Silica-supported silver catalysts modified by cerium/manganese oxides for total oxidation of formaldehyde

Silica-supported silver catalysts modified by cerium/manganese oxides were studied as catalysts for total oxidation of formaldehyde. The catalysts were characterized by N-2 adsorption, XRD, and H-2-TPR methods. Catalytic activity of the samples was tested in a flow fixed-bed reactor at atmospheric pressure and 100-200 degrees C using a feed gas containing 10,000-22,000 ppm of formaldehyde with a flow rate corresponding to a WHSV of similar to 69,000 mL/(g(cat) h). It was shown that combination of silica support and a small amount of cerium/manganese oxides allows developing silver catalysts with defined micro- and macrostructure as well as high activity in the total oxidation of formaldehyde. (C) 2013 Elsevier B.V. All rights reserved.