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The role of surface hydroxyl concentration on calcinated alumina in catalytic ozonation

  • Yu Li
  • Jie Xu
  • Mengqian Qian
  • Jie Yu
  • Jian Pan
  • Baohong GuanEmail author
Research Article
  • 108 Downloads

Abstract

Alumina has been used as a catalyst for ozonation, surface hydroxyl on which is regarded as the active center for ozone attack, but the influences of hydroxyl generation are still vague. Here, we prepared alumina with different hydroxyl concentrations by adjusting calcination temperatures, of which the catalytic activity was evaluated with the mineralization degree of phenol, and then revealed the active sites of hydroxyl generation with characterization of XRD, Py-IR, and NH3-TPD. The results show that the greater the hydroxyl concentration, the higher the catalytic activity, demonstrating that surface hydroxyl contributes to its catalytic activity. The effect of calcination temperatures on hydroxyl concentration and catalytic activity is in accordance with the amount of weak Lewis acid sites on the surface of alumina, illustrating the surface hydroxyl derived from the decomposition of water adsorbed on weak Lewis acid sites. However, the catalytic performance of the alumina decreases slowly in a long-term reaction owing to the active center reduction resulted from the coverage by organic acids from phenol degradation. The present work reveals the influences of hydroxyl generation which are beneficial for adjusting surface hydroxyl regarded as active site for ozone attack and the reason of catalyst deactivation, which provides guideline for the rational design of catalyst.

Keywords

Catalytic ozonation Alumina Calcination Lewis acid sites Hydroxyl groups Phenol 

Notes

Funding information

The work was supported by the National Key Research and Development Program of China (Project No. 2016YFB0301800) and Public Welfare Project of the Science and Technology Department of Zhejiang Province (Project No. 2015C33029).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

11356_2019_4909_MOESM1_ESM.docx (4.8 mb)
ESM 1 (DOCX 4908 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yu Li
    • 1
  • Jie Xu
    • 1
  • Mengqian Qian
    • 1
  • Jie Yu
    • 2
  • Jian Pan
    • 3
  • Baohong Guan
    • 1
    Email author
  1. 1.College of Environmental and Resource SciencesZhejiang UniversityHangzhouChina
  2. 2.Faculty of Architectural Civil Engineering and EnvironmentNingbo UniversityNingboChina
  3. 3.Environmental Technology Innovation Center of JiandeHangzhouChina

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