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Real-time multi-length scale chemical tomography of fixed bed reactors during the oxidative coupling of methane reaction

DOI: 10.1016/j.jcat.2020.03.027 DOI Help

Authors: Antonios Vamvakeros (University College London; Research Complex at Harwell; Finden Limited) , Dorota Matras (Research Complex at Harwell; University of Manchester) , Simon D. M. Jacques (Finden Limited) , Marco Di Michiel (ESRF- The European Synchrotron) , Stephen W. T. Price (Finden Limited; Diamond Light Source) , Pierre Senecal (University College London; Research Complex at Harwell) , Miren Agote Aran (University College London; Research Complex at Harwell) , Vesna Middelkoop (Flemish Institute for Technological Research, VITO NV) , Gavin B. G. Stenning (ISIS Neutron and Muon Source) , J. Frederick W. Mosselmans (Diamond Light Source) , Ilyas Z. Ismagilov (Boreskov Institute of Catalysis SB RAS) , Andrew M. Beale (University College London; Research Complex at Harwell; Finden Limited)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Catalysis , VOL 386 , PAGES 39 - 52

State: Published (Approved)
Published: June 2020
Diamond Proposal Number(s): 14525

Abstract: In this work, we present the results from multi-length-scale studies of a Mn-Na-W/SiO2 and a La-promoted Mn-Na-W/SiO2 catalyst during the oxidative coupling of methane reaction. The catalysts were investigated from the reactor level (mm scale) down to the single catalyst particle level (μm scale) with different synchrotron X-ray chemical computed tomography techniques (multi-modal chemical CT experiments). These operando spatially-resolved studies performed with XRD-CT (catalytic reactor) and multi-modal μ-XRF/XRD/absorption CT (single catalyst particle) revealed the multiple roles of the La promoter and how it provides the enhancement in catalyst performance. It is also shown that non-crystalline Mn species are part of the active catalyst component rather than crystalline Mn2O3/Mn7SiO12 or MnWO4.

Journal Keywords: Imaging; Xrd; Operando; Catalyst; Xrf; Micro; In situ

Subject Areas: Chemistry


Instruments: I18-Microfocus Spectroscopy

Other Facilities: ID11 and ID31 at ESRF