The preparation method effect on the catalytic properties and hydrothermal stability of copper-loaded LTA (Cu-LTA) zeolites for the selective catalytic reduction of NO_x with NH₃ (NH₃-SCR) has been investigated. Copper nitrate and liquid-state ion exchange (IE) was found to be the best for maximizing the SCR performance of Cu-LTA among the Cu sources and loading methods studied here. When fresh, the low-temperature (≤ 400 °C) activity of Cu-LTA prepared in this way, denoted Cu-LTA(n)IE, is lower than that of the catalyst prepared using copper acetate via ion exchange. After hydrothermal aging at 900 °C for 24 h, however, Cu-LTA(n)IE shows a higher deNO_x activity in the studied temperature range than any other catalysts. The overall characterization results show that the excellent hydrothermal durability of Cu-LTA(n)IE resulted from the stability of [2Z-Cu] species generated by locating Cu²⁺ ions onto Al pairs in the LTA framework.

研究了制备方法对负载铜 LTA (Cu-LTA) 沸石的催化性能和水热稳定性的影响，用于用 NH ₃ (NH ₃ -SCR)选择性催化还原 NO _x。硝酸铜和液态离子交换 (IE) 被发现是在此处研究的 Cu 源和负载方法中最大化 Cu-LTA SCR 性能的最佳方法。新鲜时，以这种方式制备的 Cu-LTA 的低温（≤ 400 °C）活性，表示为 Cu-LTA( n )IE，低于使用醋酸铜通过离子交换制备的催化剂。热液，在900℃下老化24小时，但是，铜- LTA（后Ñ）IE显示出更高DENO _X在研究温度范围内的活性高于任何其他催化剂。整体表征结果表明，Cu-LTA( n )IE优异的水热耐久性源于通过将 Cu ²⁺离子定位在 LTA 框架中的 Al 对上而产生的 [2Z-Cu] 物种的稳定性。