Synthesis of MCM-41 from coal fly ash by a green approach: Influence of synthesis pH

Hui, Kai Lung; Chao, Christopher Yu Hang

doi:10.1016/j.jhazmat.2006.03.050

Cited by 133 publications

(67 citation statements)

References 71 publications

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“…Porém, um inconveniente desses precursores de silício é o elevado custo, que resulta em maior custo de produção do material. -1 e espessura de parede de 1,0 nm [5]. O quartzo e o rejeito de diatomita foram utilizados por Silva (2009) como fonte de sílica e alumínio, respectivamente, na síntese de peneiras moleculares mesoporosas do tipo MCM-41 e AlMCM-41.…”

Section: Introductionunclassified

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Síntese Da Peneira Molecular McM-41 Derivada Da Cinza Da Casca Do Arroz

Braga

Teodoro

Melo

et al. 2013

HOLOS

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Artigo submetido em abril de 2013 e aceito em outubro de 2013 RESUMOAs peneiras moleculares MCM-41 têm atraído grande interesse devido as suas propriedades de alta área específica, volume e diâmetro de poros controláveis. Estes materiais são aplicados em diversos ramos da indústria química como adsorventes, suportes catalíticos e catalisadores heterogêneos em vários processos. , com dimensões e volume de poros dentro das especificações de materiais mesoporosos, sendo estas prorpriedades semelhantes ao MCM-41 sintetizado com a sílica gel comercial, comprovando que a cinza da casca do arroz pode ser utilizada como fonte alternativa de sílica na síntese de peneiras moleculares do tipo MCM-41. PALAVRAS-CHAVE:MCM-41, síntese hidrotérmica, sílica, cinza da casca do arroz SYNTHESIS OF MCM-41 MOLECULAR SIEVE DERIVED FROM RICE HUSK ASH ABSTRACTMCM-41 molecular sieves attracted great interest due their properties, as high specific surface area, controllable diameter and pore volume. These materials have been applied as adsorbents, catalyst supports, and heterogeneous catalysts in various branches of the chemical industry. In this work, MCM-41 was synthesized from rice husk ash, natural and chemically treated, as alternative sources of silica, called CCA-MCM-41 and CCAL-MCM-41, respectively, with the aim of reusing this residue and produce a lower cost mesoporous material. The materials were synthesized by the hydrothermal method from a gel composition: CTAMBr 1,0 mol L -1 ; SiO 2 4,0 mol L -1 ; Na 2 O 1,0 mol L -1 ; H 2 O 200 mol L -1 ; and characterized by XRF, XRD, FT-IR and specific surface area determination by the BET method. The materials showed high specific surface area (905 m 2 g -1 ), with dimensions and pore volume within the specifications of mesoporous materials, which are proprieties similar to MCM-41 synthesized with commercial silica gel, proving that rice husk ash can be used as an alternative source of silica for the synthesis of MCM-41 molecular sieves.

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Section: Introductionunclassified

“…Muitos autores têm sugerido que o tratamento ácido antes do tratamento térmico é um método adequado para extração natural da sílica [5,13,14,15]. Sílicas de alta pureza e baixo percentual de traços minerais foram recuperadas pela fervura de solução clorídica por 1 hora, seguida de aquecimento à 650-700 o C por 4 horas [13].…”

Section: Introductionunclassified

Síntese Da Peneira Molecular McM-41 Derivada Da Cinza Da Casca Do Arroz

Braga

Teodoro

Melo

et al. 2013

HOLOS

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“…The maximum of surfactant removal for F-MCM-41(3) was also different from that for other samples (considerably higher). According to Hui and Chao [5], TGA investigations of the Al-MCM-41 materials suggested a much stronger interaction of the organic template cations with Al species than with SiO -(this explains the fact that the peaks of surfactant removal for the Al-MCM-41 samples are shifted towards higher temperatures compared to the silicon samples). Perhaps, the farther a peak is shifted, the more the Al species are incorporated into the sample (in this study, the largest shift of the peak was found for the MCM-41(3) sample).…”

Section: Thermal Analysismentioning

confidence: 97%

“…This fact encouraged searches for new possibilities of using FA as a source of silicon and aluminium. The synthesis of FA-based mesoporous materials, the information of which can be found in references [3][4][5][6][7][8], has turned out to be one of those possibilities. Although porous solid bodies (containing micro-, meso-and macropores) are a group of materials being widely used in catalytic, purification and separation processes for a long time, the synthesis of materials containing mesopores of uniform size fructified into a success only in 1992, when scientists of the Mobil Company discovered a family of materials designated with the symbol M41S [9].…”

Section: Introductionmentioning

confidence: 99%

“…On the basis of studies available in the literature [3][4][5][6][7][8], the Si/Al ratio and Si contents in the FA filtrate can be ranked amongst the main factors influencing the synthesis of mesoporous materials from FA. It is known, that this ratio depends not only on the method of recovery of Si and Al from the solution, but in particular also on the chemical and mineralogical composition of FA, from which it is obtained.…”

Section: Introductionmentioning

confidence: 99%

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Thermogravimetry applied to characterization of fly ash-based MCM-41 mesoporous materials

Majchrzak‐Kucęba

2011

J Therm Anal Calorim

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The thermogravimetry (TG) was used for characterization of the fly ash (FA)-based MCM-41 mesoporous materials. MCM-41 mesoporous materials were synthesized using silica extracts from different FA. The synthesis of MCM-41 from FA was carried out by the hydrothermal method using the supernatants of coal FA (in the form of sodium silicate) and cationic cetyltrimethylammonium bromide (CTAB) surfactants as the structuredirecting agents. On the basis of the data obtained from the TG analysis, thermal behaviour of FA-based MCM-41 mesoporous materials was assessed. This study has established the range of temperatures corresponding to the desorption of water, decomposition of the surfactant and condensation of silanol, thereby making the overall quality assessment of FA-based MCM-41 mesoporous materials.

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Green Applied Solutions: Customized Waste Valorization Solutions for a Sustainable Future

Luque²

2016

Industrial Biorenewables

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Synthesis of MCM-41 from coal fly ash by a green approach: Influence of synthesis pH

Cited by 133 publications

References 71 publications

Síntese Da Peneira Molecular McM-41 Derivada Da Cinza Da Casca Do Arroz

Síntese Da Peneira Molecular McM-41 Derivada Da Cinza Da Casca Do Arroz

Thermogravimetry applied to characterization of fly ash-based MCM-41 mesoporous materials

Green Applied Solutions: Customized Waste Valorization Solutions for a Sustainable Future

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