Catalytic oxidation of formaldehyde on iron ore tailing

Raw powder of iron ore tailing, the catalyst prepared by impregnation approach and the modified catalyst loaded Ag+ were investigated for catalytic oxidation of formaldehyde. Prepared materials were characterized by XRD, XRF and BET surface area. Experiments of catalytic activity were carried out in an electrically heated fixed-bed reactor in which 1.0 g of catalyst mixed fully with 10 g quartz sand was added. 200 ppm of formaldehyde gas was introduced into the reactor at a space velocity of 30,000 ml/g.h. Effects of reaction temperature and calcination temperature were considered. The results show that formaldehyde catalytic efficiencies of all materials increase with the increase of reaction temperature. Furthermore, the catalytic efficiency was enhanced when Ag+ loaded on the support. Physical properties of raw powder are unsatisfied, but 67% of formaldehyde catalytic efficiency was obtained at the reaction temperature of 100 degrees C which is far higher than that of other prepared catalysts. (C) 2016 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.