Catalytic performance and kinetics of wire-mesh honeycomb catalyst for reduction of NO with NH3.

Abstract

V2O5/TiO2/Al2O3 catalysts with wire-mesh honeycomb (WMH) structure were prepared with three sequent steps: anode oxidation, sol-gel process and impregnation, and used for selective catalytic reduction (SCR) of nitric oxide (NO) with ammonia (NH3). According to the results of BET specific surface area (S(BET)), X-ray diffraction (XRD), and energy-dispersive X-ray analysis (EDX), the effective V2O5/TiO2/Al2O3 structure was formed on the surface of aluminum mesh. The catalytic activity was examined, and the results showed that the excellent treatment efficiency of WMH catalyst was obtained when the temperature was in the range of 473 to 673 K. The NO conversion rate was 86% at 673 K when the space volocity (SV) was 5000 h(-1), the NO conversion rate was both enhanced when increasing NH3/NO ratio or influent NO concentration. The kinetic analysis showed that the catalytic reaction followed pseudo-first-order kinetic model, the SCR reaction depended on chemical kinetics at low temperature (T < 493 K) and mass transfer at high temperature (T > 513 K).