Powdered microporous glasses: changing porosity through aging

Detalhes bibliográficos
Autor(a) principal: Perruso,Carlos Renato
Data de Publicação: 1998
Outros Autores: Alcover Neto,Arnaldo, Neumann,Reiner, Nascimento,Regina Sandra Veiga, Fonseca,Marcus Vinicius de Araujo
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Cerâmica (São Paulo. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69131998000500002
Resumo: Recently, we have reported the production of a microporous high purity silica powder from the acid leaching of glasses with average pore size around 2.5nm and specific surface area of 420m2/g (BET). The employed glasses derived from the melting of two types of waste from the industrial processing of Brazilian oil shale (retorted oil shale and the top fraction of the intermediate layer of Irati Formation). Depending on the proportion of the two wastes employed in the formulation of the glasses, either a silica gel or a powdered one is obtained, after leaching. The acid leaching of those glasses with hydrochloric acid, at 90 °C, was used to produce powdered microporous silica. In the present work it is studied the effect of aging time and temperature on the morphology and structure of the obtained powdered silica. Aging studies were performed in two different media, an acidic (hydrochloric acid) and a basic one (ammonium hydroxide) for different periods of time and temperatures. XRD, SEM/EDX, TEM, specific surface area measurements and DTA/TGA were used to characterize these materials. The results have shown a decrease of specific surface area with increasing time and temperature. Apparently, this behavior may be associated with dissolution and re-precipitation mechanisms.
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spelling Powdered microporous glasses: changing porosity through agingglass leachingmicroporous silicaRecently, we have reported the production of a microporous high purity silica powder from the acid leaching of glasses with average pore size around 2.5nm and specific surface area of 420m2/g (BET). The employed glasses derived from the melting of two types of waste from the industrial processing of Brazilian oil shale (retorted oil shale and the top fraction of the intermediate layer of Irati Formation). Depending on the proportion of the two wastes employed in the formulation of the glasses, either a silica gel or a powdered one is obtained, after leaching. The acid leaching of those glasses with hydrochloric acid, at 90 °C, was used to produce powdered microporous silica. In the present work it is studied the effect of aging time and temperature on the morphology and structure of the obtained powdered silica. Aging studies were performed in two different media, an acidic (hydrochloric acid) and a basic one (ammonium hydroxide) for different periods of time and temperatures. XRD, SEM/EDX, TEM, specific surface area measurements and DTA/TGA were used to characterize these materials. The results have shown a decrease of specific surface area with increasing time and temperature. Apparently, this behavior may be associated with dissolution and re-precipitation mechanisms.Associação Brasileira de Cerâmica1998-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69131998000500002Cerâmica v.44 n.289 1998reponame:Cerâmica (São Paulo. Online)instname:Universidade de São Paulo (USP)instacron:USP10.1590/S0366-69131998000500002info:eu-repo/semantics/openAccessPerruso,Carlos RenatoAlcover Neto,ArnaldoNeumann,ReinerNascimento,Regina Sandra VeigaFonseca,Marcus Vinicius de Araujoeng2000-06-12T00:00:00Zoai:scielo:S0366-69131998000500002Revistahttps://www.scielo.br/j/ce/PUBhttps://old.scielo.br/oai/scielo-oai.phpceram.abc@gmail.com||ceram.abc@gmail.com1678-45530366-6913opendoar:2000-06-12T00:00Cerâmica (São Paulo. Online) - Universidade de São Paulo (USP)false
dc.title.none.fl_str_mv Powdered microporous glasses: changing porosity through aging
title Powdered microporous glasses: changing porosity through aging
spellingShingle Powdered microporous glasses: changing porosity through aging
Perruso,Carlos Renato
glass leaching
microporous silica
title_short Powdered microporous glasses: changing porosity through aging
title_full Powdered microporous glasses: changing porosity through aging
title_fullStr Powdered microporous glasses: changing porosity through aging
title_full_unstemmed Powdered microporous glasses: changing porosity through aging
title_sort Powdered microporous glasses: changing porosity through aging
author Perruso,Carlos Renato
author_facet Perruso,Carlos Renato
Alcover Neto,Arnaldo
Neumann,Reiner
Nascimento,Regina Sandra Veiga
Fonseca,Marcus Vinicius de Araujo
author_role author
author2 Alcover Neto,Arnaldo
Neumann,Reiner
Nascimento,Regina Sandra Veiga
Fonseca,Marcus Vinicius de Araujo
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Perruso,Carlos Renato
Alcover Neto,Arnaldo
Neumann,Reiner
Nascimento,Regina Sandra Veiga
Fonseca,Marcus Vinicius de Araujo
dc.subject.por.fl_str_mv glass leaching
microporous silica
topic glass leaching
microporous silica
description Recently, we have reported the production of a microporous high purity silica powder from the acid leaching of glasses with average pore size around 2.5nm and specific surface area of 420m2/g (BET). The employed glasses derived from the melting of two types of waste from the industrial processing of Brazilian oil shale (retorted oil shale and the top fraction of the intermediate layer of Irati Formation). Depending on the proportion of the two wastes employed in the formulation of the glasses, either a silica gel or a powdered one is obtained, after leaching. The acid leaching of those glasses with hydrochloric acid, at 90 °C, was used to produce powdered microporous silica. In the present work it is studied the effect of aging time and temperature on the morphology and structure of the obtained powdered silica. Aging studies were performed in two different media, an acidic (hydrochloric acid) and a basic one (ammonium hydroxide) for different periods of time and temperatures. XRD, SEM/EDX, TEM, specific surface area measurements and DTA/TGA were used to characterize these materials. The results have shown a decrease of specific surface area with increasing time and temperature. Apparently, this behavior may be associated with dissolution and re-precipitation mechanisms.
publishDate 1998
dc.date.none.fl_str_mv 1998-10-01
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=S0366-69131998000500002
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69131998000500002
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0366-69131998000500002
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 Associação Brasileira de Cerâmica
publisher.none.fl_str_mv Associação Brasileira de Cerâmica
dc.source.none.fl_str_mv Cerâmica v.44 n.289 1998
reponame:Cerâmica (São Paulo. Online)
instname:Universidade de São Paulo (USP)
instacron:USP
instname_str Universidade de São Paulo (USP)
instacron_str USP
institution USP
reponame_str Cerâmica (São Paulo. Online)
collection Cerâmica (São Paulo. Online)
repository.name.fl_str_mv Cerâmica (São Paulo. Online) - Universidade de São Paulo (USP)
repository.mail.fl_str_mv ceram.abc@gmail.com||ceram.abc@gmail.com
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