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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 ...

  • 2015
  • electronicrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:research.chalmers.se:0cf98933-e74d-4aef-9cec-b34a69578e93
  • https://research.chalmers.se/publication/208080URI
  • https://doi.org/10.1039/C4CY01470GDOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:art swepub-publicationtype
  • Ämneskategori:ref swepub-contenttype

Anmärkningar

  • 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 ...)

  • Creaser, Derek,1966Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)creaser (författare)
  • Grönbeck, Henrik,1966Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)ghj (författare)
  • Ojagh, Houman,1976Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)ojagh (författare)
  • Skoglundh, Magnus,1965Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)skoglund (författare)
  • Chalmers tekniska högskola (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Catalysis Science and Technology5:3, s. 1716-17302044-47532044-4761

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