Fig. 1: Stable and reusable NOx removal system during NH3-SCR reaction with SO2.
From: Simple physical mixing of zeolite prevents sulfur deactivation of vanadia catalysts for NOx removal
a Schematic of two types of deactivation by sulfur species. b Comparison of SO2 resistance of VWTi + Z catalyst to VWTi and common low temperature catalysts (Cu-SSZ-13 and Mn/TiO2). The catalysts were aged under 500 ppm NO, 600 ppm NH3, 10% O2, 5% CO2, 10% H2O, and 30 ppm SO2 balanced with N2. c Regeneration and reusability test of the VWTi+Z system until the third operation. Regeneration gas contains 10% O2, 5% CO2, and 10% H2O balanced with N2. d Deactivation rate of the catalysts during SO2 aging. Deactivation rates of the VWTi and VWTi+Z were obtained by linear fits of 22 h aging profiles and those of the Cu-SSZ-13 and Mn/TiO2 were calculated from initial 2 h aging data.
