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dc.contributor.authorFasolo, Wanderson Vittorazzi-
dc.date.accessioned2026-09-28T12:26:04Z-
dc.date.available2026-09-28T12:26:04Z-
dc.date.issued2006-
dc.identifier.citationFASOLO, Wanderson Vittorazzi. Peneiras moleculares MCM-41 apresentando propriedades ácidas obtidas por várias técnicas. 2006. 44 f. Dissertação (Mestrado em Engenharia Química) - Instituto de Tecnologia, Uiversidade Federal Rural do Rio de Janeiro, Seropédica, 2006.pt_BR
dc.identifier.urihttp://rima.ufrrj.br/jspui/handle/20.500.14407/26437-
dc.description.abstractAmostras de peneira molecular MCM-41 apresentando diferentes tamanhos de poros foram preparadas partindo-se de um gel com a seguinte composição molar: 1,0 SiO2: 0,12 CTABr: 0,28 TMAOH: 100 H2O. O diâmetro dos poros das amostras foi controlado variando o tempo e a temperatura de síntese. A incorporação de uma função ácida foi feita por meio de dois métodos descritos na literatura: impregnação úmida de ácido tungstenofosfórico e incorporação de zircônia sulfatada a partir de ZrOCl2.8H2O. De acordo com a análise por difração de raios X, a amostra sintetizada a 150oC por dois dias apresentou estruturas cristalinas mais ordenadas, valores mais altos da distância interplanar (d100) e foi mais estável à incorporação da função ácida. Assim sendo, esta amostra foi utilizada para os demais testes de caracterização e avaliação catalítica. Por meio da adsorção de nitrogênio foi calculada uma área especifica de 723 m2g-1 e diâmetro de poros de 46,1Å para a amostra sintetizada a 150oC por dois dias. Foi demonstrado por espectroscopia no infravermelho que, provavelmente, houve uma boa incorporação da função ácida nos poros da MCM-41. A avaliação catalítica foi realizada utilizando-se a reação de craqueamento do cumeno, para qual todas as amostras impregnadas apresentaram atividade, sendo a maior atividade apresentada pela amostra contendo 30% de ácido tungstenofosfórico.pt_BR
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado do Rio de Janeiro - FAPERJpt_BR
dc.languageporpt_BR
dc.publisherUniversidade Federal Rural do Rio de Janeiropt_BR
dc.subjectHeteropoliácidopt_BR
dc.subjectzircônia sulfatadapt_BR
dc.subjectácido tungstenofosfóricopt_BR
dc.subjectHeteropolyacidpt_BR
dc.subjectsulphated zirconiumpt_BR
dc.subjecttungstophosphoric acidpt_BR
dc.titlePeneiras moleculares MCM-41 apresentando propriedades ácidas obtidas por várias técnicaspt_BR
dc.title.alternativeMCM-41 molecular sieves exhibiting acidic properties obtained by various techniquesen
dc.typeDissertaçãopt_BR
dc.description.abstractOtherSamples of MCM-41 mesoporous molecular sieves presenting different pore sizes were prepared from a gel presenting the following molar composition: 1,0 SiO2: 0,12 CTABr: 0,28 TMAOH: 100 H2O. The samples pores diameter was controlled by changing temperature and time synthesis. An acid function was incorporated by two different methods taken from literature: the impregnation of tungstophosphoric acid and incorporation of sulphated zirconium from ZrOCl2.8H2O. According to the X-ray diffraction analysis, the sample synthesized at 150oC for two days presented more ordered crystalline structure, higher values of interplanar (d100) distance and was more stable to acid function incorporation. Based on that, this sample was choose to be catalytically evaluated. From nitrogen adsorption isotherms, a BET surface area of 723 m2g-1 and a pore size of 46,1Å were determined for the sample synthesized at 150oC for two days. It was shown by infrared spectroscopy that acid function was incorporated very efficiently into MCM-41 pores. The samples were catalytically evaluated by using cumene cracking reaction. It was observed that all functionalized samples presented activity and that the most active one was that with 30% of tungstophosphoric acid.en
dc.contributor.advisor1Fernandes, Lindoval Domiciano-
dc.contributor.advisor1IDhttps://orcid.org/0000-0002-6509-5552pt_BR
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/7921814684730923pt_BR
dc.creator.Latteshttp://lattes.cnpq.br/4348808422711055pt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentInstituto de Tecnologiapt_BR
dc.publisher.initialsUFRRJpt_BR
dc.publisher.programPrograma de Pós-Graduação em Engenharia Químicapt_BR
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