堇青石/硼酸铝晶须/Co0.8FexCe0.2-xCr2O4催化剂的制备及其碳烟过滤-催化燃烧性能研究

doi:10.15541/jim20250250

摘要/Abstract

摘要： 随着尾气排放法规的日益严格,对柴油机尾气颗粒物过滤器（DPF）的过滤精度提出了更高的要求,传统的DPF过滤器难以满足尾气中纳米颗粒精密过滤的需求。本研究以堇青石蜂窝陶瓷为基体,采用十六烷基二甲基溴化铵（CTAB）辅助共沉淀法在硼酸铝晶须上负载Co_0.8Fe_xCe_0.2-_xCr₂O₄系列尖晶石型催化剂。独特的“纤毛状晶须增强过滤-双金属掺杂催化氧化”分级结构设计实现了高效过滤性能和低温催化性能的结合,可在较低的温度下实现碳烟颗粒的催化氧化,Fe与Ce共掺杂产生了显著的协同效应,提高了催化剂表面氧物种（氧空位、Co³⁺、Cr⁶⁺）的浓度,增强了反应活性。负载C_0.8F_0.15C_0.05C₂催化剂（Z/C_0.8F_0.15C_0.05C₂-CT）使碳烟颗粒转化率达到50%对应的温度（T₅₀=446 ℃）显著优于原始堇青石（T₅₀=567 ℃）。5次循环测试表明该催化剂具有良好的稳定性和CO₂选择性（86%~94%）。这种独特的分级结构有效实现了高效颗粒过滤与低温催化燃烧性能的统一,在柴油机颗粒过滤器(DPF)领域具有潜在的应用前景。

关键词: 碳烟颗粒, 堇青石, 硼酸铝晶须, 催化氧化, 过滤

Abstract: With the increasingly strict regulations on exhaust emissions, the higher requirements have been built for the filtration of diesel particulate filters (DPF), and traditional DPF filters can not match the demand for precise filtration of nanoparticles in exhaust. In this study, Co_0.8Fe_xCe_0.2-_xCr₂O₄ series spinel-type catalyst was loaded on aluminum borate whiskers by hexadecyl dimethyl ammonium bromide (CTAB)-assisted co-precipitation method. The unique hierarchical microstructure design of “whisker enhanced filter-bimetallic doping catalytic oxidation” achieves a combination of efficient filtration performance and low-temperature catalytic performance, enabling catalytic oxidation of carbon soot particles at lower temperatures. Fe and Ce co-doping produces significant synergistic effects, increasing the concentrations of oxygen species (oxygen vacancies, Co³⁺ and Cr⁶⁺) on the catalyst surface and enhancing reaction activity. This hierarchically microstructure integrates the efficient filtration performance and low-temperature catalytic performance together, which demonstrates the catalytic purification of soot particles at lower temperature, and the co-doping of Fe and Ce produces a significant synergistic effect, optimizing the concentration and reactivity of oxygen species (oxygen vacancy, Co³⁺, Cr⁶⁺) on the surface of the catalyst. The temperature of carbon soot particles 50% conversion (T₅₀=446 ℃) was significantly better than that of the blank cordierite sample (T₅₀=567 ℃). Five cyclic stability testing shows that the catalysts have good stability and CO₂ selectivity (86%-94%). This unique hierarchical microstructure effectively shows a unity of efficient particle filtration and low temperature catalytic combustion performance, and has potential application in the field of diesel particulate filter (DPF).

Key words: soot particle, cordierite, aluminum borate whisker, catalytic oxidation, filtration

中图分类号:

TQ174

张梦婕, 李智博, 黄瑞楠, 吕向菲, 王伟. 堇青石/硼酸铝晶须/Co_0.8Fe_xCe_0.2-_xCr₂O₄催化剂的制备及其碳烟过滤-催化燃烧性能研究[J]. 无机材料学报, DOI: 10.15541/jim20250250.

ZHANG Mengjie, LI Zhibo, HUANG Ruinan, LÜ Xiangfei, WANG Wei. Preparation of Cordierite/Aluminum Borate Whiskers/Co_0.8Fe_xCe_0.2-_xCr₂o₄ Catalysts and Filtration Catalytic Performance for Carbon Soot[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20250250.

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堇青石/硼酸铝晶须/Co_0.8Fe_xCe_0.2-_xCr₂O₄催化剂的制备及其碳烟过滤-催化燃烧性能研究

Preparation of Cordierite/Aluminum Borate Whiskers/Co_0.8Fe_xCe_0.2-_xCr₂o₄ Catalysts and Filtration Catalytic Performance for Carbon Soot

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