Abstract
The possibility of controlling the rate of ethylene hydrogenation on a platinum nanocoating is established by applying to it electric potentials of different polarities and magnitudes from an external voltage source. At a negative potential of −10 V, the hydrogenation rate increases by 4%, whereas at a positive potential of +10 V, the hydrogenation rate increases by 42% under the conditions of the experiment at room temperature, atmospheric pressure, and an initial mixture composition of 0.09C2H4 + 0.91H2. Quantum-chemical calculations of the energy of the reaction of platinum hydride with hydrogen, Pt2H2 + H2 → Pt2H3 + H, and the energy characteristics of similar reactions involving negatively and positively charged Pt2H2 are performed. It has been demonstrated that the presence of a negative or positive charge on Pt2H2 lowers the endothermicity of formation of H radicals by 18.4 or 22.5 kcal/mol, respectively. Based on the calculation results, a mechanism is proposed to explain the effect of the charge of a platinum coating on its catalytic activity in ethylene hydrogenation.
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Original Russian Text © V.N. Korchak, M.V. Grishin, M.Ya. Bykhovskii, A.K. Gatin, V.G. Slutskii, V.A. Kharitonov, S.A. Tsyganov, B.R. Shub, 2017, published in Khimicheskaya Fizika, 2017, Vol. 36, No. 11, pp. 29–33.
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Korchak, V.N., Grishin, M.V., Bykhovskii, M.Y. et al. Ethylene Hydrogenation on a Platinum Nanocoating at Various Electric Potentials. Russ. J. Phys. Chem. B 11, 932–936 (2017). https://doi.org/10.1134/S1990793117060057
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DOI: https://doi.org/10.1134/S1990793117060057