Effect of cobalt catalyst on the formation of SiC from rice husk silica-carbon black mixture

Krishnarao, R. V.

doi:10.1007/bf00351879

Cited by 18 publications

(11 citation statements)

References 23 publications

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“…The latter might also catalyse SiC formation, as the same has already been demonstrated for sodium silicate (Na 2 SiO 3 ), which reduced the SiC temperature formation by 300 K [35]. Furthermore, K 2 CO 3 -impregnated RS was placed inside of a nickel crucible for activation and Ni, similarly to Fe and Co, is known to catalyse SiC formation [33,36,37]. Therefore, SiC was probably produced through catalytic reactions due to the initial RS mineral content, to K 2 SiO 3 formed during the process, and to nickel used as container.…”

Section: Chemical and Textural Characterisationmentioning

confidence: 70%

Rice straw-based activated carbons doped with SiC for enhanced hydrogen adsorption

Schaefer

Muniz

Izquierdo

et al. 2017

International Journal of Hydrogen Energy

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Activated carbons (ACs) based on rice straw (RS) were synthesised using potassium carbonate as activating agent at three different K 2 CO 3 /RS weight ratios. Morphological, chemical, structural as well as textural characterisations were carried out in order to establish relationships between the physicochemical properties of the materials and their hydrogen adsorption capacities. The ACs contained potassium and silicon as the main impurities. Si was identified by XRD in both phases of silicon dioxide and silicon carbide. The presence of SiC was particularly surprising due to the rather low activation temperature, much lower than what is usually required for SiC synthesis. ACs exhibited well-developed surface areas (approximatively 2000e2100 m 2 g À1) and high micropore volumes, making them suitable for hydrogen storage applications. RS-based ACs showed higher hydrogen storage capacities than those previously obtained with KOH-activated sucrose. The latter exhibited hydrogen uptakes (excess, 10 MPa, 298 K) up to 0.55 wt. %, whereas 0.65 wt. % was measured for RSbased ACs in the same conditions. The higher hydrogen capacities and isosteric heats of adsorption found here were attributed to the presence of SiC.

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Section: Chemical and Textural Characterisationmentioning

confidence: 70%

Rice straw-based activated carbons doped with SiC for enhanced hydrogen adsorption

Schaefer

Muniz

Izquierdo

et al. 2017

International Journal of Hydrogen Energy

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“…The increasing order of catalytic activity is Ni > Co > Fe > un-catalyzed, whereas for SiC crystal size is Co > Fe > Ni > un-catalyzed.In the investigation by Krishnaro [210] cobalt has been found to accelerate the formation of total SiC (particulate and whiskers) and decreasethe formation of SiC whiskers from mixture of silica-carbon black. Cobalt acts as a strong catalyst to the gasification of carbon and decreases the crystallization of carbon black.…”

Section: Effects Of Catalystsmentioning

confidence: 97%

Review on the physicochemical treatments of rice husk for production of advanced materials

Soltani

Bahrami

Pech-Canul

et al. 2015

Chemical Engineering Journal

507

231

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“…Recently, microwave heating is utilized to fabricate SiC [102][103][104]. Different catalyst activities for the formation of SiC have also been investigated in several studies [105]. Some metallic catalysts (Fe, Ni, Cr, Co and Pd) greatly influence the reaction rate between C and SiO 2 in the temperature range of 1200-1600°C, which is attributed to the high production rate with a desirable particle morphology.…”

Section: Silicon Carbidementioning

confidence: 99%

Rice husk/rice husk ash as an alternative source of silica in ceramics: A review

Hossain

Mathur

Roy

2018

Journal of Asian Ceramic Societies

270

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Use of waste or by-products from different industries and the agricultural sector has received increasing attention in the scientific, technology, ecological, economic and social spheres in recent years. Rice husk (RH) is a by-product of rice milling and rice husk ash (RHA) is generated by combustion in a separate boiler. Both RH and RHA are abundantly accessible in rice growing countries such as China, India, Brazil, the USA, and Southeast Asia. RH has therefore been recycled by burning it for energy production. This generates RHA, which contains a huge quantity (85-95%) of amorphous silica. Over the past two decades, RHA has been used extensively in numerous fields for manufacturing of different silicates, zeolites, catalysts, nanocomposite, cement, lightweight construction materials, insulators, and adsorbents. This paper presents a comprehensive overview on the processing of nano-silica from RH/RHA. It tries at the same time, to present a critical review of the application of RHA as an ingredient for the production of various ceramic materials, e.g. refractory, glass, whiteware, oxide and non-oxide ceramics, silica aerogel and SiO 2 /C composites. In summary, amorphous silica derived from RHA or RH provides a potential alternative to conventional silica sources (e.g. quartz) for the manufacture of value-added ceramics for practical applications.

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Effect of cobalt catalyst on the formation of SiC from rice husk silica-carbon black mixture

Cited by 18 publications

References 23 publications

Rice straw-based activated carbons doped with SiC for enhanced hydrogen adsorption

Rice straw-based activated carbons doped with SiC for enhanced hydrogen adsorption

Review on the physicochemical treatments of rice husk for production of advanced materials

Rice husk/rice husk ash as an alternative source of silica in ceramics: A review

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