Synthesis of ZSM-5 zeolite and silicalite from rice husk ash

Panpa, Withaya; Jinawath, Supatra

doi:10.1016/j.apcatb.2009.03.029

Cited by 99 publications

(57 citation statements)

References 9 publications

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“…Panpa and Jinawath (2009) reported that the initial system with SiO 2 /Al 2 O 3 molar ratios less than 80 produced an amorphous phase of poorly crystalline ZSM-5 zeolite using rice husk ash as silica source and sodium aluminate as alumina source. They found that the gels with SiO 2 /Al 2 O 3 molar ratios ranging from 80 to 200 favored crystalline ZSM-5 zeolite production.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of nanosized ZSM-5 zeolite using extracted silica from rice husk without adding any alumina source

2014

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The synthesis of analcime and nanosized ZSM-5 zeolites was carried out by a hydrothermal method with silica extracted from rice husk, available as an inexpensive local biowaste, and without the use of an extra alumina source. Amorphous silica (with 88 wt% of SiO 2 ) was extracted from rice husk ash by a suitable alkali solution. The effects of crystallization temperature, time and SiO 2 / Al 2 O 3 ratio of the initial system on the properties of final products were investigated. For the characterization of the synthesized product, X-ray diffraction, scanning electron microscope, energy dispersive X-ray techniques, Fourier transform infrared and Brunauer-Emmett-Teller method were applied. Crystallinity percentages of analcime and nanosized ZSM-5 were 95.86 and 89.56, respectively, with specific surface area of 353.5 m 2 g -1 for ZSM-5. The experimental results revealed that the synthesis of analcime and nanosized ZSM-5 zeolites was more practical with using silica extracted from inexpensive raw materials, while the whole crystallization process was accomplished without adding any alumina source during.

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Section: Resultsmentioning

confidence: 99%

Synthesis of nanosized ZSM-5 zeolite using extracted silica from rice husk without adding any alumina source

2014

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“…Outras zeólitas como a ZSM-5 já foram sintetizadas a partir de cinzas de casca de arroz [12][13][14][15][16] e de argilas [17]. A escolha do tipo de zeólita a ser sintetizada a partir de um resíduo, está relacionada diretamente com a sua composição.…”

Section: +unclassified

Síntese de zeólitas utilizando resíduo sílico-aluminoso proveniente do processo de extração de lítio

et al. 2013

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ResumoUtilizou-se um resíduo sílico-aluminoso como fonte de SiO 2 e Al 2 O 3 para síntese de zeólitas. O resíduo é um subproduto do processo de extração de lítio do ß-espodumênio. Os produtos sintetizados caracterizaram-se por uma mistura de fases zeolíticas e compostos presentes no resíduo, que não foram solubilizados. Quando a relação Si/ Al foi ajustada para 1, foi formada uma mistura de fases zeólita A + sodalita e zeólita NaP + sodalita. A mistura de fases zeólita A + sodalita foi obtida deixando o resíduo sílico-aluminoso em agitação por 2 h a 80 o C, antes da adição de aluminato de sódio e posterior cristalização por 4 h. Quando a mistura resíduo e NaOH ficou em estático a 100 o C por 4 h, nesta mesma etapa, o produto formado foi uma mistura de sodalita + zeólita NaP. O aumento da razão Si/Al para 3,2, uma etapa de envelhecimento e maiores tempos de cristalização, levou a formação de uma mistura de fases NaP1 e quartzo pertencente ao resíduo. Palavras-chave: resíduo sílico-aluminoso, zeólita A, sodalita, zeolita NaP, NaP1. Abstract In this study we used a silico-aluminous residue as a source of SiO

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“…Hence, looking for new applications of husk is fundamental. Recently, rice husk has been studied as precursor for preparation of active carbon [1,2], silica [1,3], zeolite [4,5], concrete [6], etc. With such advantages like porous structure, high surface area and low cost, porous carbon has attracted considerable attention and has been widely studied as catalyst carriers, adsorb materials or as electrode materials for batteries and capacitors [7 -9].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Porous Carbon From Rice Husk Applied for Electrode Materials

Huyền¹

2018

JST

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Rice husk (RH) was used as the precursor for porous carbon preparation applying as electrode materials. Porous carbon was synthesized by pyrolysis of RH under inert gas atmosphere followed by hydrothermal treatment in NaOH to remove the silica fraction and K 2 CO 3 activation to increase porosity of archived carbon. The temperature of RH decomposition was determined by the thermal gravimetric analysis (TGA) method in the nitrogen atmosphere. The performance of porous carbon and C-SiO x were examined using Brunauer-Emmett-Teller (BET) measurement and Scanning electron microscopy (SEM). The electrochemical characterizations of the synthesized materials were analyzed using cyclic voltammetry (CV) and chronopotentiometry techniques. The effect of parameters of hydrothermal and activation steps on the capacity of these porous carbons were researched. The activated porous carbon which obtained by K 2 CO 3 activation at 900 0 C in 2 hours has high specific surface area (S BET = 769.3 m 2 /g). Specific capacitance of the as-prepare electrode is 116.2 F.g -1 at scan rate of 5 mV/s. Therefore, as-prepared porous carbon from RH would be proper candidate for application as electrode material.

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Synthesis of ZSM-5 zeolite and silicalite from rice husk ash

Cited by 99 publications

References 9 publications

Synthesis of nanosized ZSM-5 zeolite using extracted silica from rice husk without adding any alumina source

Synthesis of nanosized ZSM-5 zeolite using extracted silica from rice husk without adding any alumina source

Síntese de zeólitas utilizando resíduo sílico-aluminoso proveniente do processo de extração de lítio

Preparation and Characterization of Porous Carbon From Rice Husk Applied for Electrode Materials

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