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Selectivity and kin...
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Chaoquan, Hu,1981Chalmers tekniska högskola,Chalmers University of Technology
(författare)
Selectivity and kinetics of methyl crotonate hydrogenation over Pt/Al2O3
- Artikel/kapitelEngelska2015
Förlag, utgivningsår, omfång ...
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2015
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electronicrdacarrier
Nummerbeteckningar
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LIBRIS-ID:oai:research.chalmers.se:0cf98933-e74d-4aef-9cec-b34a69578e93
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https://research.chalmers.se/publication/208080URI
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https://doi.org/10.1039/C4CY01470GDOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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Ämneskategori:ref swepub-contenttype
Anmärkningar
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The hydrogenation of gas-phase methyl crotonate (MC) over Pt/Al2O3 was investigated with the aim to understand C=C hydrogenation in unsaturated methyl esters. Three Pt/Al2O3 catalysts with different Pt dispersions were prepared by varying calcination temperature and evaluated for MC hydrogenation. The main products were found to be methyl butyrate (MB) and methyl 3-butenoate (M3B), resulting from hydrogenation and shift of the C=C bond in MC, respectively. The measured activity for both hydrogenation and shift of the C=C in MC was found to depend on the Pt dispersion where higher Pt dispersion favors the C=C hydrogenation reaction. The effect of reactant concentrations on the activity and selectivity for MC hydrogenation over the Pt/Al2O3 catalyst was examined in detail. Under the investigated conditions, the C=C hydrogenation was found to have a negative reaction order with respect to MC concentration but a positive H2 order. Further understanding of the MC hydrogenation was provided from H2 chemisorption experiments over the catalyst with and without pre-adsorbed MC and from transient experiments using alternating MC and H2 feeds. Based on the present experimental results, a reaction pathway was proposed to describe gas-phase MC hydrogenation over Pt/Al2O3. In order to gain more insight into the reaction, a kinetic analysis of MC hydrogenation was performed by fitting a power-law model to the kinetic data, moreover, dissociative H2 adsorption on the catalyst was found to be the rate-determining step by comparing the power-law model with the overall rate expressions derived from mechanistic considerations.
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Creaser, Derek,1966Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)creaser
(författare)
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Grönbeck, Henrik,1966Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)ghj
(författare)
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Ojagh, Houman,1976Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)ojagh
(författare)
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Skoglundh, Magnus,1965Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)skoglund
(författare)
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Chalmers tekniska högskola
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Catalysis Science and Technology5:3, s. 1716-17302044-47532044-4761
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