Design of a continuous-flow reactor for in situ x-ray absorption spectroscopy of solids in supercritical fluids.
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.
Paul Scherrer Institut, 5232 Villigen PSI, Switzerland. marian.dreher@psi.ch
M
M
Dreher
E
E
De Boni
M
M
Nachtegaal
J
J
Wambach
F
F
Vogel
D002244:Carbon / Q000737:chemistry; D002384:Catalysis; D004867:Equipment Design; D000431:Ethanol / Q000737:chemistry; D044367:Phase Transition; D011312:Pressure; D012428:Ruthenium / Q000737:chemistry; D012449:Safety; D013696:Temperature; D056928:X-Ray Absorption Spectroscopy / Q000295:instrumentation*
D000431:Ethanol; D002244:Carbon; D012428:Ruthenium