Improvement of Water-, Sulfur Dioxide-, and Dust-Resistance in Selective Catalytic Reduction of NOx with NH3 Using a Wire-Mesh Honeycomb Catalyst

A novel V2O5/WO3/TiO2/Al2O3/wire-mesh honeycomb (WMH) catalyst was prepared for selective catalytic reduction (SCR) of NOx with NH3. The resistances to H2O, SO2, and dust were investigated for the WMH catalyst, which were compared with those for ceramic honeycomb (CH) catalysts. The results showed that the WMH catalyst kept above 95% NOx conversion in the broad temperature window (250-425 degrees C) and provided nearly 92% NOx conversion during H2O and SO2 durability test, which might be attributed to the unique three-dimensional structure. Furthermore, the WMH catalyst could provide nearly 90% NOx conversion during 40 h dust exposure experiment owing to the little dust deposition of 2.9 g/m(2), whereas the amount of dust deposited on the CH catalyst with the same cell density reached 6.7 g/m(2), which resulted in a decrease of the NOx conversion from 72% to 58%.