Redox Behavior of Fe‐Mo‐O Catalysts Studied by Ultrarapid In Situ Diffraction

Jacques, Simon D. M.; Leynaud, Olivier; Strusevich, D.; Beale, Andrew M.; Sankar, Gopinathan; Martin, Christopher M.; Barnes, P.

doi:10.1002/anie.200502897

Cited by 35 publications

(18 citation statements)

References 25 publications

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“…A furnace and a capillary gas delivery system, developed at Birkbeck College [23], were used to obtain, in situ, the required starting material-dehydrated MIL-53(Cr)-and to apply smooth gradual changes in CO 2 pressure. Two types of experiments were performed: i) one experiment was conducted with continuous pressure variations (in this case, an approximate rate of 1 bar per 10 s was used from 1 to 10 bar and backwards for several cycles) and ii) the second experiment corresponded to a long experiment in which the CO 2 pressure was increased/decreased from 1 to 10 bar via 1 bar steps of 45 s each.…”

Section: Methodsmentioning

confidence: 99%

An Explanation for the Very Large Breathing Effect of a Metal–Organic Framework during CO₂ Adsorption

et al. 2007

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The unusual adsorption behavior of CO2 in a nanoporous hybrid metal– organic solid is discussed (see figure). The results indicate that the gas adsorption–desorption step is related to a breathing phenomenon. This study also suggests that the main interactions responsible for the breathing phenomenon are strong guest–framework CO2–OH interactions as well as CO2–CO2 interactions along the tunnels present in the structure.

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Section: Methodsmentioning

confidence: 99%

An Explanation for the Very Large Breathing Effect of a Metal–Organic Framework during CO₂ Adsorption

et al. 2007

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“…The experiments were performed using an experimental setup similar to that described previously, however heat was supplied from a hot air gun rather than a block furnace [38]. The setup is detailed in Fig.…”

Section: In Situ Techniquesmentioning

confidence: 99%

A Combined Multi-Technique In Situ Approach Used to Probe the Stability of Iron Molybdate Catalysts During Redox Cycling

et al. 2009

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A setup combining a number of techniques (WAXS, XANES and UV-Vis) has been used to probe the stability of an iron molybdate catalyst during redox cycling. The catalyst was first reduced under anaerobic methanol/ helium conditions, producing formaldehyde and then regenerated using air. Although in this test-case the catalyst and conditions differ from that of a commercial catalyst bed we demonstrate how such a setup can reveal new information on catalyst materials.

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“…1 The tetragonal L1 0 structure of the b 1 -PdZn alloy with the distances (Å) of the shortest Pd-Pd and Pd-Zn bonds shown. [29][30][31][32][33][34][35] Here we report in situ synchrotron XRD, complemented by EXAFS and DRIFTS of adsorbed CO, with the aim of understanding the formation of Pd-Zn alloys in selective propane dehydrogenation catalysts. 23 can be described as a tetragonal distortion of the CsCl structure with the Pd atoms in the corners of the cell and the Zn atom at the center.…”

Section: Introductionmentioning

confidence: 99%

Structural evolution of an intermetallic Pd–Zn catalyst selective for propane dehydrogenation

Gallagher

Childers

Zhao

et al. 2015

Phys. Chem. Chem. Phys.

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We report the structural evolution of Pd-Zn alloys in a 3.6% Pd-12% Zn/Al2O3 catalyst which is selective for propane dehydrogenation. High signal-to-noise, in situ synchrotron X-ray diffraction (XRD) was used quantitatively, in addition to in situ diffuse-reflectance infrared Fourier transform spectroscopy (DRIFTS) and extended X-ray absorption fine structure (EXAFS) to follow the structural changes in the catalyst as a function of reduction temperature. XRD in conjunction with DRIFTS of adsorbed CO indicated that the β1-PdZn intermetallic alloy structure formed at reduction temperatures as low as 230 °C, likely first at the surface, but did not form extensively throughout the bulk until 500 °C which was supported by in situ EXAFS. DRIFTS results suggested there was little change in the surfaces of the nanoparticles above 325 °C. The intermetallic alloy which formed was Pd-rich at all temperatures but became less Pd-rich with increasing reduction temperature as more Zn incorporated into the structure. In addition to the β1-PdZn alloy, a solid solution phase with face-center cubic structure (α-PdZn) was present in the catalyst, also becoming more Zn-rich with increasing reduction temperature.

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Redox Behavior of Fe‐Mo‐O Catalysts Studied by Ultrarapid In Situ Diffraction

Cited by 35 publications

References 25 publications

An Explanation for the Very Large Breathing Effect of a Metal–Organic Framework during CO₂ Adsorption

An Explanation for the Very Large Breathing Effect of a Metal–Organic Framework during CO₂ Adsorption

A Combined Multi-Technique In Situ Approach Used to Probe the Stability of Iron Molybdate Catalysts During Redox Cycling

Structural evolution of an intermetallic Pd–Zn catalyst selective for propane dehydrogenation

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Redox Behavior of Fe‐Mo‐O Catalysts Studied by Ultrarapid In Situ Diffraction

Cited by 35 publications

References 25 publications

An Explanation for the Very Large Breathing Effect of a Metal–Organic Framework during CO2 Adsorption

An Explanation for the Very Large Breathing Effect of a Metal–Organic Framework during CO2 Adsorption

A Combined Multi-Technique In Situ Approach Used to Probe the Stability of Iron Molybdate Catalysts During Redox Cycling

Structural evolution of an intermetallic Pd–Zn catalyst selective for propane dehydrogenation

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An Explanation for the Very Large Breathing Effect of a Metal–Organic Framework during CO₂ Adsorption

An Explanation for the Very Large Breathing Effect of a Metal–Organic Framework during CO₂ Adsorption