Low temperature performance is key for catalysts used in selective catalytic reduction of NO_x with ammonia (NH₃-SCR). The best performing NH₃-SCR catalysts are based on small pore copper loaded zeolites. A key question remains which structural and compositional parameters make a copper zeolite catalytically active in this application. In this work a collection of 83 different zeolite samples having 25 different frameworks and compositional variations was evaluated to uncover the critical structural and compositional parameters governing catalytic activity at 150 °C. The Si/Al ratio, the content of double six-ring building units, the framework density and pore dimensionality were identified as having a strong impact on the catalytic activity of zeolites. A critical value for each of these parameters was determined. This knowledge was used to predict MOZ, SZR and GME as active NH₃-SCR catalysts. They were synthesized respecting the compositional prerequisites and their catalytic evaluation confirmed the predicted high catalytic activity.

低温性能是用于选择性催化还原NO的使用的催化剂键_X与氨（NH ₃ -SCR）。表现最好的NH ₃-SCR催化剂基于小孔负载铜的沸石。关键问题仍然在于，哪些结构和组成参数使铜沸石在该应用中具有催化活性。在这项工作中，对具有25种不同骨架和组成变化的83种不同沸石样品的集合进行了评估，以揭示控制150°C催化活性的关键结构和组成参数。硅/铝比，双六环结构单元的含量，骨架密度和孔尺寸被确定为对沸石的催化活性具有强烈影响。确定了每个参数的临界值。该知识可用于预测MOZ，SZR和GME作为活性NH ₃-SCR催化剂。合成它们时要考虑到组成的先决条件，并且其催化评价证实了预期的高催化活性。