SO2存在下钠、钙、铁及其复合物对NO-半焦反应的催化作用

采用程序升温还原技术，在SO2存在气氛下，对钠、钙、铁及其复合物的NO-半焦催化反应性能进行了研究。结果表明，在相同条件下三种金属对NO-半焦反应的催化活性顺序为：Fe>Ca>Na。SO2可能通过参与氧传递过程来影响金属对NO-半焦反应的催化活性。SO2的浓度对负载三种不同金属半焦催化活性的影响是不同的。SO2浓度对负载钠半焦的催化活性影响最为显著。在SO2存在气氛下，负载2％钠或铁和负载3％钙的半焦具有高的NO转化活性。在SO2存在气氛下，钠－钙和钠－铁二元金属复合催化剂的活性较高，这可能是由于这两种金属间存在协同作用的缘故。

Catalytic effects of Na, Ca, Fe and their composites on NO-char reaction in the presence of SO2

Catalytic effects of Na,Ca,Fe and their composites on NO-char reaction in the presence of SO2 were investigated by Temperature Programmed Reaction(TPR) technique.The catalytic activity order of three metals is Fe>Ca>Na in the same conditions.SO2 may participate in the oxygen-transfer process to influence the metal catalytic effect in NO-char reaction.For three types of metal loaded catalysts,effects of SO2 concentration on their catalytic activities are different.The catalytic activity of Na loaded char is influenced most by the SO2 concentration.2% Na or Fe loaded chars and 3% Ca loaded char have the highest NO conversion activity in the presence of SO2.NaFe and Na-Ca composite catalysts have higher catalytic activity.Synergistic effect of Na-Ca and Na-Fe may be responsible for the high NO conversion activity of these bimetallic catalysts in the presence of SO2.