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Combining Cu-SSZ-13 with TiO2: promotion of urea decomposition and influence on SCR
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2022-06-09 , DOI: 10.1039/d2re00140c Yue Ma 1 , Zhimin Shao 2 , Xiaodong Wu 1 , Yang Gao 1 , Baofang Jin 3 , Rui Ran 1 , Zhichun Si 4 , Zhenguo Li 5 , Duan Weng 1, 4
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2022-06-09 , DOI: 10.1039/d2re00140c Yue Ma 1 , Zhimin Shao 2 , Xiaodong Wu 1 , Yang Gao 1 , Baofang Jin 3 , Rui Ran 1 , Zhichun Si 4 , Zhenguo Li 5 , Duan Weng 1, 4
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Urea is applied as an ammonia source for SCR in diesel vehicles, but incomplete urea decomposition may lead to insufficiency of NH3 and deposition of solid by-products. To improve the urea decomposition activity of Cu-SSZ-13 SCR catalysts, Cu-SSZ-13 was combined with TiO2 nanoparticles by a simple impregnation method. TiO2/Cu-SSZ-13 composites exhibited lowered decomposition temperatures of urea and related solid by-products. Thus, the composited catalysts showed higher NOx conversion and a lower amount of urea-related deposits than unmodified Cu-SSZ-13 in a simulated urea deposition scenario. The superiority of the urea decomposition activity of the composited catalysts was maintained upon 800 °C hydrothermal aging due to stabilized anatase over the catalysts according to XRD and Raman spectroscopy. H2-TPR, UV-vis, and STEM revealed the formation of Cu–Ti–O species due to Cu–Ti interactions, which was adverse to SCR activity, but no extra hydrothermal aging effect was observed on the composited catalysts compared with unmodified Cu-SSZ-13. This work showed the potential to improve the low-temperature urea-SCR performance of Cu-SSZ-13 via TiO2 modification.
中文翻译：
Cu-SSZ-13 与 TiO2 的结合：促进尿素分解和对 SCR 的影响
尿素用作柴油车SCR的氨源，但尿素分解不完全可能导致NH 3不足和固体副产物沉积。为提高Cu-SSZ-13 SCR催化剂的尿素分解活性，采用简单的浸渍法将Cu-SSZ-13与TiO 2纳米粒子结合。TiO 2 /Cu-SSZ-13 复合材料的尿素和相关固体副产物的分解温度降低。因此，复合催化剂显示出更高的 NO x在模拟的尿素沉积场景中，转化率和尿素相关沉积量低于未改性的 Cu-SSZ-13。根据 XRD 和拉曼光谱，由于稳定的锐钛矿，复合催化剂的尿素分解活性在 800 ℃水热老化时保持了优越性。H 2 -TPR、UV-vis 和 STEM 揭示了由于 Cu-Ti 相互作用形成 Cu-Ti-O 物质，这对 SCR 活性不利，但与未改性的复合催化剂相比，未观察到对复合催化剂的额外水热老化效应铜-SSZ-13。这项工作显示了通过TiO 2改性提高 Cu-SSZ-13 的低温尿素-SCR 性能的潜力。
更新日期：2022-06-09
中文翻译：
Cu-SSZ-13 与 TiO2 的结合：促进尿素分解和对 SCR 的影响
尿素用作柴油车SCR的氨源，但尿素分解不完全可能导致NH 3不足和固体副产物沉积。为提高Cu-SSZ-13 SCR催化剂的尿素分解活性，采用简单的浸渍法将Cu-SSZ-13与TiO 2纳米粒子结合。TiO 2 /Cu-SSZ-13 复合材料的尿素和相关固体副产物的分解温度降低。因此，复合催化剂显示出更高的 NO x在模拟的尿素沉积场景中，转化率和尿素相关沉积量低于未改性的 Cu-SSZ-13。根据 XRD 和拉曼光谱，由于稳定的锐钛矿，复合催化剂的尿素分解活性在 800 ℃水热老化时保持了优越性。H 2 -TPR、UV-vis 和 STEM 揭示了由于 Cu-Ti 相互作用形成 Cu-Ti-O 物质，这对 SCR 活性不利，但与未改性的复合催化剂相比，未观察到对复合催化剂的额外水热老化效应铜-SSZ-13。这项工作显示了通过TiO 2改性提高 Cu-SSZ-13 的低温尿素-SCR 性能的潜力。
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