Transmission and fluorescence X-ray absorption spectroscopy cell/flow reactor for powder samples under vacuum or in reactive atmospheres
AuthorsHoffman, A. S.
Debefve, L. M.
Bare, Simon R.
Gates, B. C.
KAUST DepartmentChemical Science Program
KAUST Catalysis Center (KCC)
Physical Science and Engineering (PSE) Division
Online Publication Date2016-07-26
Print Publication Date2016-07
Permanent link to this recordhttp://hdl.handle.net/10754/618378
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AbstractX-ray absorption spectroscopy is an element-specific technique for probing the local atomic-scale environment around an absorber atom. It is widely used to investigate the structures of liquids and solids, being especially valuable for characterization of solid-supported catalysts. Reported cell designs are limited in capabilities—to fluorescence or transmission and to static or flowing atmospheres, or to vacuum. Our goal was to design a robust and widely applicable cell for catalyst characterizations under all these conditions—to allow tracking of changes during genesis and during operation, both under vacuum and in reactive atmospheres. Herein, we report the design of such a cell and a demonstration of its operation both with a sample under dynamic vacuum and in the presence of gases flowing at temperatures up to 300 °C, showing data obtained with both fluorescence and transmission detection. The cell allows more flexibility in catalyst characterization than any reported.
CitationTransmission and fluorescence X-ray absorption spectroscopy cell/flow reactor for powder samples under vacuum or in reactive atmospheres 2016, 87 (7):073108 Review of Scientific Instruments
SponsorsWe thank A. Cobb and J. Roach of the University of California, Davis, Biological and Agricultural Engineering Machine Shop, for design consultation and cell fabrication, and R. Davis of the Stanford Synchrotron Radiation Lightsource (SSRL) for helpful discussions.We thank SSRL for beam time (beamline 4-1). The work was funded by the King Abdullah University of Science and Technology and by the U.S. Department of Energy, Office of Science, Basic Energy Sciences (Grant No. FG02-04ER15513). Use of SSRL, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences (Grant No. DE-AC02-76SF00515). A. S. Hoffman was supported by a fellowship from Chevron.
JournalReview of Scientific Instruments
- Publisher's Note: "Transmission and fluorescence X-ray absorption spectroscopy cell/flow reactor for powder samples under vacuum or in reactive atmospheres" [Rev. Sci. Instrum. 87, 073108 (2016)].
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