SO_2气氛下半焦负载Na,Ca,Fe对NO-半焦还原反应的影响

Influence of Char Loaded with Na,Ca and Fe on Reaction of NO-Char in the Presence of SO_2

通过程序升温实验和暂态响应实验 ,研究了 SO2 气氛下半焦负载 Na,Ca,Fe对 NO-半焦还原反应的影响 ;结果表明 SO2 对 NO-半焦反应的影响因温度高低而不同 ,低温下由于 SO2 在半焦表面的化学吸附占据了半焦表面的活性位 ,因而抑制 NO的还原 ,高温则有利于 SO2 - NO气相反应 ,从而致使 NO转化率升高 ;SO2 对 NO-负载催化剂半焦还原反应有抑制作用 ,其抑制程度与温度有关 ,低温下随温度升高 ,抑制程度增加 ,高温下随温度升高抑制程度降低 ;负载 Na,Ca和 Fe的半焦在 SO2 气氛下对 NO-半焦还原反应表现为不同的活性 ,其中 Fe的活性最高 ,Na的活性受 SO2 影响最大 ,这与硫酸盐的分解温度以及 SO2 在半焦表面化学吸附性质有关 .

Influence of char loaded with Na,Ca and Fe on the reaction of NO char in the presence of SO 2 was investigated by temperature programmed reaction(TPR) and the transient reaction methods. The results show that the effect of SO 2 on the reaction of NO char changes with the temperature. At low temperatures SO 2 can be chemisorbed on the char surface, inhibitting the reduction of NO, while at high temperatures the NO conversion is improved by the reaction of SO 2 NO. The reaction between NO and catalyst loaded char is inhibitted in the presence of SO 2, which is related to temperature.The activities of Na ,Ca and Fe on the NO char reaction are different in the presence of SO 2. The Fe has the highest activity among the three catalysts, while SO 2 shows the maximum inhibition on Na activity.