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Rev Sci Instrum. 2012 May;83(5):054101. doi: 10.1063/1.4719921.

Design of a continuous-flow reactor for in situ x-ray absorption spectroscopy of solids in supercritical fluids.

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Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.


This paper presents the design and performance of a novel high-temperature and high-pressure continuous-flow reactor, which allows for x-ray absorption spectroscopy or diffraction in supercritical water and other fluids under high pressure and temperature. The in situ cell consists of a tube of sintered, polycrystalline aluminum nitride, which is tolerant to corrosive chemical media, and was designed to be stable at temperatures up to 500 °C and pressures up to 30 MPa. The performance of the reactor is demonstrated by the measurement of extended x-ray absorption fine structure spectra of a carbon-supported ruthenium catalyst during the continuous hydrothermal gasification of ethanol in supercritical water at 400 °C and 24 MPa.

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