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Previous issue date: 2012-07-20 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The oxidative desulfurization process (ODS) of a commercial diesel fuel was performed
under mild conditions in the presence of catalysts based on vanadium or manganese,
supported on alumina, clays (commercial, natural and pillared) and zeolites (NaX, NaY, beta,
mordenite and ZSM-5). The catalysts were synthesized by wet impregnation and
characterized by X-ray diffraction, textural analysis by N2 adsorption and scanning electron
microscopy. The dibenzothiophene (DBT) was used as sulfur compound in catalytic
evaluation. The reactions were performed using acetonitrile as solvent and the hydrogen
peroxide as oxidant at 55?C. The reaction products were analized by gas chromatography
(GC-FID). In the studied conditions, the process was efficient due to the DBT was converted
to its corresponding sulfone. Both DBT and corresponding sulfone were extracted by the
solvent. Removals and oxidations up to 100% of sulfur compound were achieved. The
catalysts supported on ZSM-5 zeolite showed are more effective for oxidation reaction of
sulfur compound, presenting the best results. It was observed for oxidation reaction, that
vanadium catalysts were more effective and manganese catalysts showed best results for
removal of sulfur compounds / O processo de Dessulfuriza??o Oxidativa (ODS) de um diesel comercial foi realizado em
condi??es suaves na presen?a de catalisadores ? base de van?dio ou mangan?s, suportados em
aluminas, argilas (comerciais, naturais e pilarizadas) e ze?litas (NaX, NaY, beta, mordenita,
ZSM-5). Os catalisadores foram sintetizados via impregna??o ?mida e caracterizados por
difra??o de raios-X, an?lise textural por adsor??o e dessor??o de nitrog?nio e microscopia
eletr?nica de varredura. O dibenzotiofeno (DBT) foi utilizado como o composto de enxofre
nos testes catal?ticos. As rea??es foram realizadas usando como solvente acetonitrila e como
oxidante o per?xido de hidrog?nio a temperatura de 55?C. Os produtos de rea??o foram
analisados por cromatografia gasosa (CG-FID). Nas condi??es estudadas o processo mostrouse
eficiente, o DBT foi convertido para sua respectiva sulfona. Ambos DBT e a sulfona foram
extra?dos pelo solvente. Remo??es e oxida??es de 100% do composto de enxofre foram
alcan?adas. Os catalisadores suportados na ze?lita ZSM-5 mostraram-se mais efetivos para a
rea??o de oxida??o do composto sulfurado, apresentando os melhores resultados. Observa-se
para a rea??o de oxida??o que os catalisadores de van?dio foram mais efetivos, e os
catalisadores de mangan?s apresentaram melhores resultados na extra??o dos compostos
sulfurados
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/17671 |
| Date | 20 July 2012 |
| Creators | Mello, Mariele Iara Soares de |
| Contributors | CPF:50942611004, http://lattes.cnpq.br/5249001430287414, Vitor Sobrinho, Eledir, CPF:64656969915, http://lattes.cnpq.br/8488499388852606, Ara?jo, Ant?nio Souza de, CPF:35530502415, http://lattes.cnpq.br/9770622597949866, Silva, Ademir Oliveira da, CPF:16225422404, http://lattes.cnpq.br/3511004608337461, Oliveira, Luiz Carlos Alves de, CPF:82248010630, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4795801A1, Pergher, Sibele Berenice Castella |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Qu?mica, UFRN, BR, F?sico-Qu?mica; Qu?mica |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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