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.
SnO2/Fe2O3 nanocomposites: Ethanol-sensing performance and catalytic activity for oxidation of ethanol
Ponzoni A;
2006
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
