CeO<sub>2</sub>的微观结构对颗粒物催化氧化的影响

doi:10.11901/1005.3093.2016.483

材料研究学报

2017, Vol. 31

Issue (12): 955-960 DOI: 10.11901/1005.3093.2016.483

研究论文

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CeO₂的微观结构对颗粒物催化氧化的影响

叶松, 孙平(

), 刘军恒, 黄河

江苏大学汽车与交通工程学院镇江 212013

Effect of Microstructure of CeO₂ Particles on Catalyzing Oxidation of Diesel Particulate Matter

Song YE, Ping SUN(

), Junheng LIU, He HUANG

School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China

引用本文:

叶松, 孙平, 刘军恒, 黄河. CeO₂的微观结构对颗粒物催化氧化的影响[J]. 材料研究学报, 2017, 31(12): 955-960.
Song YE, Ping SUN, Junheng LIU, He HUANG. Effect of Microstructure of CeO₂ Particles on Catalyzing Oxidation of Diesel Particulate Matter[J]. Chinese Journal of Materials Research, 2017, 31(12): 955-960.

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摘要:

用沉淀法制备出三组CeO₂,使用X-射线粉末衍射(XRD)、氮气吸附脱附、扫描电镜(SEM)、氢气程序升温还原(H₂-TPR)等手段表征其微观结构及氧物种,并根据热重分析(TGA)评价其活性。结果表明:三组CeO₂的亚晶尺寸分别为8 nm、11 nm和20 nm,对应的比表面积分别为89 m²/g、68 m²/g和63 m²/g,表面孔容孔径的变化趋势与比表面积一致。相比柴油机纯颗粒物,添加具有不同微观结构的CeO₂能促进颗粒物中过渡态碳烟前驱体的氧化燃烧,干碳烟的失重起始温度依次降低了152℃、137℃和121℃,失重峰值温度降低了187℃、110℃和103℃,并且最大失重率增大。CeO₂的微观结构对其氧空位的形成有较大影响,CeO₂晶体的亚晶尺寸越小、比表面积越大在颗粒物氧化中表现出更高的活性.

关键词 ：无机非金属材料, 微观结构, 催化氧化物, 热重分析, CeO₂, 颗粒物

Abstract：

Three type of CeO₂particles was produced by precipitation method. Then the microstructure and oxygen species of CeO₂ particles were characterized by means of XRD, nitrogen adsorption, SEM and H₂-TPR. While their catalytic activity was evaluated by thermogravimetric analysis(TGA). Results show that the subgrain dimensions of the prepared three types of CeO₂ are 8 nm, 11 nm and 20 nm and the corresponding BET surface areas are 89m²/g, 68m²/g and 63m²/grespectively. The pore volumes and diameters of CeO₂ particles consistently changed with BET surface areas. In comparison with the plain diesel particulate matter (PM), the ones with addition of CeO₂particles could exhibited higher activity for the oxidation of transitional soot precursor within PM, correspondingly the temperature related with the initial mass-loss of dry soot decreased by 152℃、137℃ and 121℃ and the temperature of the mass-loss peak decreased by 187℃、110℃ and 103℃ respectively, meanwhile the peak mass-loss rate increased. The microstructure of CeO₂particles played a significant role in the formation of oxygen lattice vacancy. In general, CeO₂particles has smaller subgrain size and larger BET surface areas, thus will exhibited better catalytic activity for the oxidation of PM.

Key words： inorganic non-metallic materials micro-structure catalyzing oxidation thermogravimetric analysis CeO₂ particulate matter

收稿日期: 2016-08-15

ZTFLH:

TB321

基金资助:江苏省自然科学基金(BK20160538),江苏省高校自然科学研究重大项目(14KJA470001)

作者简介:

作者简介叶松,男,1992年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.483 或 https://www.cjmr.org/CN/Y2017/V31/I12/955

图1 CeO2样品的XRD图谱

图2 CeO2样品的SEM对比图像

表1 CeO2样品的比表面积、孔容及孔径

图3 CeO2样品的H2-TPR图谱

表2 柴油机颗粒失重特征参数

图4 不同微观结构CeO2与颗粒混合的TG、DTG曲线

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