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首页> 外文期刊>Catalysis science & technology >Effect of the hydrothermal aging temperature and Cu/Al ratio on the hydrothermal stability of CuSSZ-13 catalysts for NH3-SCR
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Effect of the hydrothermal aging temperature and Cu/Al ratio on the hydrothermal stability of CuSSZ-13 catalysts for NH3-SCR

机译：水热温度和老化的效果铜/铝比的水热稳定性CuSSZ-13 NH3-SCR的催化剂

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摘要

The effects of the hydrothermal aging temperature on the catalytic performance and stability of CuSSZ-13 catalysts with various Cu/Al ratios were studied. The conversions of NO and NH3 were tested in the standard NH3-SCR reactions. The NH3-SCR activity of the catalysts decreased with the increasing hydrothermal aging temperature. Remarkably, the reduction was more significant as the Cu/Al ratio increased. The physicochemical properties of the samples were characterized by means of a number of analytical techniques. The results show that the hydrothermal stability of the CuSSZ-13 catalyst decreased with the increase in the hydrothermal aging temperature and Cu/Al ratio in the catalyst. Such a decrease was attributed to a drop in the number of isolated Cu2+ (in D6R and CHA cage). The transformation of the Cu2+ ions into new species (Cu2+ on Al2O3) depended on the collapse of the SSZ-13 structure after the hydrothermal aging treatment and was more likely to appear in the high Cu/Al-ratio samples and at a higher aging temperatures. The phase transformation of Cu2+ to agglomerated CuxO also occurred during the hydrothermal aging process. The formation of a large number of CuxO species might destroy the SSZ-13 structure, leading to deactivation of the catalyst.
机译：水热老化温度的影响的催化性能和稳定性CuSSZ-13催化剂与各种铜/铝比率研究。测试标准NH3-SCR反应。NH3-SCR催化剂的活性下降增加水热老化温度。值得注意的是,更重要的是减少铝/铜比例增加。样本的特征的属性的分析技术。结果表明,热液的稳定性CuSSZ-13催化剂减少增加在水热老化温度和铜/铝比例的催化剂。归因于孤立的数量下降Cu2 + (CHA D6R和笼子里)。Cu2 +离子进入新物种(Cu2 +氧化铝)取决于SSZ-13结构的崩溃水热老化后治疗和更有可能出现在高铜/ Al-ratio样品和老化温度更高。相变对凝聚CuxO Cu2 +也发生在水热老化的过程。物种可能摧毁SSZ-13结构,导致催化剂失活。

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