Abstract The ceria-based catalyst exhibited excellent storage/release characteristics of ammonia, ensuring stable deNOx efficiency under fluctuating engineering conditions, while greatly reducing ammonia slip. In this work, characteristics of ammonia storage/release of CeSnWBaOx/TiO2 catalyst were investigated. Results showed that the catalyst exhibited much higher catalytic activity than the theoretical maximum under low NH3/NO ratios. Especially, the amount of effective ammonia release reached maximum at 250 °C with increase of excess NO. Low temperature was conducive to storage and the stable storage amount was 22.97 μmol·m−2 at 50 °C, effective release of ammonia occurred mainly at the active temperature window. Ammonia storage of the CeSnWBaOx/TiO2 catalyst was affected by the activation of active sites and thermal vibration at the same time. Ammonia storage under low temperature was mainly in physical form and at weak acid sites, while high temperature enhanced activation of ammonia, resulting in an increase of ammonia storage at 350 °C. The catalyst had both weak and strong stored-ammonia, strong stored-ammonia could be effectively released only in the induction of NO. Ammonia storage of catalyst was the key to ensure stable deNOx efficiency under fluctuating engineering condition. The characteristics are of great guiding significance for dealing with ammonia slip.

中文翻译：

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CeSnWBaOx/TiO2催化剂的氨储放特性解决氨逃逸问题

摘要 该氧化铈基催化剂表现出优异的氨储存/释放特性，确保在波动的工程条件下稳定脱硝效率，同时大大减少氨逃逸。在这项工作中，研究了 CeSnWBaOx/TiO2 催化剂的氨储存/释放特性。结果表明，在低 NH3/NO 比率下，催化剂表现出比理论最大值高得多的催化活性。特别是，随着过量 NO 的增加，有效氨释放量在 250 °C 时达到最大值。低温有利于储存，50℃下稳定储存量为22.97 μmol·m-2，氨的有效释放主要发生在活性温度窗口。CeSnWBaOx/TiO2 催化剂的氨储存同时受到活性位点活化和热振动的影响。低温下氨的储存主要以物理形式和弱酸性位点，而高温增强了氨的活化，导致350℃下氨的储存增加。该催化剂同时具有弱储氨和强储氨，强储氨只有在NO的诱导下才能有效释放。催化剂的氨储存是在波动的工程条件下确保稳定脱硝效率的关键。这些特性对处理氨逃逸具有重要的指导意义。只有在NO的诱导下才能有效释放强储氨。催化剂的氨储存是在波动的工程条件下确保稳定脱硝效率的关键。这些特性对处理氨逃逸具有重要的指导意义。只有在NO的诱导下才能有效释放强储氨。催化剂的氨储存是在波动的工程条件下确保稳定脱硝效率的关键。这些特性对处理氨逃逸具有重要的指导意义。