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X-ray physico-chemical imaging during activation of cobalt-based Fischer–Tropsch synthesis catalysts

DOI: 10.1098/rsta.2017.0057 DOI Help

Authors: Andrew M. Beale (University College London; Research Complex at Harwell) , Simon D. M. Jacques (Research Complex at Harwell; Manchester University) , Marco Di Michiel (ESRF) , J. Frederick W. Mosselmans (Diamond Light Source) , Stephen W. T. Price (Diamond Light Source) , Pierre Senecal (University College London; Research Complex at Harwell) , Antonios Vamvakeros (University College London; Research Complex at Harwell) , James Paterson (BP Chemicals)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Philosophical Transactions Of The Royal Society A: Mathematical, Physical And Engineering Sciences , VOL 376

State: Published (Approved)
Published: November 2017
Diamond Proposal Number(s): 13939 , 14440

Open Access Open Access

Abstract: The imaging of catalysts and other functional materials under reaction conditions has advanced significantly in recent years. The combination of the computed tomography (CT) approach with methods such as X-ray diffraction (XRD), X-ray fluorescence (XRF) and X-ray absorption near-edge spectroscopy (XANES) now enables local chemical and physical state information to be extracted from within the interiors of intact materials which are, by accident or design, inhomogeneous. In this work, we follow the phase evolution during the initial reduction step(s) to form Co metal, for Co-containing particles employed as Fischer–Tropsch synthesis (FTS) catalysts; firstly, working at small length scales (approx. micrometre spatial resolution), a combination of sample size and density allows for transmission of comparatively low energy signals enabling the recording of ‘multimodal’ tomography, i.e. simultaneous XRF–CT, XANES–CT and XRD–CT. Subsequently, we show high-energy XRD–CT can be employed to reveal extent of reduction and uniformity of crystallite size on millimetre-sized TiO2 trilobes. In both studies, the CoO phase is seen to persist or else evolve under particular operating conditions and we speculate as to why this is observed.

Journal Keywords: physico-chemical tomography cobalt Fischer–Tropsch spectroscopy scattering

Subject Areas: Chemistry, Materials, Technique Development


Instruments: I18-Microfocus Spectroscopy

Other Facilities: ESRF

Documents:
20170057.full.pdf