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Rare Metals

, Volume 38, Issue 1, pp 1–13 | Cite as

Recovery and regeneration of Al2O3 with a high specific surface area from spent hydrodesulfurization catalyst CoMo/Al2O3

  • Qi Liu
  • Wen-Qiang Wang
  • Yue Yang
  • Xue-Gang Liu
  • Sheng-Ming XuEmail author
Article
  • 46 Downloads

Abstract

Aluminum recovery is a key issue for the overall recycling of valuable metals from spent catalysts. This paper focuses on the recovery and regeneration of alumina with high additional value from the spent hydrodesulfurization catalyst CoMo/Al2O3. The results indicate that 98.13% alumina is successfully leached from the treated spent catalysts by an alkaline leaching process under the conditions of 5 mol·L−1 sodium hydroxide, a liquid/solid ratio of 20 ml·g−1, a temperature of 160 °C and a reaction time of 4 h. In the leaching residue, no difficult leaching compound is found and cobalt and nickel are enriched, both of which are conducive to the subsequent metal recovery step. The reaction order of aluminum leaching is 0.99. This reaction fits well with the interfacial chemical reaction model, and its apparent activation energy is calculated as 45.50 kJ·mol−1. Subsequently, γ-Al2O3 with a high specific surface area of 278.3 m2·g−1, a mean size of 2.2 μm and an average pore size of 3.10 nm is then regenerated from the lixivium, indicating its suitability for use as a catalyst carrier. The recovery and regeneration of alumina from spent catalysts can not only significantly contribute to the total recycling of such hazardous spent catalysts but also provide a new approach for the preparation of γ-Al2O3 with a high specific surface area using spent catalysts as the aluminum sources.

Keywords

Spent catalysts CoMo/Al2O3 Aluminum leaching Regeneration γ-Al2O3 

Notes

Acknowledgements

This study was financially supported by the National Natural Science Commission-Yunnan Joint Fund Project (No. U1402274).

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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Institute of Nuclear and New Energy Technology, Tsinghua UniversityBeijingChina
  2. 2.Beijing Key Laboratory of Fine CeramicsTsinghua UniversityBeijingChina
  3. 3.School of Minerals Processing and BioengineeringCentral South UniversityChangshaChina

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