In situ diffraction of highly dispersed supported platinum nanoparticles

Gallagher, James R.; Li, Tao; Zhao, Haiyan; Liu, Jingjing; Yu, Lei; Zhang, Xiaoyi; Ren, Yang; Elam, Jeffrey W.; Meyer, Randall J.; Winans, Randall E.; Miller, Jeffrey T.

doi:10.1039/c4cy00414k

Cited by 44 publications

(43 citation statements)

References 55 publications

(51 reference statements)

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“…Due to their small size a high fraction of the atoms are at the surface and are oxidized in air. Therefore, to obtain meaningful structural information the data has to be collected in situ [36]. Diffraction patterns were collected at 600°C after reduction and then after cooling to room temperature.…”

Section: In Situ Xrdmentioning

confidence: 99%

Structure and reactivity of Pt–In intermetallic alloy nanoparticles: Highly selective catalysts for ethane dehydrogenation

et al. 2018

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Section: In Situ Xrdmentioning

confidence: 99%

Structure and reactivity of Pt–In intermetallic alloy nanoparticles: Highly selective catalysts for ethane dehydrogenation

et al. 2018

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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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“…This phenomenon may be ascribed to the uniform distribution of Pt particles which is identical to Fig. 2c [35]. As can be seen from Fig.…”

Section: Characterization Of the Catalystsmentioning

confidence: 60%

A highly reactive and enhanced thermal stability nanocomposite catalyst based on Pt nanoparticles assembled in the inner surface of mesoporous SiO2 spherical shell

et al. 2015

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In situ diffraction of highly dispersed supported platinum nanoparticles

Abstract: In situ synchrotron diffraction in H2 reveals structural and microstructural details of supported 1–2 nm Pt nanoparticles.

Cited by 44 publications

References 55 publications

Structure and reactivity of Pt–In intermetallic alloy nanoparticles: Highly selective catalysts for ethane dehydrogenation

Structure and reactivity of Pt–In intermetallic alloy nanoparticles: Highly selective catalysts for ethane dehydrogenation

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

A highly reactive and enhanced thermal stability nanocomposite catalyst based on Pt nanoparticles assembled in the inner surface of mesoporous SiO2 spherical shell

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