open access

https://hdl.handle.net/2115/33047

Design of a high-temperature and high-pressure liquid flow cell for x-ray absorption fine structure measurements under catalytic reaction conditions

英語

2008-01-28

American Institute of Physics

Review of Scientific Instruments

79(1)

014101

The design and performance of a new high-pressure and high-temperature cell for measurement of x-ray absorption fine structure (XAFS) spectra of solid catalysts working in a flowing liquid are presented. The cell has flat, high-purity sintered cubic boron nitride (c-BN) windows which can tolerate high temperature (900 K) and high pressure (10 MPa). The c-BN is a new material which has the highest tensile strength, second only to diamond, and is also chemically and thermally stable. The use of the cell is demonstrated for measurements of PtPd/Al2O3 and Ni2P/SiO2 hydrodesulfurization catalysts at reaction conditions. A technique called delta χ (Δχ), involving determining the difference between XAFS spectra of the sample at reaction conditions and the bare sample, is introduced.

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0034-6748

AA00817730