![]() ![]() ![]() Varying the flow rate of propylene through the HFE did not affect the product distribution, indicating that mass transfer limitations are likely absent. At 1.2 V, quantities of propylene glycol again increase. SEM images show extensive dissolution of Pd does not occur at pH 4, and formation of PdO is favored, as confirmed by post-analysis by XPS. At pH 4, allyl alcohol and acrolein were detected in the electrolyte up to 1.1 V, while quantities of acetone were significantly smaller than observed at pH 1 at this potential. PdO 2 likely forms at these potentials, limiting dissolution and inducing the shift in product selectivity. At the most oxidative potential investigated (1.2 V), acetone production decreases, while propylene glycol and CO 2 emerge as reaction products. At the lower end of the applied potentials (0.7–0.9 V), allyl alcohol and acrolein are formed, likely heterogeneously by the Pd surface. Larger quantities of products were obtained at pH 1 in comparison to pH 4, mainly due to extensive dissolution of Pd to Pd 2+ in the range of 0.9–1.1 V, initiating a homogeneous chemical reaction of propylene and water to form acetone and Pd nanoparticles. The performance of Pd functionalized titanium hollow fibre electrodes ( ) in the electro-oxidation of propylene was investigated at pH 1 and pH 4 and at applied potentials ranging from 0.7 to 1.2 V vs RHE. ![]()
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