This research focused on the hydrothermal tolerance of Cu/SAPO-34 and Cu/SSZ-13 catalysts. Either low- or high-temperature aging decreases the catalytic property of Cu/SAPO-34. Cu/SAPO-34 lost some isolated copper sites, and new copper-aluminum complexes CuAl₂O₄ and Al-rich CuO_x clusters formed after low temperature aging. High temperature aging resulted in CuO_x clusters and AlPO₄ species formed, which led to the loss of Cu²⁺ active sites and surface nitrates adsorbed sites over Cu/SAPO-34. Cu/SSZ-13 retained the catalytic performance after low temperature aging but was totally intolerant to high temperature aging. High temperature hydrothermal aging led to the loss of active sites, lack of surface nitrates adsorbed sites, and serious structural degradation over Cu/SSZ-13.

本研究的重点是 Cu/SAPO-34 和 Cu/SSZ-13 催化剂的耐水热性。低温或高温老化都会降低 Cu/SAPO-34 的催化性能。Cu/SAPO-34失去了一些孤立的铜位点，低温时效后形成了新的铜铝配合物CuAl ₂ O ₄和富铝CuO _x簇。高温老化导致形成CuO _x簇和AlPO ₄物种，导致Cu ²⁺损失Cu/SAPO-34 上的活性位点和表面硝酸盐吸附位点。Cu/SSZ-13在低温老化后保留了催化性能，但完全不耐受高温老化。高温水热老化导致活性位点丢失，表面硝酸盐吸附位点缺失，Cu/SSZ-13 结构严重退化。