王 犇¹,潘 齐²,刘剑勋¹,栾欣汝¹,翟羽佳¹,艾利杰¹,刘 伟¹,王仲鹏¹

(1. 济南大学水利与环境学院,山东济南250022;2. 山东省生态环境监测中心,山东济南250101)

引用格式：王犇,潘齐,刘剑勋.溶液燃烧制备镧基钙钛矿及其催化碳烟燃烧性能[J].中国粉体技术,2023,29(3)：92-100.

WANG B,PAN Q,LIU J X,et al.Lanthanum-based perovskite catalysts prepared by solution combustion method and its catalytic performance for soot combustion[J].China Powder Science and Technology,2023,29(3)：92-100.

DOI：10.13732/j.issn.1008-5548.2023.03.009

收稿日期： 2023-01-10,修回日期：2023-01-28，在线出版时间：2023-04-21 16:27。

基金项目：国家自然科学基金项目,编号 ：21777055;山东省自然科学基金项目,编号：ZR2021MB063,ZR2020MB120,ZR2022MB011。

第一作者简介：王犇(1997—),女,硕士研究生,研究方向为环境功能材料开发与应用。E-mail：benwang97@163.com。

通信作者简介：王仲鹏(1978—),男,教授,博士,博士生导师,研究方向为大气污染控制与催化技术。E-mail：chm_wangzp@ujn.edu.cn。

(责任编辑：吴敬涛)

摘要： 采用溶液燃烧法制备不同B位过渡金属元素(Mn、Fe、Co、Ni)的La基钙钛矿(LaMO₃)催化剂,并考察少量Sr部分取代La对催化剂性能的影响;通过XRD、SEM、BET、H₂-TPR、XPS方法对催化剂进行理化性质表征,采用程序升温氧化(TPO)技术评估催化剂催化碳烟燃烧的性能。结果表明：溶液燃烧法制备的La基催化剂具有典型的钙钛矿结构,少量Sr 掺杂不改变催化剂的晶型;Sr掺杂LaMnO₃引起的电荷不平衡由增加的Mn⁴⁺补偿,Sr掺杂LaCoO₃使吸附氧量明显提高;La_0.9Sr_0.1MnO₃和La_0.9Sr_0.1NiO₃的氧化还原性能相比掺杂Sr之前的有所下降,La_0.9Sr_0.1FeO₃表面吸附氧物种量增多,催化剂的低温氧化还原性提升;气氛中NO_x的存在可进一步降低催化碳烟燃烧温度,La_0.9Sr_0.1CoO₃催化剂具有最好的催化活性,催化碳烟燃烧的t₅₀(质量分数为50%的碳烟转化温度)为369 ℃,生成CO₂选择性S_CO2为100%。

关键词：溶液燃烧法;镧基钙钛矿;碳烟;催化燃烧

Abstract：La-based perovskite (LaMO₃) catalysts with different B-sites transition mental elements(Mn、Fe、Co、Ni) were prepared by solution combustion method,and the effect of partial substitution of La by a small amount of Sr on the catalyst performance was investigated.The catalysts were characterized physicochemically by XRD,SEM,BET,H₂-TPR and XPS,and the performance of the catalysts for catalytic carbon soot combustion was evaluated by temperature-programmed oxidation (TPO).The results show that the La-based catalysts prepared by solution combustion method have a typical perovskite structure,and the crystal morphology of the catalysts is not changed after Sr doping.The charge imbalance caused by Sr doping LM is compensated by the increase of Mn⁴⁺.Sr doping LC significantly increases the amount of adsorbed oxygen.The redox performance of LSM and LSN are lower than that of Sr-free samples and the amount of oxygen species adsorbed on LSF surface increases,which improve the low temperature oxidation reducibility of the catalyst.The LSC catalyst has the best catalytic performance among these catalysts,with the t₅₀ of catalytic soot combustion=369 ℃ and S_CO2=100%.

Keywords：solution combustion method;La-based perovskite;soot;catalytic combustion

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