ARGOMENTO: Transition metal oxide catalysts as an alternative

Transition metal oxide catalysts as an alternative for the oxidation


Background The oxidation of NO to NO2 is a key step in environmental pollution abatement techniques, such as the “fast-SCR” or the diesel engines catalytic traps. In both cases, the conversion of an important fraction of NO into NO2 is a key step. In this work, two commercially available transition metal oxide catalyst, CuMn and CuCr-based, are studied as an alternative to noble metal catalysts (a Pt/Al2O3 catalyst is used as reference catalyst).ResultsSteady NO conversion is obtained after the first 1–2 h of operation. Get more news about Oxide Deoxidizing Catalyst,you can vist our website!
The experiments, carried out in an isothermal fixed-bed reactor operating at high space velocities (5.60 gcat min mol−1, GHSVmonolith-eq. = 83 000 h−1) with 500 ppm NO and 20% oxygen, showed that the optimum operating temperature is 380 °C for the CuMn catalyst, 430 °C for the CuCr catalyst and 366 °C for a 0.5% Pt/Al2O3 catalyst.Conclusions The CuMn catalyst performed very similar to the 0.5% Pt/Al2O3 catalyst in the vicinity of 380 °C, being a good and cheaper alternative to noble metal catalysts. The kinetic measurements obtained at different conditions, e.g. 3.73-5.60 gcat min mol−1 (GHSVmonolith-eq. = 83 000–125 000 h−1), 300–900 ppm NO, 1-20% oxygen concentration and 330-480 °C, have been found to fit a mechanistic kinetic model based on the reaction between gas nitrogen oxide and adsorbed oxygen.