Lab Scale Fixed-Bed Reactor for Operando X-Ray Absorption Spectroscopy for Structure Activity Studies of Supported Metal Oxide Catalysts

Abstract

Lab scale fixed-bed reactor is applied for operando transmission X-ray absorption spectroscopy (XAS) for structure-activity studies of supported metal oxide catalysts under real reaction conditions. This setup includes many properties of an optimal fixed-bed reactor for operando transmission XAS studies. For instance, it is usable in a wide range of temperature (up to 1,000°C), pressure and space velocity. Besides, this operando setup can be used for transmission XAS measurements in a wide edge energy range. The potential of this reactor for operando transmission XAS is demonstrated by, as examples, the threeway catalytic performance of

Catalyst characterisation techniques and reaction cells operating at realistic conditions; towards acquisition of kinetically relevant information

“…Similar approaches for the application of intermediate X-ray energies have been developed by other scientists. 154,155 O'Brien et al achieved spatiotemporal mapping of a catalytic reactor supported on translational stages by using various a Precautions should be taken to avoid contact when using Be windows especially at high temperatures. spectroscopic techniques.…”

Silicon microfabricated reactor for operando XAS/DRIFTS studies of heterogeneous catalytic reactions

“…19,24,25 Furthermore, in order to reduce mass transfer resistances across the catalyst bed and to derive reliable intrinsic kinetic data, the operando cells must be capable of handling high space velocities. 26,27 Different configurations of operando and in situ reactor cells have been reported. [28][29][30][31][32][33][34] Among these, it is common to find modified Harrick cells, which have been used for combined DRIFTS and XAS studies.…”

“…In other studies, different configurations were reported as alternatives. 27,36,37 Among these, Chiarello et al demonstrated a spectroscopic cell for in situ transmission XAS with DRIFTS. 36 In this design, the X-ray and IR beams were focussed on the same optical window and were perpendicular to the catalyst bed.…”