Investigation of Suitable Templates for One-Pot-Synthesized Cu-SAPO-34 in NOx Abatement from Diesel Vehicle Exhaust.,Environmental Science & Technology

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Investigation of Suitable Templates for One-Pot-Synthesized Cu-SAPO-34 in NOx Abatement from Diesel Vehicle Exhaust.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-06-16 , DOI: 10.1021/acs.est.0c01743
Jinpeng Du _{1,

2} , Xiaoyan Shi _{1,

2} , Yulong Shan ₁ , Wenshuo Zhang _{1,

2} , Yunbo Yu _{1,

2,

3} , Wenpo Shan _{3,

4} , Hong He _{1,

2,

3}

Affiliation

The control of NO_x emission from diesel vehicles is of great importance to the environment, and Cu-SAPO-34 is considered to be an effective catalyst for the abatement of NO_x from diesel vehicles. Along with catalytic activity, hydrothermal stability is a key property for NO_x abatement catalysts. The attack of Cu species and framework atoms by H₂O may result in activity loss under both low/high temperature humid conditions, which are inevitable in practical application. Therefore, apart from good catalytic activity, hydrothermal stability under both low/high temperatures for Cu-SAPO-34 is also critical for NO_x control in diesel vehicles. Three Cu-SAPO-34 samples were prepared by a one-pot hydrothermal method using propylamine, triethylamine, and morpholine, with Cu-TEPA (tetraethylenepentamine) as the cotemplate. The NH₃-SCR activity and the effects of hydrothermal aging at 70 and 800 °C on these Cu-SAPO-34 samples were investigated. The type of cotemplate can affect the Si and Cu species in one-pot-synthesized Cu-SAPO-34 catalysts, so that the catalytic activity as well as the low/high temperature hydrothermal stability is affected by the choice of template. Generally speaking, Cu-SAPO-34 prepared using PA as cotemplate showed superior catalytic activity and hydrothermal stability under low/high temperatures compared with the other two catalysts, which makes PA a more suitable template for one-pot-synthesized Cu-SAPO-34 for use in NO_x abatement from diesel vehicle exhaust.

中文翻译：

一锅合成Cu-SAPO-34减少柴油车尾气中NOx的合适模板的研究。

NO的控制_X从柴油车辆排放是非常重要的环境，和Cu-SAPO-34被认为是对NO的减排的有效催化剂_X从柴油车辆。除催化活性外，水热稳定性也是减少NO _x催化剂的关键性能。H ₂ O对Cu物种和骨架原子的攻击可能导致在低温/高温潮湿条件下的活性损失，这在实际应用中是不可避免的。因此，除了良好的催化活性外，Cu-SAPO-34在低温/高温下的水热稳定性对于NO _x也是至关重要的柴油车辆的控制。通过一锅水热法，使用丙胺，三乙胺和吗啉，以Cu-TEPA（四亚乙基五胺）为模板，制备了三个Cu-SAPO-34样品。NH ₃研究了Cu-SAPO-34样品的-SCR活性以及在70和800°C的水热老化的影响。共模板的类型会影响一锅合成Cu-SAPO-34催化剂中的Si和Cu种类，因此模板的选择会影响催化活性以及低温/高温水热稳定性。一般而言，与其他两种催化剂相比，以PA为共模板制备的Cu-SAPO-34在低温/高温下表现出优异的催化活性和水热稳定性，这使得PA成为更适合一锅合成Cu-SAPO-34的模板用于减少柴油车尾气中的NO _x。

更新日期：2020-07-07

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