The importance of pre-treatment of spent hydrotreating catalysts on metals recovery

Química Nova

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】

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