At present, the deactivation of selective catalytic reduction (SCR) catalysts caused by the coexistence of alkali metal and phosphorus (P) remains an urgent problem and lacks corresponding strategies against catalyst poisoning. Herein, a novel zeolite-like Ce–Si₅Al₂O_x catalyst derived from an ultrasmall nanozeolite EMT precursor was synthesized without organic templates at ambient temperature. This catalyst was able to maintain above 95% NO_x conversion in the 270–540 °C temperature range. Moreover, 1 wt % potassium (K) and 5 wt % P loading had no influence on the SCR performance of the Ce–Si₅Al₂O_x catalyst at 300–480 °C. It was demonstrated that cerium (Ce) was highly dispersed in the amorphous aluminum (Al) silicate derived from EMT zeolites and expressed high catalytic performance. Besides, a large number of acid sites were reserved to absorb ammonia allowing effective participation in the SCR reaction and capturing alkali metals, thus improving the SCR performance and K resistance. Additionally, the strong interaction between Ce and aluminosilicate decreased cerium phosphate production, preventing deactivation of the catalysts. Thus, this novel low-cost zeolite-like Ce–Si₅Al₂O_x catalyst with a highly active ion-exchanged metal phase and abundant surface acid sites paves a way for designing new efficient and poisoning-resistant SCR catalysts for practical applications.

中文翻译：

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耐碱和抗磷的沸石样催化剂，用于还原NH3。

当前，由碱金属和磷（P）的共存引起的选择性催化还原（SCR）催化剂的失活仍然是一个紧迫的问题，并且缺乏应对催化剂中毒的策略。本文中，在室温下无需有机模板的情况下，合成了一种由超小纳米沸石EMT前驱体衍生的新型沸石状Ce-Si ₅ Al ₂ O _x催化剂。该催化剂能够维持超过95％的NO _X在270-540℃的温度范围内转换。此外，1 wt％的钾（K）和5 wt％的P含量对Ce–Si ₅ Al ₂ O _x的SCR性能没有影响。催化剂在300–480°C下。结果表明，铈（Ce）高度分散在源自EMT沸石的无定形硅酸铝（Al）中，并具有较高的催化性能。此外，保留了大量的酸位以吸收氨，从而有效地参与SCR反应并捕获碱金属，从而提高了SCR性能和耐K性能。另外，铈与铝硅酸盐之间的强相互作用降低了磷酸铈的产生，从而防止了催化剂的失活。因此，这种新颖的低成本沸石状Ce–Si ₅ Al ₂ O _x 具有高活性离子交换金属相和丰富的表面酸位的催化剂为设计用于实际应用的新型高效且抗中毒的SCR催化剂铺平了道路。