Synthesis of highly siliceous ZSM-5 zeolite using silica from rice husk ash

Kordatos, Konstantinos; Gavela, Stamatia; Ntziouni, Afroditi; Pistiolas, K.N.; Kyritsi, A.; Kasselouri-Rigopoulou, V.

doi:10.1016/j.micromeso.2007.12.032

Cited by 131 publications

(71 citation statements)

References 22 publications

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“…Several researches [22][23][24] reported that pure silica can be extracted with the purity in the range of 94-98% exists as amorphous and reactive. Many attempts have been made to utilize rice husk silica to produce various silica based materials, such as production of nanosilica [25][26] , zeolites 27 , silica aerogel 28 . In our previous investigations, several ceramic materials derived from rice husk silica reported in literatures are borosilicate 29 , carbosil 30 , aluminosilicate 31 , mullite [32][33] and cordierite [34][35] .…”

Section: Introductionmentioning

confidence: 99%

Effect of MgO-SiO2 Ratio on the Forsterite (Mg2SiO4) Precursors Characteristics Derived from Amorphous Rice Husk Silica

Sembiring¹,

Riyanto²,

Simanjuntak³

et al. 2017

Orient. J. Chem

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This study acquires the potential of rice husk silica for production forsterite precursors using sol-gel method. The samples preparation were conducted by mixing magnesium oxide sol from Mg(NO 3 ) 2 .6.12H 2 O with silica sol extracted from rice husk, with three different composition ratios of MgO to SiO 2 are 1:1, 2:3 and 3:2 by weight and sintered at 900 o C. The samples were characterized using Fourier transform infrared (FTIR) spectroscopy, x-ray diffraction (XRD),differential thermal analysis (DTA), followed by scanning electron microscopy (SEM). The FTIR results showed the presence of Si-O-Si, Mg-O and Mg-O-Si functional groups, which were associated with forsterite, enstatite, cristobalite and periclase, according to the XRD analysis. The formation of forsterite (Mg 2 SiO 4 ) is composition-dependent as revealed the increase of forsterite intensity after sintered at 900 o C in ratio 3:2. The surface morphology of non-sintered samples shows that particle and grain size were larger than particle and grain size of sintered samples. Also, SEM analysis of sintered samples clearly shows the presence of regular particle size with smaller grain size was found in ratio of MgO to SiO 2 is 3:2. DTA analysis revealed that the formation of forsterite increased with increasing temperature. In addition, the electrical resistivities of the samples were found in the range of 0.75 x 10 13 to 3.30 x 10 13 Ω-cm, demonstrating that the samples exhibit good potential as isolator.

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Section: Introductionmentioning

confidence: 99%

Effect of MgO-SiO2 Ratio on the Forsterite (Mg2SiO4) Precursors Characteristics Derived from Amorphous Rice Husk Silica

Sembiring¹,

Riyanto²,

Simanjuntak³

et al. 2017

Orient. J. Chem

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“…Alguns materiais zeolíticos tais como ZSM-5 [7,8], ZSM-48 [9], MCM-48 [10], a zeólita beta [11] e mordenita [12] sintetizados a partir de cinzas da casca de arroz foram relatados na literatura. A sua utilização na substituição de sílicas convencionalmente utilizadas em produção de zeólitas, suportes catalíticos, produção de silicatos, entre outros produtos, diminui a toxicidade do processo e aumenta a sua economia por se tratar de um material natural e de baixo custo.…”

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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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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“…Efficient utilization of the ash is a challenge for different rice-producing countries, because the rice mill generally uses husk as a fuel for its own energy generation. Many attempts have been made to utilize RHA, for example, to prepare cordierite ceramics [2,3], whiteware ceramics [4], zeolite [5,6], as a filler material in cement and rubber [7,8], etc. RHA mainly contains amorphous silica (90-98 wt%).…”

Section: Introductionmentioning

confidence: 99%

Effect of sintering temperature on phase-formation behavior and mechanical properties of silica ceramics prepared from rice husk ash

Nayak

Bera²

2009

Phase Transitions

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Silica ceramics were prepared using three types of raw materials derived from rice husk. Cleaned husk and acid-leached husk were burned at 700 C to get brown ash (BA) and white ash, respectively. The third type was silica gel (SG) derived from BA through the alkaline extraction of silica from ash followed by acid neutralization. Granulated powders were pressed and pellets were sintered at 700-1400 C range. Phase-formation behavior, densification characteristics, and mechanical strength of ceramics were investigated and correlated with microstructural features. Ceramics made of SG showed the highest density and mechanical strength among all. All the ceramics were initially amorphous and transformed into crystalline silica above a specific sintering temperature. Microstructure shows the formation of cracks in the ceramics when they contain cristobalite phases. Amorphous-to-crystalline phase transformation temperature in different types of silica source was dependent on the amount of impurity and residual hydroxyl group content.

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Synthesis of highly siliceous ZSM-5 zeolite using silica from rice husk ash

Cited by 131 publications

References 22 publications

Effect of MgO-SiO2 Ratio on the Forsterite (Mg2SiO4) Precursors Characteristics Derived from Amorphous Rice Husk Silica

Effect of MgO-SiO2 Ratio on the Forsterite (Mg2SiO4) Precursors Characteristics Derived from Amorphous Rice Husk Silica

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

Effect of sintering temperature on phase-formation behavior and mechanical properties of silica ceramics prepared from rice husk ash

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