Made available in DSpace on 2014-12-17T14:08:54Z (GMT). No. of bitstreams: 1
DanielleLM_DISSERT.pdf: 1223674 bytes, checksum: 2d564bea614284da929e26c705739bfb (MD5)
Previous issue date: 2013-06-24 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The production of synthesis gas has received renewed attention due to demand for renewable
energies to reduce the emissions of gases responsible for enhanced greenhouse effect. This
work was carried out in order to synthesize, characterize and evaluate the implementation of
nickel catalysts on MCM-41 in dry reforming reactions of methane. The mesoporous
molecular sieves were synthesized using as silica sources the tetraethyl orthosilicate (TEOS)
and residual glass powder (PV). The sieves were impregnated with 10% nickel to obtain the
metallic catalysts (Ni/MCM-41). These materials were calcined and characterized by
Thermogravimetric Analysis (TG), Infrared spectroscopy (FTIR), X-ray Diffraction (XRD),
Temperature-Programmed Reduction (TPR) and N2 Adsorption/Desorption isotherms
(BET/BJH). The catalytic properties of the samples were evaluated in methane dry reforming
with CO2 in order to produce synthesis gas to be used in the petrochemical industry. The
materials characterized showed hexagonal structure characteristic of mesoporous material
MCM-41 type, being maintained after impregnation with nickel. The samples presented
variations in the specific surface area, average volume and diameter of pores based on the
type of interaction between the nickel and the mesoporous support. The result of the the
catalytic tests showed conversions about 91% CO2, 86% CH4, yelds about 85% CO and 81%
H2 to Ni/MCM-41_TEOS_C, and conversions about 87% CO2, 82% CH4, yelds about 70%
CO and 59% H2 to Ni/MCM-41_PV_C. The similar performance confirms that the TEOS can
be replaced by a less noble materials / A produ??o de g?s de s?ntese tem recebido muita import?ncia devido a procura por fontes de
energias renov?veis para reduzir as emiss?es dos gases respons?veis pelo aumento do efeito
estufa. Este trabalho foi realizado com o objetivo de sintetizar, caracterizar e avaliar a
aplica??o dos catalisadores de n?quel sobre MCM-41, em rea?oes de reforma a seco de
metano. As peneiras moleculares mesoporosas foram sintetizadas utilizando como fontes de
s?lica o Tetraetil Ortosilicato (TEOS) e o res?duo de p? de vidro (PV). As peneiras foram
impregnadas com 10% de n?quel para forma??o dos catalisadores met?licos (Ni/MCM-41).
Esses materiais foram calcinados e caracterizados por Termogravimetria (TG),
Espectroscopia na Regi?o do Infravermelho (FTIR), Difratometria de raios X (DRX),
Redu??o de Temperatura Programada (TPR) e Adsor??o e Dessor??o de N2 (BET/BJH). As
propriedades catal?ticas das amostras foram avaliadas na reforma a seco de metano com CO2,
tendo como objetivo a produ??o de g?s de s?ntese para utiliza??o na ind?stria petroqu?mica.
Os materiais caracterizados apresentaram estrutura hexagonal caracter?stica do material
mesoporoso tipo MCM-41, sendo mantida ap?s a impregna??o com n?quel. As amostras
apresentaram varia??es quanto ? ?rea superficial espec?fica e volume m?dio de poros, em
fun??o do tipo de intera??o existente entre o n?quel e o suporte mesoporoso. Os resultados dos
testes catal?ticos mostraram convers?es de 86% de CH4 e 91% de CO2 e rendimento de 85%
de CO e 81% de H2 para o material Ni/MCM-41_TEOS_C, e convers?es de 82% de CH4 e
87% de CO2 e rendimentos na produ??o do g?s de s?ntese de 70% de CO e 59% de H2 para o
material Ni/MCM-41_PV. Esse comportamento semelhante comprova que o TEOS pode ser
substitu?do por um material menos nobre
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12986 |
| Date | 24 June 2013 |
| Creators | Montenegro, Danielle Lobo |
| Contributors | CPF:06117988320, http://lattes.cnpq.br/3318871716111536, Silva, Djalma Ribeiro da, CPF:13893734449, http://lattes.cnpq.br/2791074318745945, Melo, Marcus Ant?nio de Freitas, CPF:04514998320, http://lattes.cnpq.br/5840621182000517, Qunitella, Solange Assun??o, CPF:32128088372, http://lattes.cnpq.br/7521511093074177, Melo, Dulce Maria de Ara?jo |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncia e Engenharia do Petr?leo, UFRN, BR, Pesquisa e Desenvolvimento em Ci?ncia e Engenharia de Petr?leo |
| 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 |
Page generated in 0.0017 seconds