Abstract The high-temperature (HT) and low-temperature (LT) hydrothermal stabilities of molecular-sieve-based catalysts are important for the selective catalytic reduction of NOx with ammonia (NH3-SCR). In this paper, we report a catalyst, Cu2+ loading SAPO-17, synthesized using cyclohexylamine (CHA), which is commercially available and inexpensive and is utilized in NH3-SCR reduction for the first time. After systematic investigations on the optimization of Si and Cu2+ contents, it was concluded that Cu-SAPO-17-8.0%-0.22 displays favorable catalytic performance, even after being heated at 353 K for 24 h and at 973 K for 16 h. Moreover, the locations of CHAs, host–guest interaction and the Bronsted acid sites were explored by Rietveld refinement against powder X-ray diffraction data of as-made SAPO-17-8.0%. The refinement results showed that two CHAs exist within one eri cage and that the protonated CHA forms a hydrogen bond with O4, which indicates that the proton bonding with O4 will form the Bronsted acid site after the calcination.

中文翻译：

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Cu-SAPO-17：一种用于选择性催化还原 NO 的新型催化剂

摘要 分子筛基催化剂的高温 (HT) 和低温 (LT) 水热稳定性对于氨选择性催化还原 NOx (NH3-SCR) 具有重要意义。在本文中，我们报告了一种催化剂，Cu2+ 负载 SAPO-17，使用环己胺 (CHA) 合成，该催化剂可商购且价格低廉，并首次用于 NH3-SCR 还原。在对 Si 和 Cu2+ 含量的优化进行系统研究后，得出结论，Cu-SAPO-17-8.0%-0.22 显示出良好的催化性能，即使在 353 K 加热 24 小时和 973 K 加热 16 小时后也是如此。此外，通过 Rietveld 细化对原始 SAPO-17-8.0% 的粉末 X 射线衍射数据探索了 CHA 的位置、主客体相互作用和布朗斯台德酸位点。