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Evolution of Hierar...
Evolution of Hierarchically Porous Nickel Alumina Catalysts Studied by X-Ray Ptychography
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- Weber, Sebastian (författare)
- Karlsruhe Institute of Technology
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- Diaz, Ana (författare)
- Paul Scherrer Institute
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- Holler, Mirko (författare)
- Paul Scherrer Institute
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- Schropp, Andreas (författare)
- German Electron Synchrotron (DESY)
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- Lyubomirskiy, Mikhail (författare)
- German Electron Synchrotron (DESY)
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- Abel, Ken L. (författare)
- Leipzig University
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- Kahnt, Maik (författare)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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- Jeromin, Arno (författare)
- German Electron Synchrotron (DESY)
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- Kulkarni, Satishkumar (författare)
- German Electron Synchrotron (DESY)
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- Keller, Thomas F. (författare)
- University of Hamburg,German Electron Synchrotron (DESY)
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- Gläser, Roger (författare)
- Leipzig University
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- Sheppard, Thomas L. (författare)
- Karlsruhe Institute of Technology
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(creator_code:org_t)
- 2022-01-20
- 2022
- Engelska.
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Ingår i: Advanced science (Weinheim, Baden-Wurttemberg, Germany). - : Wiley. - 2198-3844. ; 9:8, s. 2105432-2105432
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http://dx.doi.org/10... (free)
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https://onlinelibrar...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The synthesis of hierarchically porous materials usually requires complex experimental procedures, often based around extensive trial and error approaches. One common synthesis strategy is the sol-gel method, although the relation between synthesis parameters, material structure and function has not been widely explored. Here, in situ 2D hard X-ray ptychography (XRP) and 3D ptychographic X-ray computed tomography (PXCT) are applied to monitor the development of hierarchical porosity in Ni/Al2 O3 and Al2 O3 catalysts with connected meso- and macropore networks. In situ XRP allows to follow textural changes of a dried gel Ni/Al2 O3 sample as a function of temperature during calcination, activation and CO2 methanation reaction. Complementary PXCT studies on dried gel particles of Ni/Al2 O3 and Al2 O3 provide quantitative information on pore structure, size distribution, and shape with 3D spatial resolution approaching 50 nm, while identical particles are imaged ex situ before and after calcination. The X-ray imaging results are correlated with N2 -sorption, Hg porosimetry and He pycnometry pore characterization. Hard X-ray nanotomography is highlighted to derive fine structural details including tortuosity, branching nodes, and closed pores, which are relevant in understanding transport phenomena during chemical reactions. XRP and PXCT are enabling technologies to understand complex synthesis pathways of porous materials.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Annan kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Other Chemical Engineering (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Nyckelord
- heterogeneous catalysis
- hierarchical porosity
- imaging
- pore characterization
- sol-gel method
- X-ray ptychography
- X-ray tomography
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- Av författaren/redakt...
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Weber, Sebastian
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Diaz, Ana
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Holler, Mirko
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Schropp, Andreas
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Lyubomirskiy, Mi ...
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Abel, Ken L.
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visa fler...
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Kahnt, Maik
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Jeromin, Arno
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Kulkarni, Satish ...
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Keller, Thomas F ...
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Gläser, Roger
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Sheppard, Thomas ...
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- TEKNIK OCH TEKNOLOGIER
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TEKNIK OCH TEKNO ...
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och Kemiteknik
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och Annan kemiteknik
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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och Annan fysik
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Advanced science ...
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Lunds universitet