Processing of spent NiW/Al2O3 catalysts

Detalhes bibliográficos
Autor(a) principal: Paulino,Jéssica Frontino
Data de Publicação: 2013
Outros Autores: Afonso,Julio Carlos, Cunha,José Waldemar Silva Dias da
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000500016
Resumo: Spent oxidized (500 ºC, 5 h) commercial NiW/Al2O3 catalysts were processed using two different routes: a) fusion with NaOH (650 ºC, 1 h), the roasted mass was leached in water; b) leaching with HCl or H2SO4 (70 ºC, 1-3 h). HCl was the best leachant. In both routes, soluble tungsten was extracted at pH 1 with Alamine 336 (10 vol.% in kerosene) and stripped with 2 mol L-1 NH4OH (25 ºC, one stage, aqueous/organic ratio = 1 v/v). Tungsten was isolated as ammonium paratungstate at very high yield (> 97.5%). The elements were better separated using the acidic route.
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spelling Processing of spent NiW/Al2O3 catalystsspent catalystsmetal recoveryNi-W catalystSpent oxidized (500 ºC, 5 h) commercial NiW/Al2O3 catalysts were processed using two different routes: a) fusion with NaOH (650 ºC, 1 h), the roasted mass was leached in water; b) leaching with HCl or H2SO4 (70 ºC, 1-3 h). HCl was the best leachant. In both routes, soluble tungsten was extracted at pH 1 with Alamine 336 (10 vol.% in kerosene) and stripped with 2 mol L-1 NH4OH (25 ºC, one stage, aqueous/organic ratio = 1 v/v). Tungsten was isolated as ammonium paratungstate at very high yield (> 97.5%). The elements were better separated using the acidic route.Sociedade Brasileira de Química2013-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000500016Química Nova v.36 n.5 2013reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40422013000500016info:eu-repo/semantics/openAccessPaulino,Jéssica FrontinoAfonso,Julio CarlosCunha,José Waldemar Silva Dias daeng2013-07-18T00:00:00Zoai:scielo:S0100-40422013000500016Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2013-07-18T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Processing of spent NiW/Al2O3 catalysts
title Processing of spent NiW/Al2O3 catalysts
spellingShingle Processing of spent NiW/Al2O3 catalysts
Paulino,Jéssica Frontino
spent catalysts
metal recovery
Ni-W catalyst
title_short Processing of spent NiW/Al2O3 catalysts
title_full Processing of spent NiW/Al2O3 catalysts
title_fullStr Processing of spent NiW/Al2O3 catalysts
title_full_unstemmed Processing of spent NiW/Al2O3 catalysts
title_sort Processing of spent NiW/Al2O3 catalysts
author Paulino,Jéssica Frontino
author_facet Paulino,Jéssica Frontino
Afonso,Julio Carlos
Cunha,José Waldemar Silva Dias da
author_role author
author2 Afonso,Julio Carlos
Cunha,José Waldemar Silva Dias da
author2_role author
author
dc.contributor.author.fl_str_mv Paulino,Jéssica Frontino
Afonso,Julio Carlos
Cunha,José Waldemar Silva Dias da
dc.subject.por.fl_str_mv spent catalysts
metal recovery
Ni-W catalyst
topic spent catalysts
metal recovery
Ni-W catalyst
description Spent oxidized (500 ºC, 5 h) commercial NiW/Al2O3 catalysts were processed using two different routes: a) fusion with NaOH (650 ºC, 1 h), the roasted mass was leached in water; b) leaching with HCl or H2SO4 (70 ºC, 1-3 h). HCl was the best leachant. In both routes, soluble tungsten was extracted at pH 1 with Alamine 336 (10 vol.% in kerosene) and stripped with 2 mol L-1 NH4OH (25 ºC, one stage, aqueous/organic ratio = 1 v/v). Tungsten was isolated as ammonium paratungstate at very high yield (> 97.5%). The elements were better separated using the acidic route.
publishDate 2013
dc.date.none.fl_str_mv 2013-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000500016
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000500016
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0100-40422013000500016
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Química Nova v.36 n.5 2013
reponame:Química Nova (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Química Nova (Online)
collection Química Nova (Online)
repository.name.fl_str_mv Química Nova (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv quimicanova@sbq.org.br
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