Green preparation method and application of palladium-hydrogen compound

Abstract

The invention provides a green preparation method and application of a palladium-hydrogen compound, and belongs to the field of alloy synthesis. The preparation method comprises the following steps: (1) mixing ethylene glycol, polyvinylpyrrolidone, palladium salt and glycine, and performing ultrasonic dissolution to obtain a mixture A; (2) putting the mixture A into a container, and reacting in an oil bath at 120-160 DEG C for 2-10 hours to obtain a mixture B; (3) cooling the mixture B to room temperature, and centrifuging to obtain a precipitate; and (4) washing and drying the precipitate to obtain PdHx. The material is synthesized through a simple one-step method, the product can still keep stable morphology and crystal structure after being placed for a long time, and H does not escape. The preparation process is green and safe and does not involve the use of toxic reactants. Green synthesis of PdHx is not limited by palladium sources, different palladium sources are selected, the product structure is not changed, and the method is suitable for large-scale preparation. The PdHx with different hydrogen contents can be controllably synthesized by adjusting the reaction temperature and time, and the PdHx shows excellent catalytic performance and stability when being applied to the electro-catalysis alcohol oxidation reaction.

Description

technical field [0001] The invention belongs to the field of alloy synthesis, and in particular relates to a green preparation method of a palladium hydrogen compound and its application. Background technique [0002] Noble metals are currently the catalysts with the highest electrocatalytic performance. Palladium is widely used in catalytic fields such as alcohol oxidation, oxygen reduction reaction, and hydrogen evolution reaction. It has excellent resistance to CO poisoning and can perform better than platinum in some catalytic applications. electrocatalytic activity. However, palladium reserves are limited and expensive, which seriously limits the wide application of palladium. It is well known that electronic structure is the essential factor determining the catalytic performance of catalysts. Palladium and H have strong binding characteristics. Alloying hydrogen with palladium changes the structure of palladium, and then regulates the electronic structure of the pall...

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Problems solved by technology

[0003]Although so far, researchers have explored a variety of methods to prepare stable palladium hydride compounds, but the preparation methods generally have the following problems: 1) using flammable hydrogen As a hydrogen source, palladium is directly exposed to hydrogen atmosphere. This method has certain safety hazards, and the obtained PdHx product is unstable. Even at room temperature, the hydrogen will completely escape after 12 hours. (NanoRes.2015, 8(8), 2698-2705); 2) The use of toxic hydrogenation reagents such as formaldehyde, N,N-dimethylformamide, n-butylamine will cause environmental and safety problems, and the method is mostly based on two One-step synthesis, the process is relatively cumbersome (J.Am.Chem.Soc.2020, 142(7), 3645-3651; J.Am.Chem.Soc.2015, 137(50), 15672-15675; Nano energy 2018 ,44,127-134); therefore, the development of a simple, efficient, safe and stable preparation method of PdHx nanomaterials is crucial for exploring the influence of non-metallic element hydrogen and its geometric structure on the electronic structure and catalytic performance of catalysts. , the development of efficient and economical palladium-based catalysts has important scientific significance and application value

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