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Issue 12, 2020
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Do defects in PAHs promote catalytic activity in space? Stone–Wales pyrene as a test case

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Abstract

Using density functional theory (DFT), we studied the formation of Stone–Wales defects in pyrene, as a prototype PAH molecule. In addition, we studied the reactivity of the defective and pristine pyrenes toward hydrogenation, a process that can occur in some regions of the interstellar medium. We found that the formation of the defect requires overcoming energies of the order of 8.4 eV, but the defective structure is stable due to the high reverse reaction barrier (approx. 6 eV). We also found that the presence of the defect decreases the sticking barrier for the first hydrogenation and promotes more stable singly and doubly hydrogenated intermediates with respect to that of the pristine pyrene. Finally, our results show that both Stone–Wales pyrene and pristine pyrenes can lead to the formation of H2 through an extraction mechanism involving H atoms attached on distal carbon atoms with energy barriers below 2 eV.

Graphical abstract: Do defects in PAHs promote catalytic activity in space? Stone–Wales pyrene as a test case

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Supplementary files

Article information


Submitted
02 Dec 2019
Accepted
28 Feb 2020
First published
28 Feb 2020

This article is Open Access

Phys. Chem. Chem. Phys., 2020,22, 6738-6748
Article type
Paper

Do defects in PAHs promote catalytic activity in space? Stone–Wales pyrene as a test case

D. Campisi and A. Candian, Phys. Chem. Chem. Phys., 2020, 22, 6738
DOI: 10.1039/C9CP06523G

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