A honeycomb catalyst for simultaneous NO and SO2 removal from flue gas:: preparation and evaluation

A honeycomb catalyst is prepared by supporting CuO and Na2O on an Al2O3-coated cordierite ceramic for simultaneous SO2 and NO removal from flue gas at 400 degreesC. Results show that (1) acid treatment of the substrate (cordierite ceramic) plays an important role in enhancing the catalytic activities; (2) coating of Al2O3 on the substrate shows an obvious promoting effect on both SO2 and NO removal; (3) Na2O addition significantly improves SO2 removal activity but inhibits the selective catalytic reduction (SCR) activity of NO with NH3. A catalyst containing 8.0 wt.% Cu, 2.0 wt.% Na and 21 wt.% Al2O3 on the acid-washed cordierite ceramic shows good activities and stability in continued reaction-regeneration cycles, with a steady sulfur capacity of 4.4 wt.% and steady-state NO conversion of about 90% at 400 degreesC and a space velocity of 2800 h(-1). (C) 2004 Elsevier B.V. All rights reserved.