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Previous issue date: 2009-08-12 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / Emissions of CO2 in the atmosphere have increased successively by various mechanisms caused by human action, especially as fossil fuel combustion and industrial
chemical processes. This leads to the increase in average temperature in the atmosphere, which we call global warming. The search for new technologies to minimize environmental
impacts arising from this phenomenon has been investigated. The capture of CO2 is one of the alternatives that can help reduce emis ions of greenhouse gases. The CO2 can be captured through the process of selective adsorption using adsorbents for this purpose. Were synthesized by hydrothermal method, materials of the type MCM-41 and Al-MCM-41 in the molar ratio Si / Al equal to 50. The synthesis of gels were prepared from a source of silicon, sodium, water and aluminum in the case of Al-MCM-41. The period of synthesis of the materials was 5 days in autoclave at 100?C. After that time materials were filtered, washed and dried in greenhouse at 100 ? C for 4 hours and then calcined at 450 ? C. Then the calcined material was functionalized with the Di-isopropylamine (DIPA) by the method of wet impregnation. We used 0.5 g of material mesopores to 3.5 mL of DIPA. The materials were functionalized in a closed container for 24 hours, and after this period were dried at brackground temperature for 2 hours. Were subsequently subjected to heat treatment at 250?C for 1 hour. These materials were used for the adsorption of CO2 and were characterized by
XRD, FT-IR, BET / BJH, SEM, EDX and TG / DTG. Tests of adsorption of CO2 was carried out under the following conditions: 100 mg of adsorbent, temperature of 75?C under flow of 100 mL/min of CO2 for 2 hours. The desorption of CO2 was carried out by thermogravimetry from ambient temperature to 900?C under flow of 25 mL min of He and a ratio of 10?C/min. The difratogramas X-ray for the synthesized samples showed the characteristic peaks of
MCM-41, showing that the structure of it was obtained. For samples functionalized there was a decrease of the intensities of these peaks, with a consequent reduction in the structural
ordering of the material. However, the structure was preserved mesopores. The adsorption tests showed that the functionalized MCM-41 is presented as a material promising adsorbent, for CO2 capture, with a loss of mass on the desorption CO2 of 7,52%, while that in Al-MCM-
41 functionalized showed no such loss / As emiss?es de CO2 na atmosfera v?m aumentando sucessivamente devido a v?rios mecanismos provocados pela a??o humana, principalmente como a queima de combust?veis
f?sseis e processos qu?micos industriais. Isso leva ao aumento da temperatura m?dia na atmosfera, a qual chamamos de aquecimento global. A busca por novas tecnologias para
minimizar os impactos ambientais decorrentes deste fen?meno tem sido investigadas. A captura de CO2 ? uma das alternativas que podem ajudar a diminuir as emiss?es desses gases. O CO2 pode ser capturado atrav?s do processo de adsor??o utilizando adsorventes seletivos para este fim. Foram sintetizados pelo m?todo hidrot?rmico, materiais do tipo MCM-41 e Al-
MCM-41 na raz?o molar Si/Al igual a 50. Os g?is de s?nteses foram preparados partindo deuma fonte de sil?cio, s?dio, ?gua destilada e alum?nio no caso do Al-MCM-41. O per?odo de
s?ntese dos materiais foi de 5 dias em autoclave a 100?C. Ap?s esse tempo os materiais foram filtrados, lavados e secos em estufa a 100?C durante 4 horas, e posteriormente calcinados a 450?C. Em seguida os materiais calcinados foram funcionalizados com a Di-iso-propilamina (DIPA) atrav?s do m?todo de impregna??o por via ?mida. Foi utilizado 0,5 g de material mesoporoso para 3 mL de DIPA. Os materiais funcionalizados ficaram em um recipiente fechado durante 24 horas, e ap?s esse per?odo foram secos em temperatura ambiente durante 2 horas. Posteriormente foram submetidos a um tratamento t?rmico a 250?C durante 1 hora. Estes materiais foram utilizados para o processo de adsor??o de CO2 e foram caracterizados por DRX, FT-IR, BET/BJH, MEV, EDX e TG/DTG. Os ensaios de adsor??o de CO2 foram
realizados nas seguintes condi??es: 100 mg de adsorvente, temperatura de 75?C sob fluxo de 100 mL/min de CO2 durante 2 horas. A dessor??o do CO2 foi realizada atrav?s da
termogravimetria, da temperatura ambiente at? 900?C, sob fluxo de 25 mL/min de He e uma raz?o de 10?C/min. Os difratogramas de raios-X para as amostras sintetizadas apresentaram os picos caracter?sticos do MCM-41, evidenciando que a estrutura do mesmo foi obtida. Para as
amostras funcionalizadas observou-se uma diminui??o das intensidades desses picos, consequentemente, uma diminui??o do ordenamento estrutural do material. No entanto, a estrutura mesoporosa foi preservada. Os testes de adsor??o mostraram que o MCM-41 funcionalizado se apresentou como um material adsorvente promissor, para captura de CO2, com uma perda de massa referente ? dessor??o do CO2 de 7,52 %, enquanto que no Al-MCM-
41 funcionalizado n?o apresentou essa perda
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/17608 |
| Date | 12 August 2009 |
| Creators | Barbosa, Marcela Nascimento |
| Contributors | CPF:35530502415, http://lattes.cnpq.br/9770622597949866, Fernandes J?nior, Valter Jos?, CPF:42314070453, http://lattes.cnpq.br/1595902438130772, Barros Filho, Allan Kardec Dualibe, CPF:34022589353, Pedrosa, Anne Michelle Garrido, Ara?jo, Ant?nio Souza de |
| 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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