• Bulletin of the Korean Chemical Society
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• v.32 no.5
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• pp.1773-1776
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• 2011

• Journal of the Korean Ceramic Society
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• v.36 no.6
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• pp.590-598
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• 1999

• Bulletin of the Korean Chemical Society
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• v.29 no.7
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• pp.1418-1420
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• 2008

• Bulletin of the Korean Chemical Society
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• v.25 no.8
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• pp.1117-1118
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• 2004

• Bulletin of the Korean Chemical Society
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• v.30 no.12
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• pp.3105-3106
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• 2009

• Bulletin of the Korean Chemical Society
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• v.28 no.1
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• pp.29-30
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• 2007

• Applied Chemistry for Engineering
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• v.9 no.4
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• pp.481-485
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• 1998

Hydrated aluminum sulfate, an inorganic polymer, was synthesized from kaolin in $H_2SO_4$ solution using microwave energy. The maximum rates of alumina extracted from calcined kaolin were 72.8% in a conventional process ($80^{\circ}C$, 1M, and 180min) and 99.9% in a microwave process ($90^{\circ}C$, 1M, and 60 min). Compared with the conventional one, the hydrated aluminum sulfate synthesized under the microwave process had layer structure consisting of plate-shaped large grains. After synthesis and then calcination at $1100^{\circ}C$, both products on conventional and microwave processes were ${\gamma}-Al_2O_3$ with agglomerated powders of spherical shape. The specific area of the products in conventional and microwave processes were 113.5 and $106.6m^2/g$, and their average grain sizes were 46.5 an $26.3{\mu}m$, respectively.

• 한국신재생에너지학회:학술대회논문집
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• 2011.11a
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• pp.108.2-108.2
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• 2011

This presentation shows energy-efficiency of microwave-accelerated esterification of free fatty acid with a heterogeneous catalyst by net microwave power measurement. In the reaction condition of 5wt% sulfated zirconia and 1:20 molar ratio of oil to methanol at $60^{\circ}C$ and atmospheric pressure, more than 90% conversion of the esterification was achieved in 20 minutes by microwave heating, while it took about 130 minutes by conventional heating. Electric energy consumption for the microwave heating in this accelerated esterification was only 67% of estimated minimum heat energy demand because of significantly reduced reaction time.

• Bulletin of the Korean Chemical Society
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• v.32 no.11
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• pp.4001-4004
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• 2011

Various 5-substituted 1H-tetrazole derivatives were synthesized in a simple and environmentally benign method from the reaction of aryl and benzyl nitriles with sodium azide in solvent-free media using montmorillonite K-10 clay as solid recyclable heterogeneous acidic catalyst and microwave irradiation in good yields and short reaction times.

• Bulletin of the Korean Chemical Society
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• v.34 no.10
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• pp.2963-2967
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• 2013

This paper describes a simple and efficient method involving domino Knovenegal/$6{\pi}$ electrocyclization for the preparation of a variety of 2H-pyrans using microwave irradiation under solvent- and catalyst-free conditions. This method offers the advantages of a green approach, high yields, and short reaction times. Sixteen compounds (9a-p) were obtained in good to excellent yields using the procedure.