Combined removal of SO2 and NO using sol-gel-derived copper oxide coated alumina sorbents/catalysts.
The present paper reports experimental results on the removal of sulfur dioxide and nitrogen oxide from simulated flue gas using a copper oxide coated on alumina sorbent/catalyst prepared by the sol-gel method. Selective catalytic reduction of nitric oxide by ammonia over sol-gel derived CuO/gamma-Al2O3 sorbents/catalysts with different degrees of sulfation was studied in a fixed-bed packed reactor. The optimum temperature for NO reduction was found at 350 degrees C for both fresh and sulfated catalysts. The properties for simultaneous removal of SO2 and NO by the sol-gel-derived CuO/gamma-Al2O3 sorbents were studied using simulated dry flue gas. The optimum operating temperature for the combined deSO2/deNO operations was identified at 350 degrees C. At the space velocity of 5200 h(-1) and 350 degrees C, a fixed-bed reactor packed with the 7.9 wt% CuO/gamma-Al2O3 sorbent prepared by the sol-gel method offers SO2 sorption capacity of 2.3 mmol g(-1) and NO conversion of 92% with a dry simulated flue gas as the feed. Under these experimental conditions, the sol-gel derived sorbents/catalysts have comparable efficiency for removal of SO2 and NOx as their commercial counterparts. The significantly higher crush strength of the sol-gel derived sorbents/catalysts make them very promising for their use in the copper oxide process for combined removal of SO2 and NOx from flue gas in a single unit operation.
Sandia National Laboratories, Chemical and Biological Technologies Department, P.O. Box 5800, MS 0734, Albuquerque, NM 87185-0734, USA.
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D000042:Absorption; D000393:Air Pollutants / Q000302:isolation & purification*; D000397:Air Pollution / Q000517:prevention & control*; D000537:Aluminum Oxide / Q000737:chemistry; D002384:Catalysis; D003300:Copper / Q000737:chemistry*; D009589:Nitrogen Oxides / Q000737:chemistry / Q000302:isolation & purification*; D013458:Sulfur Dioxide / Q000737:chemistry / Q000302:isolation & purification*; D013696:Temperature
D000393:Air Pollutants; D009589:Nitrogen Oxides; D013458:Sulfur Dioxide; D003300:Copper; D000537:Aluminum Oxide; C030973:cupric oxide