Química Nova | |
The importance of pre-treatment of spent hydrotreating catalysts on metals recovery | |
Alexandre Luiz De Souza Pereira2  Cristiano Nunes Da Silva2  Júlio Carlos Afonso2  José Luiz Mantovano1  | |
[1] ,Universidade Federal do Rio de Janeiro Instituto de Química Departamento de Química AnalíticaRio de Janeiro RJ ,Brasil | |
关键词: spent catalyst; metals recovery; foulant elements; | |
DOI : 10.1590/S0100-40422011000100027 | |
来源: SciELO | |
【 摘 要 】
This work describes a three-step pre-treatment route for processing spent commercial NiMo/Al2O3 catalysts. Extraction of soluble coke with n-hexane and/or leaching of foulant elements with oxalic acid were performed before burning insoluble coke under air. Oxidized catalysts were leached with 9 mol L-1 sulfuric acid. Iron was the only foulant element partially leached by oxalic acid. The amount of insoluble matter in sulfuric acid was drastically reduced when iron and/or soluble coke were previously removed. Losses of active phase metals (Ni, Mo) during leaching with oxalic acid were compensated by the increase of their recovery in the sulfuric acid leachate.
【 授权许可】
CC BY-NC
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License
【 预 览 】
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RO202103040063475ZK.pdf | 191KB | download |