Structurally Disordered Pd−P Nanoparticles as Effective Catalysts for the Production of Hydrogen Peroxide by the Anthraquinone Method

Abstract

The properties of the catalyst based on structurally disordered PdÀ P nanoparticles supported on a carbon support (PdÀ P/C) in the preparation of hydrogen peroxide by the anthraquinone method have been studied. It is shown that a high yield of H 2 O 2 is observed upon sequential hydrogenation of 2000 mol of eAQ (mol Pd) À 1 . The H 2 O 2 yield reaches 96 %-97 %. PdÀ P nanoparticles are more active in the hydrogenation of 2-ethyl-9,10anthraquinone than Pd 6 P crystalline phosphide. In terms of H 2 O 2 yield, PdÀ P/C catalysts are superior to known catalysts: Pd/ C, Pd/Al 2 O 3 . Based on the data of X-ray powder diffraction, X-ray photoelectron spectroscopy, Inductively Coupled Plasma and thermogravimetry, the main reasons for the deactivation of PdÀ P/C catalysts have been established. Crystallization of the structurally disordered PdÀ P nanoparticles, poisoning by eAQ conversion products and leaching of the active component are considered to be possible reasons of the PdÀ P/C catalyst deactivation.

Research progress of electrocatalysts for the preparation of H2O2 by electrocatalytic oxygen reduction reaction

“…The principle of the anthraquinone method is that 2‐ethyl anthraquinone is hydrogenated with hydrogen in a fixed bed to obtain 2‐ethyl‐hydro anthraquinone solution and then reacts with air in an oxidation tower to reduce the hydroanthraquinone to anthraquinone, and generate hydrogen peroxide at the same time. It is only applicable to the problem of the transportation costs caused by large‐scale production, and the palladium‐based precious metal catalyst used for catalysis makes the production cost of the anthraquinone method high 8 …”

“…It is only applicable to the problem of the transportation costs caused by large-scale production, and the palladium-based precious metal catalyst used for catalysis makes the production cost of the anthraquinone method high. 8 In addition to the preparation of hydrogen peroxide by anthraquinone method, there is the isopropyl ketone method, 9 electrolysis method, 10 direct hydrogen and oxygen synthesis method, 11 photocatalytic method, 12,13 and electrochemical method. 14 From the perspective of energy consumption and environmental protection, the isopropyl ketone method will produce a large amount of isopropyl ketone, and the energy consumption of the electrolytic method is too high, which is not suitable for large-scale applications.…”