+高级检索
CeO2基储氧材料的制备和表征
作者:
作者单位:

1.成都大学药学与生物工程学院;2.四川大学化学学院

作者简介:

通讯作者:

中图分类号:

基金项目:


Preparation and characterization of CeO2-based oxygen storage materials
Author:
Affiliation:

1.College of Pharmacy and Biological Engineering,Chengdu University;2.College of Chemistry, Sichuan University

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    用共沉淀法制备了四种CeO2基储氧材料,并用X射线衍射(XRD),Raman,N2吸附-脱附(BET方法),H2程序升温还原(H2-TPR),氧脉冲技术,X射线光电子能谱(XPS)和扫描电子显微镜(SEM)表征了其物理化学性质。XRD结果表明在CeO2 和CeO2-Al2O3 (CA)中只能检测到宽的CeO2 的特征峰,而CeO2-ZrO2 (CZ) 和 CeO2-ZrO2-Al2O3 (CZA)中检测到了Ce0.75Zr0.25O2 相,在所有的CeO2基储氧材料中都形成了均匀的固溶体。XPS结果表明三价铈和四价铈共存于CZ,CA和CZA的表面,而在纯CeO2中几乎检测不到三价铈的存在。CZA表现出了最佳的织构性能,高的储氧量(OSC)和优异的热稳定性。另外,为了阐释四个样品的差异,本文提出了一种新的观点:Al3+可能插入了萤石结构的间隙或者高度分散在固溶体中。CZA固溶体可能是由间隙型固溶体和置换型固溶体混合组成的,这一点由CA和CZA中存在两种不同的氧物种或者两种类型的氧通道可以证明。然而,关于这个观点的详细证据还不够充分,需要继续进行深入的研究。

    Abstract:

    Four types of CeO2-based oxide samples were prepared by co-precipitation, and their physicochemical properties were characterized by X-ray diffraction (XRD), Raman spectroscopy, N2 adsorption-desorption (Brunauer-Emmet-Teller method; BET), H2-temperature-programmed reduction (H2-TPR), oxygen pulsing technique, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). XRD profiles revealed that only broad diffraction lines characteristic of CeO2 were observed in the case of CeO2 and CeO2-Al2O3 (CA), while CeO2-ZrO2 (CZ) and CeO2-ZrO2-Al2O3 (CZA) disclosed Ce0.75Zr0.25O2 phase. The paper revealed that homogeneous solid solutions were formed for all the CeO2-based oxygen storage materials. XPS studies showed that 4+ and 3+ oxidation states of cerium were coexisted on the surface of CZ, CA and CZA However, almost no 3+ oxidation state was detected for pure CeO2. The best textural properties, higher oxygen storage capacity (OSC) and excellent thermal stability were obtained for CZA. In addition to compare the differences among the four samples, this article proposed a new insight that Al3+ might insert among the inter-space of the fluorite structure or highly dispersed in the solid solution. CZA solid solution might be composed of interstitial solid solution and substitutional solid solution, which was verified by the presence of two oxygen species or two types of oxygen channels for CA and CZA. However, the evidence was not detailed enough to sustain this argument, so that further investigation was necessary.

    参考文献
    相似文献
    引证文献
引用本文

李红梅,兰丽,刘达玉,王卫,薛慧玲,漆文胜,龚茂初,陈耀强. CeO2基储氧材料的制备和表征[J].稀有金属材料与工程,2020,49(3):769~777.[Li Hong-Mei, Lan Li, Liu Da-Yu, Wang Wei, Xue Hui-Ling, Qi Wen-Sheng, Gong Mao-Chu, Chen Yao-Qiang. Preparation and characterization of CeO2-based oxygen storage materials[J]. Rare Metal Materials and Engineering,2020,49(3):769~777.]
DOI:10.12442/j. issn.1002-185X.20170192

复制
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2017-03-14
  • 最后修改日期:2018-07-26
  • 录用日期:2018-07-27
  • 在线发布日期: 2020-04-08
  • 出版日期: