Quimica nova | |
The importance of pre-treatment of spent hydrotreating catalysts on metals recovery | |
Mantovano, José Luiz1  Pereira, Alexandre Luiz de Souza2  Afonso, Júlio Carlos2  Silva, Cristiano Nunes da2  | |
[1] Instituto de Engenharia Nuclear, Rio de Janeiro, Brasil;Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil | |
关键词: spent catalyst; metals recovery; foulant elements.; | |
DOI : 10.1590/S0100-40422011000100027 | |
学科分类:化学(综合) | |
来源: Sociedade Brasileira de Quimica | |
【 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
【 预 览 】
Files | Size | Format | View |
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RO201902013204595ZK.pdf | 191KB | download |