La1-xKxMnO3催化剂同时消除柴油机尾气中NO和碳烟性能

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摘要采用溶剂热法制备La₁_-xK_xMnO₃(x=0, 0.10, 0.15, 0.20, 0.25)钙钛矿型复合金属氧化物催化剂;通过XRD、FT-IR、SEM、H₂-TPR、XPS、NO-TPD等手段对催化剂的物相组成、表面形貌、氧化还原性能等进行了表征;在常压固定床微型反应装置中评价催化剂同时消除NO和碳烟催化性能.结果表明,制备的La₁_-xK_xMnO₃催化剂均具有钙钛矿结构;K部分取代La-Mn钙钛矿结构中La后,颗粒结构得以改善,部分Mn³⁺价态升高为Mn⁴⁺,形成较多氧空位和Mn⁴⁺,提高氧化还原性能和吸附NO性能.活性评价结果表明,La_0.80K_0.20MnO₃催化剂表现出较好的同时消除NO和碳烟催化性能,NO最大转化率(Xmax NO)和对应反应温度(Tmax NO)分别为46.5%和436℃,碳烟起燃温度(T_ig)、CO₂浓度峰值温度(Tmax CO₂)和生成CO₂选择性(Smax CO₂)分别为341℃、454℃和98.8%.

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	赵玉
	魏波
	张鹏
	田雨
	迟姚玲
	王虹
	李翠清
	宋永吉

关键词 ：锰基钙钛矿, 钾, 一氧化氮, 碳烟

Abstract：La₁_-xk_xMnO₃ (x=0, 0.10, 0.15, 0.20, 0.25) perovskite oxide catalysts were prepared by solvothermal method. Various methods such as XRD, FT-IR, SEM, H₂-TPR, XPS and NO-TPD, were used to characterize structure, composition, surface morphology, and the redox properties of the catalysts. Their catalytic performance of the simultaneous NO and soot removal was investigated in a fixed-bed micro-reactor under atmospheric pressure. The results indicated that the La₁_-xK_xMnO₃ catalysts showed perovskite structure. For La₁_-xK_xMnO₃ catalysts, with the partial substitution of La³⁺ by K⁺ in the Mn-based perovskite lattice, a portion of Mn³⁺ was transformed into Mn⁴⁺ and the number of oxygen vacancies was increased, leading to an improvement of the redox properties and NO adsorption performance. As a result, the catalytic reactivity of La_0.80K_0.20MnO₃ catalyst was also improved, achieving the simultaneous removal of NO and soot. The maximum conversion of NO (Xmax NO) and the reaction temperature (T_max) were 46.5% and 436 ℃, respectively. The ignition temperature of soot (T_ig), peak CO₂ formation temperature (Tmax CO₂) and CO₂ selectivity (Smax CO₂) were 341℃, 454℃ and 98.8%, respectively.

Key words： Mn-based perovskite K NO soot

收稿日期: 2020-05-15

PACS:	X701
	O643.3

基金资助:国家自然科学基金（U1662103， 2167329）；燃料清洁化及高效催化减排技术北京市重点实验室项目（BZ041420180007）；国家大学生创新创业训练计划项目（2019J00100）

通讯作者: 王虹,教授,wanghong@bipt.edu.cn E-mail: wanghong@bipt.edu.cn

作者简介: 赵玉(1992-),女,河北行唐人,硕士研究生,主要从事催化化学研究.

引用本文:

赵玉, 魏波, 张鹏, 田雨, 迟姚玲, 王虹, 李翠清, 宋永吉. La₁_-_xK_xMnO₃催化剂同时消除柴油机尾气中NO和碳烟性能[J]. 中国环境科学, 2021, 41(1): 114-121. ZHAO Yu, WEI Bo, ZHANG Peng, TIAN Yu, CHI Yao-ling, WANG Hong, LI Cui-qing, SONG Yong-ji. Simultaneous removal of NO and soot from diesel engines over La₁_-xK_xMnO₃ catalysts. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 114-121.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2021/V41/I1/114

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