通过 CeZrOx/Cu-SSZ-39 混合催化剂增强一氧化氮还原:提高活性和水热稳定性

IF 1.4 4区 工程技术 Q3 ENGINEERING, CHEMICAL Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-05-31 DOI:10.1002/apj.3109
Yunhui Li, Kunting Li, Xingdong Zhu, Xinyan Zhang, Xin Zhang
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引用次数: 0

摘要

本研究旨在通过将 Cu-SSZ-39 沸石与具有优异氧化能力的锆铈氧化物(CeZrOx)偶联,提高其催化活性和水热稳定性,并制备了 CeZrOx/Cu-SSZ-39 混合催化剂。研究发现,与 Cu-SSZ-39 相比,该催化剂的低温活性、高温活性和有效温度范围都有所提高。表征结果表明,CeZrOx/Cu-SSZ-39 催化剂具有更高浓度的活性 Cu2+ 离子物种和更好的氧化还原特性,这有可能促进 NH3-SCR 反应。此外,CeZrOx/Cu-SSZ-39 催化剂表面的化学吸附氧物种增加,促进了 NO 氧化为 NO2,提高了 SCR 反应的速率。此外,即使经过水热老化处理,CeZrOx/Cu-SSZ-39 催化剂仍表现出优异的催化活性和更高的水热稳定性,其性能超过了 Cu-SSZ-39。研究发现,CeZrOx 的偶联使混合催化剂在水热老化过程中保持了更好的比表面积和孔隙结构,从而减少了活性损失。因此,CeZrOx 的添加增强了 Cu-SSZ-39 沸石的 NH3-SCR 活性,从而提高了催化活性和水热稳定性。CeZrOx/Cu-SSZ-39 催化剂在减少柴油车尾气中的氮氧化物排放方面显示出良好的前景。
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Enhancement of nitric oxide reduction via CeZrOx/Cu-SSZ-39 hybrid catalyst: Improving activity and hydrothermal stability

This study aimed to improve the catalytic activity and hydrothermal stability of Cu-SSZ-39 zeolite by coupling it with cerium zirconium oxides (CeZrOx), which possesses excellent oxidizing ability, and a hybrid catalyst CeZrOx/Cu-SSZ-39 was prepared. It is found that it exhibited enhanced low-temperature activity, high-temperature activity, and a wider effective temperature range compared to Cu-SSZ-39. Characterization results showed that the CeZrOx/Cu-SSZ-39 catalyst had a higher concentration of active Cu2+ ion species and improved redox properties, which could potentially promote the NH3-SCR reaction. Additionally, the CeZrOx/Cu-SSZ-39 catalyst had increased chemisorbed oxygen species on its surface, facilitating the oxidation of NO to NO2 and enhancing the rate of the SCR reaction. Moreover, even after undergoing hydrothermal aging treatment, the CeZrOx/Cu-SSZ-39 catalyst exhibited superior catalytic activity and improved hydrothermal stability, surpassing the performance of Cu-SSZ-39. It is found the CeZrOx coupling allowed the hybrid catalyst to maintain a better specific surface area and pore structure during hydrothermal aging, resulting in reduced activity loss. Therefore, the addition of CeZrOx enhanced the NH3-SCR activity of Cu-SSZ-39 zeolite, leading to improved catalytic activity and hydrothermal stability. CeZrOx/Cu-SSZ-39 catalyst has shown promising aspect for reducing NOx emissions from diesel vehicle exhaust.

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来源期刊
自引率
11.10%
发文量
111
期刊介绍: Asia-Pacific Journal of Chemical Engineering is aimed at capturing current developments and initiatives in chemical engineering related and specialised areas. Publishing six issues each year, the journal showcases innovative technological developments, providing an opportunity for technology transfer and collaboration. Asia-Pacific Journal of Chemical Engineering will focus particular attention on the key areas of: Process Application (separation, polymer, catalysis, nanotechnology, electrochemistry, nuclear technology); Energy and Environmental Technology (materials for energy storage and conversion, coal gasification, gas liquefaction, air pollution control, water treatment, waste utilization and management, nuclear waste remediation); and Biochemical Engineering (including targeted drug delivery applications).
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