Catalyst For Direct Oxidation Research Articles

Catalysts for direct oxidation fuel cells

Catalysts for direct oxidation fuel cells

Vanadium-molybdenum phosphates supported by TiO2-anatase as new catalysts for selective oxidation of ethane to acetic acid

Dispersion of vanadium and molybdenum phosphates on titanium oxide (anatase) below the monolayer gives good catalysts for direct oxidation of ethane to acetic acid. By comparison with the dispersion of only vanadium phosphate, the higher selectivity to acetic acid for vanadium and molybdenum phosphates has been explained by an interaction between molybdenum and vanadium as it can be deduced from electron spin resonance and laser Raman spectroscopy studies.

Catalytic Properties of ZSM-5 Zeolites in N2O Decomposition: The Role of Iron

Abstract Ferrisilicate analogues of ZSM-5 zeolite have been found to be efficient catalysts for direct oxidation of benzene to phenol using dinitrogen monoxide as an oxidant. The reaction of N 2 O decomposition over these catalysts has now been studied. Specific active sites (referred to as α-sites) consisting of Fe atoms have been shown to be responsible for catalytic properties of ferrisilicates. Decomposition of N 2 O on α-sites generates a reactive form of surface oxygen which cannot be produced by O 2 adsorption. The concentration of α-sites and the rate of N 2 O decomposition as functions of iron content over the wide range of its concentrations (from 0.003 to 4.8 wt% Fe 2 O 3 ) have been studied. When comparing these data with the previous results for ZSM-5 zeolites of ferrialuminosilicate composition, the properties of α-sites have been shown to be identical in both systems. The superior activity of Fe-Al-Si samples to that of Fe-Si samples is accounted for by a higher concentration of α-sites in the former at the same iron content, caused by the favourable influence of Al on Fe distribution throughout the zeolite matrix.