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Síntese de materiais mesoporosos: um estudo comparativo entre o SBA-15 e o KIT-6

Synthesis of mesoporous materials: A comparative study of the SBA-15 and KIT-6

FERNANDES, Fernando Rodrigo Dantas; SANTOS, Anne Gabriella Dias; CALDEIRA, Vinícius Patrício da Silva; SOUZA, Luiz Di;

Completo:

Materiais mesoporos ordenados têm recebido muita atenção devido às suas potenciais aplicações em catálise, adsorção, troca iônica e fabricação de materiais funcionais avançados. Dentre os materiais mesoporosos o SBA-15 e o KIT- 6, que possuem estruturas hexagonal e cúbica, respectivamente, possuem características interessantes, tais como: alta estabilidade térmica e hidrotérmica, sistemas de poros bastante ordenados, área superficial elevada e elevados diâmetro e volume médio de poros. A síntese desses materiais ocorre de forma hidrotérmica em meio ácido, utilizando o P123 como direcionador de estrutura e o TEOS como fonte de sílica, e na síntese do KIT-6, diferente do SBA-15, ocorre também a adição do Butanol como co-solvente e co-direcionador. O objetivo do presente trabalho é sintetizar e caracterizar os materiais mesoporosos SBA-15 e KIT-6 a fim de se realizar um estudo comparativo entre os materiais, avaliando aspectos estruturais e morfológicos dos mesmos. Os materiais foram sintetizados segundo procedimentos encontrados na literatura e caracterizados através das técnicas de DRX, TG/DTG, Adsorção/Dessorção de N2 e MEV. Os materiais foram obtidos com êxito, apresentando características típicas. Pôde ser observado através das caracterizações as principais diferenças estruturais e morfológicas existentes entre os dois tipos de materiais. O SBA-15 apresenta uma estrutura hexagonal mais fácil de se formar em comparação com a estrutura cúbica do KIT-6. Necessita-se da adição do Butanol na parte inicial da síntese do KIT-6, para que as micelas a se organizem das micelas na forma cúbica.

Completo:

Ordered mesoporous materials have received much attention due to their potential applications in catalysis, adsorption, ion exchange and manufacture of advanced functional materials. Among the mesoporous materials SBA-15 and KIT 6, which have hexagonal and cubic structures respectively, have interesting characteristics such as high thermal and hydrothermal stability, well ordered pore systems, high surface area and high volume and diameter Average pore. The synthesis of these materials hydrothermal occurs in acidic medium, using P123 as structure director and TEOS as silica source, and the synthesis of KIT-6, different from SBA-15, also occurs the addition of butanol as a co- solvent and co-driver. The objective of this study is to synthesize and characterize the mesoporous materials SBA-15 and KIT-6 in order to carry out a comparative study of the materials, assessing structural and morphological aspects of them. The materials were prepared by procedures found in the literature and characterized by means of XRD techniques, TG / DTG, adsorption / desorption of N2 and SEM. The materials were successfully synthesized, having typical characteristics. It might be observed by characterization of the main structural and morphological differences between the two types of materials. The SBA-15 has a hexagonal structure easier to form compared to KIT-6 cubic structure. Need to the addition of the butanol in the initial part of the KIT-6 synthesis, for the organization of the micelles in the cubic form.

Palavras-chave: Síntese; Caracterização; SBA-15; KIT-6,

Palavras-chave: Synthesis; Characterization; SBA-15; KIT-6.,

DOI: 10.5151/chenpro-5erq-in6

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Como citar:

FERNANDES, Fernando Rodrigo Dantas; SANTOS, Anne Gabriella Dias; CALDEIRA, Vinícius Patrício da Silva; SOUZA, Luiz Di; "Síntese de materiais mesoporosos: um estudo comparativo entre o SBA-15 e o KIT-6", p. 439-448 . In: Anais do V Encontro Regional de Química & IV Encontro Nacional de Química [=Blucher Chemistry Proceedings].. São Paulo: Blucher, 2015.
ISSN 2318-4043, DOI 10.5151/chenpro-5erq-in6

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