An in situ sample environment reaction cell for spatially resolved x-ray absorption spectroscopy studies of powders and small structured reactors

• DOI: 10.1063/1.4915321
• Publication Date: 2015-03-23T18:16:55Z
• Authors: Chu Zhang; Johan Gustafson; Lindsay R. Merte; Jonas Evertsson; Katarina Norén; Stefan Carlson; Håkan Svensson; Per-Anders Carlsson
• Keywords: X-ray absorption spectroscopy; XANES; X-Ray Spectroscopy; Monolith

An easy-to-use sample environment reaction cell for X-ray based in situ studies of powders and small structured samples, e.g., powder, pellet, monolith catalysts, is described. The design the allows flexible use appropriate transparent windows, shielding from ambient conditions, such that incident energies as low 3 keV can be used. Thus, absorption spectroscopy (XAS) measurements either transmission or fluorescence mode are facilitated. Total gas flows up to about 500 mln/min fed while temperature accurately controlled (at least) range 25–500 °C. feed composed by a versatile gas-mixing system effluent flow composition monitored with mass spectrometry (MS). These systems described briefly. Results simultaneous XAS/MS during oxidation carbon monoxide over 4% Pt/Al2O3 powder catalyst used illustrate performance terms XAS. Also, 2.2% Pd/Al2O3 2% Ag − Al2O3 catalysts have been demonstrate near-edge structure (XANES) mode. Further, was ex XANES. opens facile structure-function relationships model well realistic both form powders, pellets, coated extruded monoliths at near conditions. applicability diffraction discussed.