Cr-doping regulates Mn3O4 spinel structure for efficient total oxidation of propane: Structural effects and reaction mechanism determination

Recent advances and future challenges in the catalytic combustion of light hydrocarbon VOCs

“…17(c), indicating that C–H bonds of propane are more likely to break on the Mn 3 O 4 –Cr surface. 154 Similarly, by comparing the methane adsorption energy of Co 2 NiO 4 of Pd–Co 2 NiO 4 catalysts with that of pure Co 2 NiO 4 catalysts, Xiong et al found that the presence of PdO improves the electronic properties of Co 2 NiO 4 , thereby enhancing the adsorption of methane molecules by Co 2 NiO 4 of Pd–Co 2 NiO 4 catalysts. 46 This illustrates metal–support interactions in terms of reaction kinetics.…”

“…Feng et al , by comparing the formation energy of oxygen vacancies, found that the doping of Cr was conducive to reducing the formation energy of oxygen vacancies on Mn 3 O 4 spinel catalysts, thus increasing the number of oxygen vacancies on the catalyst. 154 Consequently, the oxygen activation ability of the Mn x Cr 3− x O 4 catalyst was enhanced, and ultimately the propane oxidation performance of the catalyst was improved. Accordingly, the construction of catalysts enriched with oxygen vacancies based on oxygen reaction kinetics is also a well-used strategy to enhance the catalytic activity of light hydrocarbons.…”

“…Feng et al improved the catalytic performance of Mn 3 O 4 spinel catalysts by incorporating Cr into the catalyst. 154 Due to the synergistic interaction between Mn and Cr, more Mn 4+ species are available on the Mn x Cr 3− x O 4 catalyst, which is the active site for propane conversion. Also, it shows that partial replacement of Fe 3+ with Co 3+ at the B-site and La 2+ with Sr 2+ at the A-site of LaFeO 3 perovskite could reduce the formation energy of oxygen vacancies on the catalyst, which enhanced the concentration of oxygen vacancies and thus promoted the complete oxidation of methane.…”

“…136 Also, Cr was doped on Mn 3 O 4 spinel to construct Mn x Cr 3− x O 4 composite spinel oxides. 154 In particular, the Mn 2.70 Cr 0.30 O 4 spinel showed outstanding catalytic performance in propane catalytic combustion, and its T 90 was 264 °C under wetting conditions, which was 51 °C lower than that of Mn 3 O 4 spinel. This is mainly attributed to the synergistic interaction between Cr–Mn to facilitate the formation of Mn 4+ species and the improvement of low-temperature reducibility and oxygen mobility.…”

“…Its catalytic performance is usually improved by doping with other metals. 136,154,155 A series of ZrO 2 -modied Co 3 O 4 spinel oxides with different compositions were prepared and tested for methane catalytic combustion. The results showed that the introduction of appropriate Zr facilitates the enhancement of methane catalytic activity of the catalysts.…”