Ethylene Hydrogenation on a Platinum Nanocoating at Various Electric Potentials
- 21 Downloads
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.
Keywordscontrolled catalysis platinum nanocoating electric potential of platinum ethylene hydrogenation
Unable to display preview. Download preview PDF.