Buelna G, Lin Y S
Sandia National Laboratories, Chemical and Biological Technologies Department, P.O. Box 5800, MS 0734, Albuquerque, NM 87185-0734, USA.
Environ Technol. 2003 Sep;24(9):1087-95. doi: 10.1080/09593330309385649.
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.
本文报道了使用通过溶胶 - 凝胶法制备的负载在氧化铝吸附剂/催化剂上的氧化铜从模拟烟道气中去除二氧化硫和氮氧化物的实验结果。在固定床填充反应器中研究了氨在不同硫酸化程度的溶胶 - 凝胶衍生的CuO/γ - Al₂O₃吸附剂/催化剂上对一氧化氮的选择性催化还原。对于新鲜催化剂和硫酸化催化剂，发现NO还原的最佳温度均为350℃。使用模拟干烟道气研究了溶胶 - 凝胶衍生的CuO/γ - Al₂O₃吸附剂同时去除SO₂和NO的性能。确定了联合脱硫/脱硝操作的最佳操作温度为350℃。在5200 h⁻¹的空速和350℃下，填充有通过溶胶 - 凝胶法制备的7.9 wt% CuO/γ - Al₂O₃吸附剂的固定床反应器，以干模拟烟道气为进料时，SO₂吸附容量为2.3 mmol g⁻¹，NO转化率为92%。在这些实验条件下，溶胶 - 凝胶衍生的吸附剂/催化剂去除SO₂和NOₓ的效率与市售同类产品相当。溶胶 - 凝胶衍生的吸附剂/催化剂显著更高的抗压强度使其在用于在单个单元操作中从烟道气中联合去除SO₂和NOₓ的氧化铜工艺中非常有前景。
