Performance of B18, the Core EXAFS Bending Magnet beamline at Diamond

Dent, A. J.; Cibin, Giannantonio; Ramos, Silvia; Parry, Stephen; Gianolio, Diego; Smith, Andrew D.; Scott, Stewart M.; Varandas, L.; Patel, Suketu; Pearson, M.; Hudson, L.; Krumpa, N.A.; Marsch, A.S.; Robbins, Phil

doi:10.1088/1742-6596/430/1/012023

Cited by 45 publications

(39 citation statements)

References 4 publications

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“…Operando spatio-temporal QEXAFS measurements at the Pd K edge QEXAFS measurements were made at the core EXAFS beamline B18 [25,26] of the Diamond Light Source, using a Si (1 1 1) double crystal monochromator and ion chambers for detection of X-ray absorption, normalisation, and energy scale (Pd foil) calibration. The dimensions of the X-ray beam used to sample through the 4 mm i.e.…”

Section: Catalyst Synthesismentioning

confidence: 99%

Effects of Cl on the reduction of supported PdO in ethanol/water solvent mixtures

Brazier

Newton

Barreiro

et al. 2017

Catalysis, Structure & Reactivity

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Section: Catalyst Synthesismentioning

confidence: 99%

Effects of Cl on the reduction of supported PdO in ethanol/water solvent mixtures

Brazier

Newton

Barreiro

et al. 2017

Catalysis, Structure & Reactivity

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“…Measurements used a double crystal Si (111) monochromator [66,67] for EXAFS in the range of 19,800 to 21,500 eV. All pellet (diluted with BN) samples of the as prepared materials and reference samples were collected in transmission mode.…”

Section: Catalyst Characterisationmentioning

confidence: 99%

Catalysts for the Selective Oxidation of Methanol

2016

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Abstract:In industry, one of the main catalysts typically employed for the selective oxidation of methanol to formaldehyde is a multi-component oxide containing both bulk Fe 2 (MoO 4 ) 3 and excess MoO 3 . It is thought that the excess MoO 3 primarily acts to replace any molybdenum lost through sublimation at elevated temperatures, therefore preventing the formation of an unselective Fe 2 O 3 phase. With both oxide phases present however, debate has arisen regarding the active component of the catalyst. Work here highlights how catalyst surfaces are significantly different from bulk structures, a difference crucial for catalyst performance. Specifically, Mo has been isolated at the surface as the active surface species. This leaves the role of the Fe in the catalyst enigmatic, with many theories postulated for its requirement. It has been suggested that the supporting Fe molybdate phase enables lattice oxygen transfer to the surface, to help prevent the selectivity loss which would occur in the resulting oxygen deficit environment. To assess this phenomenon in further detail, anaerobic reaction with methanol has been adopted to evaluate the performance of the catalyst under reducing conditions.

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“…The electron beam at Diamond has an operating voltage of 3 GeV and a typical current of 300 mA. B18 is tailored for general-purpose X-ray absorption spectroscopy in the energy range 2.05-35 keV (Dent et al, 2013), but could be readily adapted for energy-dispersive XRD. The X-rays at B18 are generated from a bendingmagnet source.…”

Section: Experimental Details 21 Beamline Descriptionmentioning

confidence: 99%

High-resolution X-ray diffraction with no sample preparation

Hansford

Turner

Degryse

et al. 2017

Acta Crystallogr A Found Adv

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It is shown that energy-dispersive X-ray diffraction (EDXRD) implemented in a back-reflection geometry is extremely insensitive to sample morphology and positioning even in a high-resolution configuration. This technique allows highquality X-ray diffraction analysis of samples that have not been prepared and is therefore completely non-destructive. The experimental technique was implemented on beamline B18 at the Diamond Light Source synchrotron in Oxfordshire, UK. The majority of the experiments in this study were performed with pre-characterized geological materials in order to elucidate the characteristics of this novel technique and to develop the analysis methods. Results are presented that demonstrate phase identification, the derivation of precise unitcell parameters and extraction of microstructural information on unprepared rock samples and other sample types. A particular highlight was the identification of a specific polytype of a muscovite in an unprepared mica schist sample, avoiding the time-consuming and difficult preparation steps normally required to make this type of identification. The technique was also demonstrated in application to a small number of fossil and archaeological samples. Back-reflection EDXRD implemented in a high-resolution configuration shows great potential in the crystallographic analysis of cultural heritage artefacts for the purposes of scientific research such as provenancing, as well as contributing to the formulation of conservation strategies. Possibilities for moving the technique from the synchrotron into museums are discussed. The avoidance of the need to extract samples from high-value and rare objects is a highly significant advantage, applicable also in other potential research areas such as palaeontology, and the study of meteorites and planetary materials brought to Earth by sample-return missions.

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Performance of B18, the Core EXAFS Bending Magnet beamline at Diamond

Cited by 45 publications

References 4 publications

Effects of Cl on the reduction of supported PdO in ethanol/water solvent mixtures

Effects of Cl on the reduction of supported PdO in ethanol/water solvent mixtures

Catalysts for the Selective Oxidation of Methanol

High-resolution X-ray diffraction with no sample preparation

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