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Redox-Driven Migrat...
Redox-Driven Migration of Copper Ions in the Cu-CHA Zeolite as Shown by the InSitu PXRD/XANES Technique
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- Andersen, Casper Welzel (författare)
- Aarhus University
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- Borfecchia, Elisa (författare)
- University of Turin,Haldor Topsøe A/S
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- Bremholm, Martin (författare)
- Aarhus University
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- Jørgensen, Mads Ry Vogel (författare)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,Aarhus University
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- Vennestrøm, Peter Nicolai Ravnborg (författare)
- Haldor Topsøe A/S
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- Lamberti, Carlo (författare)
- Southern Federal University,University of Turin
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- Lundegaard, Lars Fahl (författare)
- Haldor Topsøe A/S
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- Iversen, Bo Brummerstedt (författare)
- Aarhus University
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(creator_code:org_t)
- 2017-07-24
- 2017
- Engelska.
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Ingår i: Angewandte Chemie - International Edition. - : Wiley. - 1433-7851. ; 56:35, s. 10367-10372
- Relaterad länk:
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http://dx.doi.org/10...
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https://pure.au.dk/w...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Using quasi-simultaneous insitu PXRD and XANES, the direct correlation between the oxidation state of Cu ions in the commercially relevant deNOx NH3-SCR zeolite catalyst Cu-CHA and the Cu ion migration in the zeolitic pores was revealed during catalytic activation experiments. A comparison with recent reports further reveals the high sensitivity of the redox-active centers concerning heating rates, temperature, and gas environment during catalytic activation. Previously, Cu+ was confirmed present only in the 6R. Results verify a novel 8R monovalent Cu site, an eventually large Cu+ presence upon heating to high temperatures in oxidative conditions, and demonstrate the unique potential in combining insitu PXRD and XANES techniques, with which both oxidation state and structural location of the redox-active centers in the zeolite framework could be tracked.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering (hsv//eng)
Nyckelord
- Heterogeneous catalysis
- Structure-activity relationships
- X-ray absorption spectroscopy
- X-ray diffraction
- Zeolites
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- ref (ämneskategori)
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