A remarkable shape-catalytic effect of confinement on the rotational isomerization of small hydrocarbons

Santiso, Erik E.; Gubbins, Keith E.; Buongiorno Nardelli, Marco

doi:10.1063/1.2819238

Title: A remarkable shape-catalytic effect of confinement on the rotational isomerization of small hydrocarbons

Journal Article · Tue Jan 01 00:00:00 EST 2008 · The Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.2819238· OSTI ID:1004451

Santiso, Erik E. ^[1]; Gubbins, Keith E. ^[1]; Buongiorno Nardelli, Marco ^[1]

ORNL

As part of an effort to understand the effect of confinement by porous carbons on chemical reactions, we have carried out density functional theory calculations on the rotational isomerization of three four-membered hydrocarbons: n-butane, 1-butene, and 1,3-butadiene. Our results show that the interactions with the carbon walls cause a dramatic change on the potential energy surface for pore sizes comparable to the molecular dimensions. The porous material enhances or hinders reactions depending on how similar is the shape of the transition state to the shape of the confining material. The structure of the stable states and their equilibrium distributions are also drastically modified by confinement. Our results are consistent with a doubly exponential behavior of the reaction rates as a function of pore size, illustrating how the shape of a catalytic support can dramatically change the efficiency of a catalyst. (51 refs.)

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1004451

Journal Information:: The Journal of Chemical Physics, Vol. 128, Issue 3; ISSN 0021-9606

Country of Publication:: United States

Language:: English

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37 INORGANIC
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Title: A remarkable shape-catalytic effect of confinement on the rotational isomerization of small hydrocarbons

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