The paper reports on multicomponent (Ziegler) catalytic systems based on acetylacetonate complexes of cobalt, nickel or palladium and various aluminum-containing cocatalysts of general formula М(acac)2–Red (where М = Со, Ni,...

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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.

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