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Palladium nanoparticle supported layered double hydroxide nano-composite material, preparation method thereof, and ammonia borane catalytic decomposition method

A nanocomposite, double hydroxide technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, catalyst activation/preparation, etc. activity, etc.

Active Publication Date: 2018-01-19
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the catalysts that are used for the decomposition of ammonia borane include: platinum, ruthenium, noble metal catalysts such as rhodium nanoparticles and copper, non-noble metal catalysts such as nickel nanoparticles, although these catalysts can play the role of catalyzing the decomposition of ammonia borane, but There are the following defects: (1) the precious metals are limited in storage and expensive, which limits their application in actual production; (2) single metal nanoparticles are prone to aggregation, which will affect the catalytic activity

Method used

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  • Palladium nanoparticle supported layered double hydroxide nano-composite material, preparation method thereof, and ammonia borane catalytic decomposition method
  • Palladium nanoparticle supported layered double hydroxide nano-composite material, preparation method thereof, and ammonia borane catalytic decomposition method
  • Palladium nanoparticle supported layered double hydroxide nano-composite material, preparation method thereof, and ammonia borane catalytic decomposition method

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preparation example Construction

[0028] The invention provides a preparation method of a palladium nanoparticle-supported layered double hydroxide nanocomposite material, the preparation method comprising:

[0029] 1) Carrying out coordination polymerization reaction of cobalt source, 2-methylimidazole, surfactant and water to prepare coordination polymer ZIF-67;

[0030] 2) Contact reaction of coordination polymer ZIF-67 and nickel in an organic solvent to prepare NiCo LDH (nickel-cobalt layered double hydroxide);

[0031] 3) Disperse the palladium source and NiCo LDH in water, then adjust the pH of the system to 9.5-10.5, and then perform a hydrothermal reaction to prepare a nanocomposite material of palladium nanoparticle-loaded layered double hydroxide.

[0032] In step 1) of the above-mentioned preparation method, the consumption of each material can be selected in a wide range, but in order to make the nanocomposite material have more excellent catalytic properties, preferably, in step 1), relative to 1...

Embodiment 1

[0052] 1) Dissolve 908mg of 2-methylimidazole in 14mL of ultrapure water and stir for 10min, then quickly pour 2mL of aqueous solution (containing 1mg of CTAB and 58mg of cobalt nitrate) into the solution, continue stirring for 20min to obtain a purple suspension, and finally centrifuge with absolute ethanol and dried to obtain ZIF-67 purple powder.

[0053] 2) Disperse 30mg of ZIF-67 powder with 20mg of absolute ethanol, then weigh 100mg of nickel nitrate and add it and heat it under reflux at 85°C until the purple color of the system fades, centrifuge and dry to obtain NiCo LDH green powder.

[0054] 3) Disperse 20 mg of NiCo LDH powder with 5 mL of water to form a green suspension, add 5 mL of 0.1 mol / L sodium tetrachloropalladate aqueous solution, adjust the pH to 10 with 0.1 mol / L NaOH solution and stir for 30 min, transfer the mixed solution to Put in a 20mL polytetrafluoroethylene kettle and react at 100°C for 10h, cool to 25°C, and centrifugally dry to obtain 0.0025mol...

Embodiment 4

[0060] The Pd / LDH was prepared according to the method of Example 1, except that in step 3), the hydrothermal reaction met the following conditions: the reaction temperature was 150°C, and the reaction time was 4h.

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Abstract

The invention discloses a palladium nanoparticle supported layered double hydroxide nano-composite material, a preparation method thereof, and an ammonia borane catalytic decomposition method. The preparation method comprises the following steps: 1, carrying out a coordination polymerization reaction on a cobalt source, 2-methylimidazole, a surfactant and water to prepare a coordination polymer ZIF-67; 2, carrying out a contact reaction on the coordination polymer ZIF-67 and a nickel source in an organic solvent to prepare NiCo LDH; and 3, dispersing a palladium source and the NiCo LDH in water, adjusting the pH value of the obtained system to 9.5-10.5, and carrying out a hydrothermal reaction to prepare the palladium nanoparticle supported layered double hydroxide nano-composite material.The palladium nanoparticle supported layered double hydroxide nano-composite material prepared through the method has an excellent catalysis performance, so the nano-composite material is suitable for catalytic decomposition of ammonia borane; and the preparation method has the advantages of simple steps, mild and controllable conditions, and friendliness to the environment.

Description

technical field [0001] The invention relates to a nanocomposite material, in particular to a palladium nanoparticle-loaded layered double hydroxide nanocomposite material, a preparation method thereof, and an ammonia borane catalytic decomposition method. Background technique [0002] With the development of population and economy, people's demand for high-efficiency energy is increasing. Traditional energy sources such as coal mines, oil, and natural gas are non-renewable, and the combustion products pollute the environment. Therefore, the development of new energy sources has become the primary issue of world development. As a new energy source, hydrogen has a combustion enthalpy of 120mJ kg -1 , is three times that of oil. The combustion product of hydrogen is water, which is the cleanest energy source. However, the most important factor restricting the application of hydrogen energy is the storage and transportation of hydrogen. As one of the hydrogen storage materia...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J37/10B82Y30/00B82Y40/00C01B3/06
CPCY02E60/36
Inventor 周映华王苏琴张志严
Owner ANHUI NORMAL UNIV
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