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Tipo: article
Título: 2010The Importance of Pre-Treatment of Spent Hydrotreating Catalysts on Metals Recovery
Autor(es): PEREIRA, Alexandre Luiz de Souza
SILVA, Cristiano Nunes da
AFONSO, Júlio Carlos
Resumo: 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.
Palavras-chave: Spent Catalyst
Metals Recovery
Foulant Elements.
Idioma: eng
País: Brasil
Editor: Instituto de Engenharia Nuclear
Sigla da Instituição: IEN
Tipo de Acesso: openAccess
Data do documento: 17-Sep-2010
Appears in Collections:Radioquímica e Química Nuclear - Artigos de Periódicos

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