Search: id:"swepub:oai:research.chalmers.se:81051ddd-b677-4ae2-b916-20ece5821766" >
Direct measurement ...
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Wang, Xueting,1991Chalmers tekniska högskola,Chalmers University of Technology
(author)
Direct measurement of enthalpy and entropy changes in NH3 promoted O2 activation over Cu−CHA at low temperature
- Article/chapterEnglish2021
Publisher, publication year, extent ...
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2021-05-03
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Wiley,2021
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electronicrdacarrier
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LIBRIS-ID:oai:research.chalmers.se:81051ddd-b677-4ae2-b916-20ece5821766
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https://doi.org/10.1002/cctc.202100253DOI
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https://research.chalmers.se/publication/523659URI
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Oxygen activation is a key step in the selective catalytic reduction of nitrogen oxides with ammonia (NH -SCR) over Cu-chabazite. We present direct measurements of oxygen adsorption at low temperatures over [NH −Cu−NH ] complexes and framework-bound Cu species in Cu-chabazite with Si/Al=14 using isothermal microcalorimetry combined with mass spectrometry. The enthalpy change for O adsorption over [NH −Cu−NH ] complexes at 200 °C is determined to be −79 kJ/mol. By fitting a Langmuir isotherm, the corresponding entropy change is determined to be −142 J/(mol*K) at 10 % O . The results show that O adsorption at low temperatures over [NH −Cu−NH ] complexes is more facile than on framework-bound Cu species. The experimental results are in agreement with density functional theory calculations showing a lower barrier for O activation over the [NH −Cu−NH ] complexes as compared to the framework-bound Cu species.
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Chen, Lin,1990Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)clin
(author)
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Vennestrøm, Peter
(author)
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Janssens, Ton
(author)
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Jansson, Jonas,1973Volvo Cars(Swepub:cth)jansson
(author)
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Grönbeck, Henrik,1966Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)ghj
(author)
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Skoglundh, Magnus,1965Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)skoglund
(author)
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Chalmers tekniska högskolaVolvo Cars
(creator_code:org_t)
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In:ChemCatChem: Wiley13:11, s. 2577-25821867-38991867-3880
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Chen, Lin, 1990
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Vennestrøm, Pete ...
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Janssens, Ton
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NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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NATURAL SCIENCES
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