Reactivity of simple alcohols on Fe2O3powders An XPS and FTIR study

Abstract

he interaction between powders and methanol, ethanol, propan-1-ol and butan-1-ol has been studied by means of a-Fe 2 O 3 FTIR and XPS. Mass spectrometry has been used to characterise the volatile products. Methanol is chemisorbed mainly dissociatively whereas molecular chemisorption is prevalent in higher alcohols. When methanol is chemisorbed, heating induces the formation of formate (at temperatures [400 K) while hydrocarbons are the main products (at temperatures [500 K) of the other alcohols. Considerations are made concerning surface acidic sites in connection with the thermal treatment of the sample and with alcohol chemisorption.

Catalytic oxidation of trichloroethylene over Fe-ZSM-5: Influence of the preparation method on the iron species and the catalytic behavior

“…As shown in Fig. 11A, the Fe 2p peak of fresh catalyst had only one signal at 710.2 eV, which corresponds to Fe 2 O 3 [45,46]. In the characteristic chloride region of this catalyst, no signal was observed.…”

Proton conductivity and methanol rejection by ceramic membranes derived from ferroxane and alumoxane precursors

“…In direct methanol fuel cell applications, electrolytes are under constant exposure to methanol fuel. Methanol can be adsorbed on metal oxide surfaces by molecular physisorption and dissociative chemisorption [38][39][40]. Although the adsorption strength of methanol on metal oxide was found to be smaller than acetic acid [40], it would be interesting for future studies to understand the effect of methanol adsorption and methanol concentration on protonic conductivity of metal oxides.…”

A study of the catalytic activity and sensitivity to different alcohols of CeO2–Fe2O3 thin films

“…By taking into account the reactivity studies here reported and literature data, we can suppose that alcohols oxidation occurs through a first step where adsorbed molecules on the oxide surface decompose in alkoxy groups (RO ads ) after hydrogen extraction [2,12,13,18]. These surface species react with adsorbed oxygen (for example O ads − ) to give CO 2 as follows:…”