Catalytic activity of Au/Fe-PILC and Au/Fe-oxide catalysts for catalytic combustion of formaldehyde

摘要

Iron polymeric hydroxygroups pillared clays (Fe-PILC) were prepared by Na+-montmorillonite with iron pillaring agent.2.01Au/Fe-PILC catalyst was obtained by deposited-precipitation (DP) method.2.52Au/Fe-oxide catalyst was prepared by co-precipitation method.The catalytic activity of these catalysts was measured by catalytic combustion of formaldehyde.The catalyst of 2.01Au/Fe-PILC exhibits the high catalytic activity.The catalytic combustion reaction of formaldehyde proceeds at considerable rates at 20 °C and complete burn-off of formaldehyde is achieved at 120 °C.The structure of catalysts,the valence state of gold and the size of gold particles were investigated by means of X-ray powder diffractometry,X-ray photoelectron spectroscopy and transmission electron microscopy.The results show that gold atoms with partially positive charge exist in the catalyst and play an important role in the catalytic activity.In addition,nano-sized,well-dispersed gold particles and good adsorption properties of support are necessary to obtain high activity Au catalysts for catalytic combustion of formaldehyde.