Influence of Steam and Sulfide on High Temperature Selective Catalytic Reduction

Abstract

The influences of steam and sulfide on the efficiency of NOx reduction using ammonia (NH 3 ) over the nanometer-class V-W/Ti catalyst in conditions of high temperature is experimentally investigated using a steady-flow reactor. The results showed that selective catalytic reduction (SCR) is inhibited by H 2 O at low temperature, but higher NO conversion efficiency is achieved at high temperature since the reaction of NH 3 oxidized by O 2 to NOx is inhibited by H 2 O. The activity of SCR is promoted by SO 2 in the temperature range of 200~500°C , the NO conversion efficiency was improved to 98% from 94% by adding SO 2 . SCR would be improved at 350~500°C when H 2 O and SO 2 exist at the same time. Furthermore, the positive influence to the NOx conversion was proved in the presence of H 2 O and SO 2 as a result of the European Stationary Cycle test.

Thermal Analysis by Means of Differential Scanning Calorimetry of the Characteristic Thermodynamic Temperatures of a Cu-Zr-Al Bulk Metallic Glass

“…The measurement results will not only be affected by the material state, but also by other factors including experimental conditions. Results that are obtained under different test conditions may contain significant errors [13].…”