S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Sonochemical synthesis of nanostructured catalysts
- Suslick, Kenneth S.; Hyeon, Taeghwan; Fang, Mingming; Cichowlas, Andrzej A.
- Issue Date
- Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, Vol.204 No.1-2, pp.186-192
- Sonochemistry arises from acoustic cavitation; the formation, growth, and collapse of bubbles in a liquid. The implosive collapse of a bubble generates a localized hot spot; a temperature of similar to 5000 K and pressure of similar to 1800 atm, with cooling rates that exceed 10(9) K s(-1). Using these extreme conditions, we have developed a new synthetic technique for the synthesis of nanostructured inorganic materials. When irradiated with high intensity ultrasound in low volatility solvents under argon, volatile organometallic precursors produce high surface area solids that consist of agglomerates of nanometer clusters. These sonochemically produced nanostructured solids are active heterogeneous catalysts for hydrocarbon reforming and CO hydrogenation. For Fe and Co, nanostructured metals are formed: for Mo and W, metal carbides (e.g., Mo2C) are produced. Using polymeric ligands (e.g., polyvinylpyrrolidone) or oxide supports (alumina or silica), the initially formed nanoscale dusters can be trapped as colloids or supported catalysts, respectively.
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- College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Chemical Convergence for Energy and Environment (에너지환경 화학융합기술전공)Journal Papers (저널논문_에너지환경 화학융합기술전공)