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

Química Nova

Pereira, Alexandre Luiz de Souza¹  Instituto de Engenharia Nuclear, Rio de Janeiro, Brasil¹  Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil¹  Afonso, Júlio Carlos¹  Silva, Cristiano Nunes da¹  Mantovano, José Luiz¹ 

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】

Unknown