Theoretical study of selective hydrogenation in a mixture of acetylene and ethylene over Fe@W(1 1 1) bimetallic surfaces

Chun Chih Chang, Chen Hao Yeh, Jia Jen Ho

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The selectivity of formation of ethylene from the hydrogenation of acetylene is tunable to 100% on our designed catalytic surface, Fe(1,2)@W(1 1 1), of which the first two layers of a W(1 1 1) surface are replaced by Fe atoms. Three possible reaction paths for the hydrogenation of acetylene on these metal surfaces are solely formation of ethylene followed by desorption from the surface, complete hydrogenation to ethane, and decomposition to two methylene fragments. The tested monometallic and bimetallic surfaces were W(1 1 1), Fe(1)@W(1 1 1), Fe(1,2)@W(1 1 1), Fe(1 1 1), W(1)@Fe(1 1 1) and W(1,2)@Fe(1 1 1); Fe(1)@W(1 1 1) represents the first layer of tungsten (1 1 1) surface being replaced by the iron atoms, and vice versa on a W(1)@Fe(1 1 1) surface. On a Fe(1,2)@W(1 1 1) surface, the barrier to form ethylene is only 0.84 eV, the least of all specified surfaces. The barrier to further hydrogenation to C 2H5 is 2.43 eV, whereas that of CC bond scission is 2.27 eV; the latter two barriers are much greater than that, 0.42 eV, for desorption of C2H4. Ethylene could hence be the sole and final product to be desorbed from a catalytically tuned Fe(1,2)@W(1 1 1) surface in the hydrogenation of acetylene.

Original languageEnglish
Pages (from-to)296-301
Number of pages6
JournalApplied Catalysis A: General
Volume462-463
DOIs
Publication statusPublished - 2013 Jun 24

Fingerprint

Acetylene
Hydrogenation
Ethylene
Desorption
ethylene
Atoms
Tungsten
Ethane
Iron
Metals
Decomposition

Keywords

  • Acetylene
  • Bimetallic
  • Density-functional theory
  • Selective hydrogenation
  • W(1 1 1)
  • e(1 1 1)

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Theoretical study of selective hydrogenation in a mixture of acetylene and ethylene over Fe@W(1 1 1) bimetallic surfaces. / Chang, Chun Chih; Yeh, Chen Hao; Ho, Jia Jen.

In: Applied Catalysis A: General, Vol. 462-463, 24.06.2013, p. 296-301.

Research output: Contribution to journalArticle

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abstract = "The selectivity of formation of ethylene from the hydrogenation of acetylene is tunable to 100{\%} on our designed catalytic surface, Fe(1,2)@W(1 1 1), of which the first two layers of a W(1 1 1) surface are replaced by Fe atoms. Three possible reaction paths for the hydrogenation of acetylene on these metal surfaces are solely formation of ethylene followed by desorption from the surface, complete hydrogenation to ethane, and decomposition to two methylene fragments. The tested monometallic and bimetallic surfaces were W(1 1 1), Fe(1)@W(1 1 1), Fe(1,2)@W(1 1 1), Fe(1 1 1), W(1)@Fe(1 1 1) and W(1,2)@Fe(1 1 1); Fe(1)@W(1 1 1) represents the first layer of tungsten (1 1 1) surface being replaced by the iron atoms, and vice versa on a W(1)@Fe(1 1 1) surface. On a Fe(1,2)@W(1 1 1) surface, the barrier to form ethylene is only 0.84 eV, the least of all specified surfaces. The barrier to further hydrogenation to C 2H5 is 2.43 eV, whereas that of CC bond scission is 2.27 eV; the latter two barriers are much greater than that, 0.42 eV, for desorption of C2H4. Ethylene could hence be the sole and final product to be desorbed from a catalytically tuned Fe(1,2)@W(1 1 1) surface in the hydrogenation of acetylene.",
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N2 - The selectivity of formation of ethylene from the hydrogenation of acetylene is tunable to 100% on our designed catalytic surface, Fe(1,2)@W(1 1 1), of which the first two layers of a W(1 1 1) surface are replaced by Fe atoms. Three possible reaction paths for the hydrogenation of acetylene on these metal surfaces are solely formation of ethylene followed by desorption from the surface, complete hydrogenation to ethane, and decomposition to two methylene fragments. The tested monometallic and bimetallic surfaces were W(1 1 1), Fe(1)@W(1 1 1), Fe(1,2)@W(1 1 1), Fe(1 1 1), W(1)@Fe(1 1 1) and W(1,2)@Fe(1 1 1); Fe(1)@W(1 1 1) represents the first layer of tungsten (1 1 1) surface being replaced by the iron atoms, and vice versa on a W(1)@Fe(1 1 1) surface. On a Fe(1,2)@W(1 1 1) surface, the barrier to form ethylene is only 0.84 eV, the least of all specified surfaces. The barrier to further hydrogenation to C 2H5 is 2.43 eV, whereas that of CC bond scission is 2.27 eV; the latter two barriers are much greater than that, 0.42 eV, for desorption of C2H4. Ethylene could hence be the sole and final product to be desorbed from a catalytically tuned Fe(1,2)@W(1 1 1) surface in the hydrogenation of acetylene.

AB - The selectivity of formation of ethylene from the hydrogenation of acetylene is tunable to 100% on our designed catalytic surface, Fe(1,2)@W(1 1 1), of which the first two layers of a W(1 1 1) surface are replaced by Fe atoms. Three possible reaction paths for the hydrogenation of acetylene on these metal surfaces are solely formation of ethylene followed by desorption from the surface, complete hydrogenation to ethane, and decomposition to two methylene fragments. The tested monometallic and bimetallic surfaces were W(1 1 1), Fe(1)@W(1 1 1), Fe(1,2)@W(1 1 1), Fe(1 1 1), W(1)@Fe(1 1 1) and W(1,2)@Fe(1 1 1); Fe(1)@W(1 1 1) represents the first layer of tungsten (1 1 1) surface being replaced by the iron atoms, and vice versa on a W(1)@Fe(1 1 1) surface. On a Fe(1,2)@W(1 1 1) surface, the barrier to form ethylene is only 0.84 eV, the least of all specified surfaces. The barrier to further hydrogenation to C 2H5 is 2.43 eV, whereas that of CC bond scission is 2.27 eV; the latter two barriers are much greater than that, 0.42 eV, for desorption of C2H4. Ethylene could hence be the sole and final product to be desorbed from a catalytically tuned Fe(1,2)@W(1 1 1) surface in the hydrogenation of acetylene.

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KW - e(1 1 1)

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