碳烟催化燃烧催化剂Mn/K2Ti8O17的制备、表征与催化性能

摘要针对柴油机尾气中碳烟颗粒的污染问题，设计开发了系列不同MnO_x负载量的碳烟催化剂Mn/K₂Ti₈O₁₇。采用X射线衍射（XRD）、扫描电镜（SEM）、X射线光电子能谱（XPS）、H₂程序升温还原（H₂-TPR）及碳烟程序升温还原（soot-TPR）等技术对催化剂的结构和氧化还原性能进行了表征，并利用程序升温氧化系统考察其碳烟催化活性。结果表明，载体K₂Ti₈O₁₇自身具有高活性，负载MnO_x后活性进一步提高，MnO_x最适宜的负载量为10%（质量分数，下同）。产生高活性的原因是催化剂表面MnO_x颗粒分布较均匀，与载体发生了强相互作用，产生了较多Mn⁴⁺。Mn⁴⁺在氧化还原循环中起重要的作用，所以较多的Mn⁴⁺提高了催化剂的氧化还原能力。10% Mn/K₂Ti₈O₁₇活性高的另一原因是表面活性氧（表面吸附氧）较多，氧物种流动性较好，可以很快地补充燃烧过程中消耗的吸附氧物种，从而提高反应速率。

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	翟悦媛
	曹春梅
	邢令利
	杨岳溪
	田野
	丁彤
	李新刚

关键词：碳烟催化燃烧钛酸钾锰氧化物活性氧物种

Abstract： In order to solve the problem of soot pollution in diesel emissions, a series of soot catalyst Mn/K₂Ti₈O₁₇ with varying MnO_x loadings were developed. The structure and redox properties of the catalysts were investigated by multiple techniques including X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H₂ temperature-programmed reduction (H₂-TPR), temperature-programmed reduction of soot (soot-TPR), and their soot combustion performances were evaluated in a temperature programmed oxidation system. Results show that the support K₂Ti₈O₁₇ has good catalytic performance, with enhanced activity after MnO_x is loaded, the best loading content is 10%. The excellent catalytic performance of 10% Mn/K₂Ti₈O₁₇ is attributed to the well-distributed MnO_x particles, which has strong interaction with the support, leading to the abundance of Mn⁴⁺. Mn⁴⁺ plays a key role in redox cycles, thus the best redox property of the catalyst is obtained. Another factor contributing to the activity of 10% Mn/K₂Ti₈O₁₇ is the profusion of surface absorbed oxygen as active oxygen, as well as the improved mobility of oxygen species. With good mobility of oxygen species, the consumption of absorbed oxygen in combustion process could be supplemented by the transfer of lattice oxygen, resulting in an accelerated reaction speed.

Keywords： soot； catalytic combustion； potassium titanate； manganese oxide； active oxygen species

Received 2017-03-24;

Fund:国家自然科学基金（21878213）和天津市自然科学基金（15JCZDJC37400，15JCYBJC23000）。

Corresponding Authors: 李新刚,E-mail:xingang_li@tju.edu.cn。 Email: xingang_li@tju.edu.cn

About author: 翟悦媛(1991-),女,硕士研究生,现从事环境催化方面的研究。

引用本文:

翟悦媛, 曹春梅, 邢令利, 杨岳溪, 田野, 丁彤, 李新刚.碳烟催化燃烧催化剂Mn/K₂Ti₈O₁₇的制备、表征与催化性能[J]. 化学工业与工程, 2019,36(3): 1-7

Zhai Yueyuan, Cao Chunmei, Xing Lingli, Yang Yuexi, Tian Ye, Ding Tong, Li Xingang.Preparation, Characterization and Catalytic Performance of Mn/K₂Ti₈O₁₇ Used for Soot Combustion[J]. Chemcial Industry and Engineering, 2019,36(3): 1-7

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