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首页> 外文期刊>Catalysis science & technology >Comprehensive effect of tuning Cu/SAPO-34 crystals using PEG on the enhanced hydrothermal stability for NH3-SCR
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Comprehensive effect of tuning Cu/SAPO-34 crystals using PEG on the enhanced hydrothermal stability for NH3-SCR

机译：全面优化铜/ SAPO-34晶体的影响使用增强的热液稳定挂钩对于NH3-SCR

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摘要

The high-efficiency NH3-assisted selective catalytic reduction (NH3-SCR) technology continues to attract wide attention in diminishing harmful nitrogen oxides (NOx) from diesel exhausts. However, one of the crucial challenges is the deteriorated performance of NH3-SCR catalysts during the regeneration of the diesel particulate filter (high-temperature hydrothermal conditions). To address it and meet the need for environmental protection, we tried to adopt poly(ethylene glycol) (PEG) to fabricate intact hierarchical zeolite crystals and finally enhance the hydrothermal stability. The characterization evidences that the stable Si-O-Al structure exists in this optimal structure after the hydrothermal treatment at 800 degrees C, which provides some favorable intermediates on the Cu-zeolite in the low-temperature (150-350 degrees C) region, particularly the activation of NO into bridged nitrates on adjacent isolated copper sites. Besides, Cu/SAPO-34 catalysts modified with PEG still better convert NOx into N-2 after the hydrothermal aging at 70 degrees C for 10 hours. Our study thus provides a new idea for improving the hydrothermal stability of the Cu/zeolite NH3-SCR catalyst to remove NOx. This robust hydrothermal stability of Cu/zeolite helps its better sustainable application under harsh NOx removal conditions.
机译：高效NH3-assisted选择性催化还原(NH3-SCR)技术继续吸引广泛关注减少有害的氮氧化物(NOx)柴油尾气。挑战是恶化的表现NH3-SCR催化剂的再生柴油微粒过滤器(高温水热条件)。对环境保护的需要,我们尝试采用聚(乙二醇)(挂钩)来制造完整的层次结构沸石晶体最后提高水热稳定性。特性稳定的证据在这个最优Si-O-Al结构存在结构热液治疗后800年度,它提供了一些有利的Cu-zeolite的中间体低温(150 - 350摄氏度)的区域,特别是激活的成桥接硝酸盐在相邻孤立铜网站。此外,铜/ SAPO-34催化剂改性与挂钩仍然好后将氮氧化物转化为n - 2在70摄氏度水热老化了10个小时。我们的研究为改进提供了一个新的想法铜/沸石的水热稳定性NH3-SCR去除氮氧化物催化剂。铜/沸石帮助其水热稳定性被严厉的氮氧化物应用更好的可持续发展删除的条件。

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