Determination of Total Acid in Palygorskite Chemically Modified by N-Butylamine Thermodesorption

Detalhes bibliográficos
Autor(a) principal: Ruiz,Juan A.C.
Data de Publicação: 2002
Outros Autores: Melo,Dulce M.A., Souza,José R., Alcazar,Leopoldo O.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Materials research (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392002000200014
Resumo: The acid properties of palygorskite clay (R1) were studied using n-butylamine as probe molecule. A comparison was made of these properties in palygorskite clay (R1), in an acidified palygorskite (R2) and in acid palygorskite loaded with 2% of lanthanum (R3). The total acid properties were determined by FTIR (Fourier Transform Infrared) and TG-DTA (thermogravimetry). The acidity increased as follows: R3>R2>R1. The acid strength sites were classified as physisorbed, weak, medium and strong. The acid treatment did not change the site distribution, apparently only removing channel impurities. The introduction of lanthanum created many more acid sites and increased the specific area. Both weak and strong sites, which increased significantly, were considered new active acid sites produced by the lanthanum.
id ABMABCABPOL-1_b5b2a9b36128a4f12da7d155475462ba
oai_identifier_str oai:scielo:S1516-14392002000200014
network_acronym_str ABMABCABPOL-1
network_name_str Materials research (São Carlos. Online)
repository_id_str
spelling Determination of Total Acid in Palygorskite Chemically Modified by N-Butylamine Thermodesorptionpalygorskitelanthanumthermodesorptionacid catalystThe acid properties of palygorskite clay (R1) were studied using n-butylamine as probe molecule. A comparison was made of these properties in palygorskite clay (R1), in an acidified palygorskite (R2) and in acid palygorskite loaded with 2% of lanthanum (R3). The total acid properties were determined by FTIR (Fourier Transform Infrared) and TG-DTA (thermogravimetry). The acidity increased as follows: R3>R2>R1. The acid strength sites were classified as physisorbed, weak, medium and strong. The acid treatment did not change the site distribution, apparently only removing channel impurities. The introduction of lanthanum created many more acid sites and increased the specific area. Both weak and strong sites, which increased significantly, were considered new active acid sites produced by the lanthanum.ABM, ABC, ABPol2002-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392002000200014Materials Research v.5 n.2 2002reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/S1516-14392002000200014info:eu-repo/semantics/openAccessRuiz,Juan A.C.Melo,Dulce M.A.Souza,José R.Alcazar,Leopoldo O.eng2002-09-05T00:00:00Zoai:scielo:S1516-14392002000200014Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2002-09-05T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.fl_str_mv Determination of Total Acid in Palygorskite Chemically Modified by N-Butylamine Thermodesorption
title Determination of Total Acid in Palygorskite Chemically Modified by N-Butylamine Thermodesorption
spellingShingle Determination of Total Acid in Palygorskite Chemically Modified by N-Butylamine Thermodesorption
Ruiz,Juan A.C.
palygorskite
lanthanum
thermodesorption
acid catalyst
title_short Determination of Total Acid in Palygorskite Chemically Modified by N-Butylamine Thermodesorption
title_full Determination of Total Acid in Palygorskite Chemically Modified by N-Butylamine Thermodesorption
title_fullStr Determination of Total Acid in Palygorskite Chemically Modified by N-Butylamine Thermodesorption
title_full_unstemmed Determination of Total Acid in Palygorskite Chemically Modified by N-Butylamine Thermodesorption
title_sort Determination of Total Acid in Palygorskite Chemically Modified by N-Butylamine Thermodesorption
author Ruiz,Juan A.C.
author_facet Ruiz,Juan A.C.
Melo,Dulce M.A.
Souza,José R.
Alcazar,Leopoldo O.
author_role author
author2 Melo,Dulce M.A.
Souza,José R.
Alcazar,Leopoldo O.
author2_role author
author
author
dc.contributor.author.fl_str_mv Ruiz,Juan A.C.
Melo,Dulce M.A.
Souza,José R.
Alcazar,Leopoldo O.
dc.subject.por.fl_str_mv palygorskite
lanthanum
thermodesorption
acid catalyst
topic palygorskite
lanthanum
thermodesorption
acid catalyst
description The acid properties of palygorskite clay (R1) were studied using n-butylamine as probe molecule. A comparison was made of these properties in palygorskite clay (R1), in an acidified palygorskite (R2) and in acid palygorskite loaded with 2% of lanthanum (R3). The total acid properties were determined by FTIR (Fourier Transform Infrared) and TG-DTA (thermogravimetry). The acidity increased as follows: R3>R2>R1. The acid strength sites were classified as physisorbed, weak, medium and strong. The acid treatment did not change the site distribution, apparently only removing channel impurities. The introduction of lanthanum created many more acid sites and increased the specific area. Both weak and strong sites, which increased significantly, were considered new active acid sites produced by the lanthanum.
publishDate 2002
dc.date.none.fl_str_mv 2002-06-01
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=S1516-14392002000200014
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392002000200014
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1516-14392002000200014
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 ABM, ABC, ABPol
publisher.none.fl_str_mv ABM, ABC, ABPol
dc.source.none.fl_str_mv Materials Research v.5 n.2 2002
reponame:Materials research (São Carlos. Online)
instname:Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
instname_str Universidade Federal de São Carlos (UFSCAR)
instacron_str ABM ABC ABPOL
institution ABM ABC ABPOL
reponame_str Materials research (São Carlos. Online)
collection Materials research (São Carlos. Online)
repository.name.fl_str_mv Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)
repository.mail.fl_str_mv dedz@power.ufscar.br
_version_ 1754212656960503808

Registros relacionados