Improving SO/HO resistance at low temperatures is a key challenge for industrial applications of NH-SCR catalysts. Herein, a novel catalyst with remarkable low-temperature NH-SCR activity and strong SO/HO resistance was designed by loading MoO protective layer over porous kit-CeO. The in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) coupled with basic characterization techniques were utilized to further elucidate the underlying mechanisms, and a dynamic balance between the deposition and decomposition of ammonia bisulfate was captured over porous kit-CeO. Highly dispersed MoO species pre-adsorbed with NH significantly curtailed the adsorption of NO molecules, and the catalytic reaction over MoO/kit-CeO primarily followed by the Eley-Rideal mechanism. At 250 °C, in the presence of SO and HO, the Ce-O-Mo pairing site was almost unaffected and the super SO- and HO-tolerant property originated from the facilitated decomposition of ammonium bisulfate (ABS) and the shielding effect of Mo protective layer on SO/HO. This study provided an important guidance to the application of ceria-based catalysts for environmental control within low-temperature operations in non-power industries such as glass, steel, cement manufacturing, etc.

中文翻译：

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通过保护二氧化铈基催化剂免受中毒，在低温下耐受 SO2 和 H2O 催化还原 NOx：一种有效的保护机制

提高低温下的 SO/H2O 耐受性是 NH-SCR 催化剂工业应用的关键挑战。在此，通过在多孔kit-CeO上负载MoO保护层，设计了一种具有显着低温NH-SCR活性和强SO/H2O抗性的新型催化剂。利用原位漫反射红外傅里叶变换光谱（DRIFTS）与基本表征技术相结合，进一步阐明了潜在的机制，并在多孔套件-CeO上捕获了硫酸氢氨沉积和分解之间的动态平衡。高度分散的 MoO 物种预吸附 NH 显着减少了 NO 分子的吸附，并且 MoO/kit-CeO 上的催化反应主要遵循 Eley-Rideal 机制。在 250 °C 时，在 SO 和 H2O 存在下，Ce-O-Mo 配对位点几乎不受影响，超强的 SO2 和 H2O 耐受性源于硫酸氢铵 (ABS) 的促进分解和SO/H2O 上的 Mo 保护层。该研究为二氧化铈基催化剂在玻璃、钢铁、水泥制造等非电力行业低温作业环境控制中的应用提供了重要指导。