WITHDRAWN: Novel Vanadium supported onto mixed Molybdenum-Titanium Pillared Clay catalysts for the low temperature SCR-NO by NH3

Abstract

Abstract New vanadium supported onto mixed molybdenum-titanium pillared clay catalysts “V/(Mo-Ti)-PILCs” with variable quantities of Mo were investigated for the low temperature SCR-NO by NH 3 . The (Mo-Ti)-PILC supports, prepared by co-intercalation route, and the V/(Mo-Ti)-PILC catalysts, obtained by the impregnation method, have been characterized by means of XRD, N 2 adsorption-desorption, IR-spectroscopy, NH 3 -TPD and H 2 -TPR. The results have shown the success of the intercalation process through the increase of the basal spacing, the surface area and the porosity of the clay. The simultaneous incorporation of Mo-Ti cationic species and the vanadium deposition have successfully modified the acidic and the redox properties of the pillared materials. In SCR-NO by NH 3 , the NO conversion was significantly increased, especially at low temperature, after the addition of vanadium. Over the catalyst containing 4 wt% of Mo and 2 wt% of V, NO conversion reached 50% at around 250 °C and exceeded 85% at 400 °C with 100% N 2 selectivity. For higher Mo content (8 wt%), N 2 O formation, in trace amount, was observed above 375 ° C.