Electrochemical Study on Palladium Acetate + p-Benzoquinone + Molybdovanadophosphate System by Cyclic Voltammetry

Abstract

Palladium compounds + p-benzoquinone (BQ) + molybdovanadophosphate are of great interest in many catalytic reactions. The electrochemical characteristics of the palladium acetate + BQ + molybdovanadophosphate system in acid aqueous solution are studied by cyclic voltammetry. The redox process of palladium species involves a two-electron reaction, which can be expressed as Pd 2+ + 2e T Pd 0 . Since both BQ and molybdovanadophosphate can reoxidize Pd 0 to Pd 2+ , an appropriate amount of BQ or molybdovanadophosphate can enhance the catalytic activity of Pd 2+ and the oxidative reaction rate. However, excessive BQ or molybdovanadophosphate decreases the reaction rate. Since molybdovanadophosphate can reoxidize the reduced form of BQ, adding an appropriate amount of molybdovanadophosphate to the Pd 2+ + BQ system enhances the catalytic activity of Pd 2+ . The injection of oxygen to Pd 2+ + BQ + molybdovanadophosphate system can increase the oxidative reaction rate of molybdovanadophosphate and ultimately enhance the activity of Pd 2+ .

Electrochemical Reduction of CO2 to Formate on Glacial Acetic Acid-Refluxed Pd Nanoclusters

“…[20][21][22][23][24][25][26][27][28][29][30][31] Originally, acetic acid was mostly used to react with palladium and HNO 3 to form palladium acetate, which is a widely used catalyst or precursor in metal-catalyzed organic synthesis. [32][33][34][35][36][37] However, in this work, it is found that acetic acid would only change the morphology of the palladium surface instead of transforming palladium into palladium acetate when HNO 3 is not added into the reaction, which makes it to become a potential method to modify the surface of Pd. Here, in comparison with the as-prepared Pd/carbon black (Pd/XC72) powders, the composites are refluxed in water and glacial acetic acid, respectively (denoted as W-Pd/XC72 and A-Pd/XC72) to explore the electrocatalysis of the CO 2 ER on Pd/C NCs.…”

Control of reaction pathways in the photochemical reaction of a quinone with tetramethylethylene by metal binding

“…In contrast, a very small negative shift of the redox (ΔE 1/2 = −0.02 V) was observed without a notable change of the redox profile of the quinone upon mixing with Pd(OAc) 2 , having the irreversible reduction peak at around −0.52 V vs. Fc/Fc + . 38 This result indicates that Pd(OAc) 2 is electrically rather neutral for the one-electron redox process of the quinone. This agrees with the results obtained in the 1 H NMR spectroscopic study described above.…”

Ubiquitous Benzoquinones, Multitalented Compounds for Palladium‐Catalyzed Oxidative Reactions

“…Electrochemical study of a mixture of Pd(OAc) 2 and BQ has shown that progressive addition of BQ to an aqueous solution of Pd(OAc) 2 increases the oxidation peak current of the Pd 0 /Pd II couple, thus indicating that BQ promotes the oxidation of Pd 0 . However, the presence of an excessive amount of BQ results in a decrease in the peak current, with the best results being obtained between one and two equivalents of BQ per palladium 52…”