Catalytic Reduction of NO by Chars Loaded with Ca and Fe
半焦负载钙和铁催化还原NO的研究

The 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 O2 in the char-NO-Ca or char-NO-Fe system promoted the NO reduction significantly. Oxidation/reduction mechanisms were proposed for the NO reduction by char catalyzed by Ca and Fe.