硫中毒对Cu-SSZ-13催化剂氨气选择性催化还原NOx的影响OA
Effect of sulfur poisoning on Cu-SSZ-13 for selective catalytic reduction of NOx by ammonia
为了探究SO2对Cu-SSZ-13催化剂活性的影响,对催化剂进行不同体积分数SO2气氛下的硫化处理,并通过X射线衍射(XRD)、X射线光电子谱(XPS)、NH3程序升温脱附(NH3-TPD)和H2程序升温还原(H2-TPR)等表征手段分析了催化剂在SO2硫化前后的结构、表面元素含量、酸性含量等理化性质的变化.结果表明:经过SO2硫化后,Cu-SSZ-13催化剂低温段活性明显下降,经体积分数为200×10-6 SO2硫化后的催化剂样品在250℃下的活性下降了近70％;SO2硫化后,Cu-SSZ-13中的铜离子与SO2反应生成硫酸铜,使催化剂中Cu2+活性位点下降,L酸性位减少,而催化剂样品中产生的硫酸铜含量随着SO2硫化程度的增加而增大.
To investigate the effect of SO2 on the activity of Cu-SSZ-13 catalyst,the catalyst was subjected to sulfurization treatment with different SO2 concentrations.The structure,surface element content,acid content and other physicochemical properties of the catalyst before and after SO2 sulfurization were analyzed by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),temperature programmed desorption by ammonia(NH3-TPD)and temperature programmed reduction by hydrogen(H2-TPR).The results show that the low-temperature activity of Cu-SSZ-13 catalyst is significantly decreased after SO2 sulfurization,and the activity of the catalyst sample poisoned by 200×10-6 sulfur dioxide at 250 ℃ is decreased by nearly 70％.After SO2 sulfurization,the copper ion in Cu-SSZ-13 reacts with sulfur dioxide to form copper sulfate,which decreases the Cu2+active site and Lewis acid site in the catalyst,while the content of copper sulfate in the catalyst sample is increased with the increase of sulfur dioxide concentration.
孙平;杜健瑜;刘军恒;嵇乾;王永旭;张华斌
江苏大学汽车与交通工程学院,江苏镇江 212013江苏大学汽车与交通工程学院,江苏镇江 212013||重庆赛力斯凤凰智创科技有限公司,重庆 400041江苏大学汽车与交通工程学院,江苏镇江 212013江苏大学汽车与交通工程学院,江苏镇江 212013江苏大学汽车与交通工程学院,江苏镇江 212013江苏大学汽车与交通工程学院,江苏镇江 212013
能源科技
柴油机催化剂Cu-SSZ-13选择性催化还原硫中毒
diesel enginecatalystCu-SSZ-13selective catalytic reductionsulfur poisoning
《江苏大学学报（自然科学版）》 2026 (2)
166-174,9
国家自然科学基金资助项目(51806086)
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