Catalytic activity of Pt and tungstophosphoric acid supported on MCM-41 for the reduction of NOx in the presence of water vapor

The catalytic activity of tungstophosphoric acid and Pt loaded MCM-41 for t he catalytic reduction of NOx with propene in the presence of water vapor w as studied. Pt/MCM-41 was found to be most active, the loading with H3PW12O 40 led to an improved selectivity to N-2 formation and to an enhanced activ ity in the presence of water vapor. Hydrated tungstophosphoric acid generat ed additional sorption sites fur C3H6 and led to a higher local concentrati on of the reducing agent on the catalyst surface, which was found to increa se the activity of the Pt and H3PW12O40 loaded catalysts in the presence of water vapor. (C) 2000 Elsevier Science B.V. All rights reserved.