Catalytic hydrogenation of organic molecules is a possible method to upgrade bio-oil compounds for sustainable production of fuels.[1] Understanding the reaction processes can help improve catalyst stability and increase turnover frequencies. Thermally, i.e., using hydrogen gas, the mechanism is believed to follow a Langmuir-Hinshelwood competitive adsorption process. Electrocatalytically, the reduction of protons can provide these hydrogen equivalents, but it is less clear whether the mechanism is the same as for thermal catalysis. In this talk we will discuss the similarities between the hydrogen partial pressure in thermal catalytic hydrogenation and the applied potential in electrocatalytic hydrogenation of phenol molecules in aqueous phase.[2] Specifically, we will discuss hydrogenation at low-temperatures in aqueous phase on platinum group metals, where a Langmuir-Hinshelwood type mechanism appears to hold for both thermal and electrocatalysis. We will discuss the steps to maintain similar conditions such that the thermal and electrocatalytic variables can be compared on an even basis, and how fundamental principles from thermal catalysis apply to electrocatalysis, as well as where thermal and electrocatalytic systems may differ.

Thermal catalytic and electrocatalytic hydrogenation: Qualitative and quantitative comparisons

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ACS Spring 2023

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