CeO<sub>2</sub> nanoclusters stabilized in aerogel matrix as catalysts for Cl<sub>2</sub> production from HCl oxidation

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CeO₂ nanoclusters stabilized in aerogel matrix as catalysts for Cl₂ production from HCl oxidation

更新时间：2025-12-10

- CeO₂ nanoclusters stabilized in aerogel matrix as catalysts for Cl₂ production from HCl oxidation
- CIESC Journal Issue 9, Pages: 3421-3427(2015)
- 作者机构：
  
  1. 南京工业大学材料化学工程国家重点实验室,江苏,南京,210009
  2. 南京工业大学化工学院,江苏,南京,210009
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20150902
  CLC： 643
- Online First：05 September 2015，
  
  Published：05 September 2015
- 稿件说明：
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XU Xihua, FEI Zhaoyang, CHEN Xian, et al. CeO₂ nanoclusters stabilized in aerogel matrix as catalysts for Cl₂ production from HCl oxidation[J]. CIESC Journal, 2015, (9): 3421-3427. DOI: 10.11949/j.issn.0438-1157.20150902.
DOI：

XU Xihua, FEI Zhaoyang, CHEN Xian, et al. CeO₂ nanoclusters stabilized in aerogel matrix as catalysts for Cl₂ production from HCl oxidation[J]. CIESC Journal, 2015, (9): 3421-3427. DOI: 10.11949/j.issn.0438-1157.20150902. DOI：

摘要

采用一步溶胶-凝胶法制备了镶嵌于气凝胶骨架内的CeO2纳米团簇催化材料(CeO2@MxOy

MxOy= SiO2、ZrO2、Al2O3)用于HCl催化氧化反应。镶嵌于气凝胶骨架内的CeO2纳米团簇显著的量子尺寸效应导致其表现出不同于晶相CeO2的特性

H2-TPR测试结果显示在晶相CeO2表面氧物种还原温区内CeO2纳米团簇即可被充分还原。优异的氧化还原性能导致CeO2@MxOy在HCl氧化过程具有良好的催化活性

其中

40CeO2@SiO2的活性最高

在接触时间为0.1598 h

VO2/VHCl为1

430℃时

Cl2空时产率可以达到2.10 g·(g cat)-1·h-1。催化剂表面的HCl氧化反应同时受O2分压和HCl分压的影响

这表明Cl2从催化剂表面的脱附是该反应的决速步骤。

Abstract

CeO2 nanoclusters inserted into aerogel matrix (CeO2@MxOy

MxOy= SiO2

ZrO2

Al2O3) prepared by a single-step sol-gel method were used as catalysts for recycling Cl2 from HCl oxidation. Due to their remarkable quantum-size effects

the properties of CeO2 nanoclusters were significantly different from crystal phase CeO2. The CeO2 nanoclusters could be completely reduced at the temperature range for reduction of the surface oxygen species of crystal phase CeO2. The unique properties of CeO2 nanoclusters resulted in the high activity of CeO2@MxOy in the process of HCl oxidation reaction. 40CeO2@SiO2 exhibited the highest activity and the STY (space time yield of Cl2) reached to 2.10 g·(g cat)-1·h-1 at 430℃ with VO2/VHCl of 1 and contact time of 0.1598 h. Kinetic studies showed that both O2 and HCl competed for the active sites rendering desorption of surface Cl as the rate-determining step.

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