半焦负载钙和铁催化还原NO的研究  

Catalytic Reduction of NO by Chars Loaded with Ca and Fe

作　　者：赵宗彬[1] 李文[1] 李保庆[1] 

机构地区：[1]中国科学院山西煤炭化学所煤转化国家重点实验室,太原030001

出　　处：《环境科学》2001年第5期17-20,共4页Environmental Science

基　　金：国家自然科学基金资助项目 (2 9876 0 47);国家自然科学重点基金资助项目 (2 9936 0 90 )

摘　　要：用浸渍法制备负载Ca和Fe的褐煤半焦 ,采用程序升温和恒温法在石英固定床反应器上于常压反应条件下研究了NO 半焦催化还原反应 .研究发现 ,Ca和Fe对半焦还原NO的反应具有催化作用 ,其中Fe的催化作用强于Ca ;热处理温度升高 ,Ca的催化作用降低 ,但热处理温度的变化基本不影响Fe的催化活性 ;CO和O2 气氛可以促进NO的还原 ,温度升高CO和O2The effects of calcium and iron impregnated on coal chars as catalysts in NO char reaction were investigated. The NO char reaction was studied in a quartz fixed bed reactor at atmospheric pressure. Temperature programmed reaction (TPR) and isothermal reaction were used to determine the catalytic activities of calcium and iron at various atmosphere environments. The results showed that the higher the temperatures of pretreatment, the lower the catalytic activity of calcium, while the pretreatment temperatures had little effect on the catalytic activity of iron. Both calcium and iron promoted the NO char reaction, but the catalytic activity of the latter was higher than that of the former. NO reduction by CO was strongly promoted by Fe and Ca. The addition of O 2 in the char NO Ca or charNO Fe system promoted the NO reduction significantly. Oxidation/reduction mechanisms were proposed for the NO reduction by char catalyzed by Ca and Fe.

关 键 词：NO 半焦 催化反应 催化还原 氧化氮 铁 钙 煤炭燃烧 废气处理 

分 类 号：X701.7[环境科学与工程—环境工程] TQ534.9[化学工程—煤化学工程]