively explored in the literature and shown to be potential candidates for sulfuric acid decomposition. ,,, However, these transition metal oxides exhibit poor thermal stability. Therefore, complex metal oxides such as perovskites and spinels seem to be a better alternative to platinum-based catalysts due to their high thermal stability, particularly at high temperatures.…”

“…35,36 In this regard, transition-metaloxide-based catalysts supported over SiO 2 , Al 2 O 3 , and other support materials have been extensively explored in the literature and shown to be potential candidates for sulfuric acid decomposition. 18,33,37,38 However, these transition metal oxides exhibit poor thermal stability. Therefore, complex metal oxides such as perovskites and spinels seem to be a better alternative to platinum-based catalysts due to their high thermal stability, particularly at high temperatures.…”