SnO2/Fe2O3 nanocomposites:: Ethanol-sensing performance and catalytic activity for oxidation of ethanol
Year: 2006
Authors: Kovalenko V.V., Rumyantseva M.N., Gaskov A.M., Makshina E.V., Yushchenko V.V., Ivanova I.I., Ponzoni A., Faglia G., Comini E.
Autors Affiliation: Moscow MV Lomonosov State Univ, Fac Chem, Moscow 119992, Russia; Univ Brescia, Dipartimento Chim & Fis, Sensor Lab, CNR INFM, I-25133 Brescia, Italy.
Abstract: SnO2/Fe2O3 nanocomposites have been prepared over the entire composition range (0-100 mol % Fe2O3) through precipitation from solution, and their ethanol-sensing performance (10-200 ppm C2H5OH) was evaluated using electrical conductivity measurements in the temperature range 150-450 degrees C. The sensing performance of the nanocomposites is shown to strongly depend on their composition. The Fe2O3-rich (> 70 mol % Fe2O3) nanocomposites offer a large C2H5OH response and low sensitivity to ambient humidity. The oxidizing and acid properties of the nanocomposites have been studied using temperature-programmed hydrogen reduction and ammonia desorption measurements, and their catalytic activity for oxidation of ethanol was assessed by gas chromatography mass spectrometry in a flow system. The results indicate that increasing the Fe2O3 content of the nanocomposites reduces the density of acid centers on their surface and enhances their activity for oxidation of ethanol.
Journal/Review: INORGANIC MATERIALS
Volume: 42 (10) Pages from: 1088 to: 1093
KeyWords: Gas-sensitive Properties; Iron-oxide; ThinDOI: 10.1134/S0020168506100074Citations: 22data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-10-20References taken from IsiWeb of Knowledge: (subscribers only)