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In situ studies of ...
In situ studies of the oxidation of HCl over RuO2 model catalysts: Stability and reactivity
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Zweidinger, S. (författare)
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Hofmann, J. P. (författare)
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Balmes, O. (författare)
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- Lundgren, Edvin (författare)
- Lund University,Lunds universitet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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Over, H. (författare)
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(creator_code:org_t)
- Elsevier BV, 2010
- 2010
- Engelska.
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Ingår i: Journal of Catalysis. - : Elsevier BV. - 1090-2694 .- 0021-9517. ; 272:1, s. 169-175
- Relaterad länk:
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http://dx.doi.org/10...
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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
- Structure-activity experiments were performed for the HCl oxidation reaction (Deacon-like process) over RuO2 model catalysts - RuO2(1 1 0) and RuO2(1 0 0) - applying in situ surface X-ray diffraction (SXRD) combined with on-line mass spectrometry. The studied model catalysts turned out to be long-term stable under reaction conditions with gas feed ratios p(HCl):p(O-2) ranging from 1:4 to 4:1 in the mbar pressure regime and temperatures as high as 685 K. Even pure HCl exposure in the mbar regime was not able to reduce RuO2 below 600 K; above 650 K chemical reduction of the oxide sets in. Under strongly oxidizing reaction conditions, the (surface) oxides grow slowly in thickness. On-line reactivity experiments of both types of model catalysts in a batch reactor yield a mean turn-over frequency (TOP) of 0.6 Cl-2 molecules per second and active site for the HCl oxidation at 650 K and initial partial pressures of p(HCl) = 2 mbar and p(O-2) = 0.5 mbar. The HCl oxidation over RuO2 is therefore considered to be structure insensitive. (C) 2010 Elsevier Inc. All rights reserved.
Ämnesord
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Nyckelord
- RuO2
- Reactivity
- Stability
- Surfaces
- Heterogeneous catalysis
- In situ SXRD
- Deacon process
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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