Effect of temperature on nano-crystalline silica and carbon composites obtained from rice-husk ash

Sarangi, Madhumita; Nayak, P.; Tiwari, Tuhina

doi:10.1016/j.compositesb.2011.05.026

Cited by 73 publications

(39 citation statements)

References 11 publications

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“…In comparison with RHB-MH prepared under the same conditions using HMDA (Fig. 3b), the size of MNPs formed on are much smaller, nearly monodispersed with a diameter of about 30 nm which agrees well with that observed by previous investigators [11][12][13]. Evidently, HMDA plays the key role in reducing the size of MNPs during its growth in the solvothermal reaction.…”

Section: Resultssupporting

confidence: 79%

“…Briefly, anhydrous sodium acetate (1.6 g) and FeCl3.6H2O (0.8 g) were dissolved in ethylene glycol (24 mL) with vigorous stirring at 50 o C in the presence of 0.5 g of RHF. Surface aminefunctionalized MNPs were synthesized adapting to the procedure used by Wang et al, 2006 [11]. When 1,6-hexanediamine (HMDA) (7 mL) was added, the solution turned into dark-orange, then solvothermal was conducted at 200 o C for 6 h.…”

Section: Preparation Of Rice Husk Fiber With Magnetic Nanoparticles Bmentioning

confidence: 99%

See 1 more Smart Citation

Rice Husk Fiber Magnetic Nanoparticle Biocomposites: Preparation and Characterization

Nata

Putra

Nurandini

et al. 2018

IOP Conf. Ser.: Earth Environ. Sci.

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Section: Resultssupporting

confidence: 79%

Section: Preparation Of Rice Husk Fiber With Magnetic Nanoparticles Bmentioning

confidence: 99%

Rice Husk Fiber Magnetic Nanoparticle Biocomposites: Preparation and Characterization

Nata

Putra

Nurandini

et al. 2018

IOP Conf. Ser.: Earth Environ. Sci.

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“…The crystallinity and morphology of used Mn 10 Co 15 /N and Mn 10 Co 15 /F were also investigated to determine if the application of high temperatures during the oxidation tests affected the structure of the spent catalysts [42]. Better resolved diffraction peaks were clearly observed during the XRD analysis of the spent samples ( Figure 10) compared to those reported in Figure 1.…”

Section: Characterization Of the Used Catalystmentioning

confidence: 75%

“…The high-temperature treatment increases the crystallinity of silicate in food-grade diatomite due to the sintering of smaller crystals [42], producing the well-defined diffraction peaks shown in Figure 1a.…”

Section: Xrd Characterizationmentioning

confidence: 99%

A Comparative Study of Mn/Co Binary Metal Catalysts Supported on Two Commercial Diatomaceous Earths for Oxidation of Benzene

Tomatis

Wei

et al. 2018

Catalysts

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Two commercial diatomaceous earths were used as supports for the preparation of Mn/Co binary metal catalysts at different metal loads (5 to 10 wt % Mn and 5 to 15 wt % Co) by incipient wetness deposition. The activity of the prepared catalysts towards the complete oxidation of benzene to CO 2 and water was investigated between 100 and 400 • C. Raw supports and synthesized catalysts were characterized by XRD, N 2 physisorption, SEM-EDS, H 2 -TPR, and TPD. The purification treatment of food-grade diatomite significantly affected the crystallinity of this support while reducing its specific surface area (SSA). A loss of SSA, associated with the increase in the metal load, was observed on samples prepared on natural diatomite, while the opposite trend occurred with food-grade diatomite-supported catalysts. Metal nanoparticles of around 50 nm diameter were observed on the catalysts' surface by SEM analysis. EDS analysis confirmed the uniform deposition of the active phases on the support's surface. A larger H 2 consumption was found by TPR analysis of natural diatomite-based samples in comparison to those prepared at the same metal load on food-grade diatomite. During the catalytic oxidation experiment, over 90% conversion of benzene were achieved at a reaction temperature of 225 • C by all of the prepared samples. In addition, the formation of coke during the oxidation tests was demonstrated by TGA analysis and the soluble fraction of the produced coke was characterized by GC-MS.

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“…A queima da casca de arroz produz cinzas com teor de sílica entre 85 e 98% (DEY et al, 2013;SARANGI et al, 2011). Quando a queima é realizada de forma controlada, é possível a obtenção de sílica altamente reativa (JAMES e RAO, 1986).…”

Section: Introductionunclassified

Cinzas De Casca De Arroz Como Fonte Alternativa De Silício Para a Síntese De Zeólita Beta

Enzweiler

Barbosa-Coutinho

Schwaab

2014

REGET

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ResumoCinzas de casca de arroz são resíduos agroindustriais gerados em larga escala que podem acarretar problemas ambientais e riscos à saúde da população. Como solução para este problema, as cinzas podem ser utilizadas como fonte alternativa de sílica altamente reativa, com vasto campo de aplicação, como, por exemplo, na síntese de catalisadores de alto teor de silício, como as zeólitas. Neste trabalho, zeólita beta foi sintetizada usando sílica amorfa, extraída de cinzas de casca de arroz, e pseudoboemita. Utilizando esta fonte alternativa de silício foi possível a formação da estrutura zeolítica com excelentes propriedades catalíticas. A aplicação da zeólita beta na desidratação do isopropanol possibilitou a produção de propeno com alta seletividade a baixas temperaturas, mostrando que a utilização de sílica proveniente de cinzas de cascas de arroz tem grande potencial tecnológico e ambiental.Palavras-chave: Zeólita beta; catalisador; cinzas de casca de arroz; isopropanol; propeno. AbstractRice husk ash is an agroindustrial residue generated in large scale that can cause environmental problems and risks to people health. As a solution to this problem, this ash could be used as an alternative source of high reactive silica, with a wide field of applications, such as, for example, in the synthesis of catalysts with high silicon content. In this work, beta zeolite was synthesized using amorphous silica, extracted from rice husk ash, and pseudo-boehmite. Using this alternative source of silicon, it was possible to form the zeolitic structure with excellent catalytic properties. The application of the beta zeolite in the dehydration of isopropanol enables the production of propylene with high selectivity at low temperatures, showing that the use of silica from rice husk ash has a great technological and environmental potential.

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Effect of temperature on nano-crystalline silica and carbon composites obtained from rice-husk ash

Cited by 73 publications

References 11 publications

Rice Husk Fiber Magnetic Nanoparticle Biocomposites: Preparation and Characterization

Rice Husk Fiber Magnetic Nanoparticle Biocomposites: Preparation and Characterization

A Comparative Study of Mn/Co Binary Metal Catalysts Supported on Two Commercial Diatomaceous Earths for Oxidation of Benzene

Cinzas De Casca De Arroz Como Fonte Alternativa De Silício Para a Síntese De Zeólita Beta

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