摘要
研究了用CuO/γ Al2 O3 催化剂同时脱除烟气中的SO2 和NO ,并在固定床反应器中考察了反应条件对其催化活性的影响 .结果表明 ,温度和SO2 对CuO/γ Al2 O3 的催化活性均具有双重影响 .新鲜催化剂和硫化催化剂上最适宜的脱硝温度分别为 2 5 0～ 30 0℃和 30 0～ 4 5 0℃ ,最适宜的n(NH3) /n(NO) 约为 1 2 .烟气中的氧可大大提高CuO/γ Al2 O3 的脱硫脱硝活性 .综合考虑吸附硫容和NO脱除率 ,CuO/γ Al2 O3 同时脱硫脱硝的最适宜温度为 35 0～ 4 5 0℃ .温度和SO2 在高温区对CuO/γ Al2 O3 活性的影响源于两者对NH3 氧化活性的改变 ,高温下CuO/γ Al2 O3 的活性下降是因为NH3 氧化加剧 ;SO2 通过使催化剂硫化生成硫酸盐来抑制NH3 氧化 ,从而提高CuO/γ Al2 O3 的活性 .吸硫饱和的催化剂可于 5 %NH3 中还原再生 ,再生后其硫容较初始时降低 。
Selective catalytic reduction (SCR) of NO and simultaneous removal of SO 2 and NO over CuO/γ Al 2O 3 catalyst were performed in a fixed bed reactor. The optimum temperature ranges for SCR of NO over the fresh and sulfated CuO/γ Al 2O 3 catalyst samples are 250～300 ℃ and 300～450 ℃, respectively, and the optimum n (NH 3) / n (NO) is about 1 2. Oxygen in the flue gas shows promotive effect on SCR of NO and removal of SO 2. The optimum temperature range for simultaneous removal of SO 2 and NO is 350～450 ℃. Effects of temperature and SO 2 on SCR of NO over CuO/γ Al 2O 3 catalyst in high temperature range are attributed to the changes in ammonia oxidation. Compared with individual removal of NO, simultaneous removal of NO and SO 2 is beneficial because the sulfates formed during sulfation reduce the ammonia oxidation and result in the increase of SCR of NO. After reductive regeneration in ammonia, the catalyst shows higher catalytic activity for SCR of NO than the fresh one.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2004年第1期33-38,共6页
基金
国家高技术研究发展计划 (863计划)资助项目(2 0 0 2AA5 2 9110 )
国家自然科学基金资助项目(2 0 2 760 78)
中国科学院知识创新基金资助项目
山西省自然科学基金资助项目(9810 19)
关键词
氧化铜
氧化铝
烟气
二氧化硫
氧化氮
氧
脱硫
脱硝
copper oxide,alumina, flue gas, sulfur dioxide, nitric oxide, oxygen, removal of sulfur dioxide, removal of nitric oxide
