Influence of calcination temperature on thestructure and catalytic performance of Au/iron oxide catalysts for water-gas shift reaction

摘要

This paper reports a sutdy on the influence of clacination temperature on tehcatalytic behavior of the Au/iron oxide systems in the water-gas shift reaction.The catalytic activity has been found to be strongly dependent on the catalyst pretreatment,decreasing on increasing the calcinaton temprture.Detailed characterizaton ofthe uncalcined and the calcined sample at different temperatures,employing BET analysis,XRD,H_2-TPR,HRTEM and XPS,has shown that the catalytic behavior os related to the gold state and/or the particle size and the properties and structure of iron oxid esuppot.Both the oxidation state and dispersion f gold and the phase transition and its crystallinity and reductive property ofthe support exert gret influence on the catalytic performance of the gold/metal oxide.The wave of the activity with in gold species and the active magnetite phase.