Catalytic properties of BaMAl11O19-α (M = Cr, Mn, Fe, Co, and Ni) for high-temperature catalytic combustion

Synthesis of lamp phosphors: facile combustion approach

Effect of structural modification on the catalytic property of Mn-substituted hexaaluminates

Influence of M2+ ions substitution on the structure of lanthanum hexaaluminates with magnetoplumbite structure

Several samples of TiO2 (anatase)-supported Mn oxide XMn–TiO2 (with X = 0.5, 1.0, 1.5 and 2.0, the theoretical monolayer fractions) have been prepared by a wet impregnation method and characterised by conventional techniques. Mn oxide was found to be well dispersed on the support surface as Mn3+species, while part of it is stabilised into the TiO2 bulk as Mn4+species. This cation seem to hinder the support sintering and to favour the anatase to rutile phase transition at higher temperatures. Mn oxides supported on TiO2 are stable and retain medium-high surface area in the 600–900 K range. They are less active than pure Mn oxides in the isopropanol oxidation but, above 600 K, allow complete oxidation of isopropanol to CO2 only. FT–IR studies and the GC–MS analysis of some intermediate products allow us to confirm the 2-propanol total oxidation occurs through the previously proposed 2-propoxide/acetate/formate surface pathway.

A.M. Lejus

Papers

Optical and ESR investigations of lanthanum aluminates LaMg1−xMnxO19 single crystals with magnetoplumbite-like structure

Elaboration et proprietes magnetiques de monocristaux d'oxyde de praseodyme Pr2O3