Inhibition Effect of HO on the Heterogeneous Reaction between Isoprene and Fe-Substituted Cryptomelane.

The transportation and transformation of biogenic isoprene are vital for the organic carbon cycle in the troposphere. As a typical mineral with high oxidation potential, Fe-substituted cryptomelane oxidizes the surface monolayer of isoprene into formic and acetic acids, and simultaneously, the Mn ions in the structure are reduced to Mn and Mn. The flow of HO in isoprene decreases the adsorption and oxidation of isoprene significantly, even at low relative humidity (10%).

Ca substitution improves the catalytic activity of perovskite LaCoO toward toluene: comprehension of electronic structure alteration.

For perovskite LaCaCoO (Ca-, = 0-0.3), Ca-0.2 with the closest O p band center to the Fermi level, displays the best catalytic activity for toluene oxidation.

The variation of cationic microstructure in Mn-doped spinel ferrite during calcination and its effect on formaldehyde catalytic oxidation.

In this study, a series of Mn substituted spinel ferrites calcinated at different temperatures were used as catalysts for the oxidation of formaldehyde (HCHO). X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy and H2 temperature-programmed reduction were conducted to characterize the structure and physico-chemical properties of catalysts, which were affected by calcination in the range of 200-600°C. Results show that all the ferrites were with spinel structure, and those calcinated in the range of 300-600°C were in the phase of maghemite.