Preparation method of MOFs nano material supporting nano metal particles

A technology of nano metal particles and nano materials, applied in the field of preparation of MOFs nano materials, can solve the problems of reduced catalytic activity, easy agglomeration of nanoparticles, hindered mass transfer process, etc., to improve stability and selectivity, and mild and controllable conditions. , the effect of cheap and easy-to-obtain raw materials

Active Publication Date: 2018-06-01
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0003] At present, the reported composite structures of metal nanoparticles and MOFs include core-shell structure, mosaic structure, etc., but the molecule used in these synthetic materials is terephthalic acid, and the stability of the obtained catalyst is not enough.
ZIF series materials, especially ZIF-8, have high structural stability, and it is of great significance to use them in the synthesis of metal MOFs composite materials. However, most of the metal and ZIF-8 composite structures reported so far are mosaic structures. As well as the core-she

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  • Preparation method of MOFs nano material supporting nano metal particles
  • Preparation method of MOFs nano material supporting nano metal particles

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Embodiment 1

[0023] Mix 40mL of zinc nitrate methanol solution with a concentration of 0.025mol / L and 40mL of 2-methylimidazole methanol solution with a concentration of 0.1mol / L, mix and stir evenly, let stand at room temperature for 12h, wash with ethanol and dry by centrifugation. Disperse the solid powder obtained in the previous step in 10 mL of methanol solution, add 2.5 mL of 2-methylimidazole methanol solution with a concentration of 0.8 mol / L containing Pt nanoparticles and 2.5 mL of cobalt nitrate methanol solution with a concentration of 0.05 mol / L, and mix After stirring evenly, react at 100° C. for 12 h, wash with ethanol and dry by centrifugation. Disperse the solid powder obtained in the previous step in 15 mL of methanol solution, add 2.5 mL of 2-methylimidazole methanol solution with a concentration of 0.02 mol / L and 2.5 mL of zinc nitrate methanol solution with a concentration of 0.01 mol / L, mix and stir evenly After reacting at 105° C. for 6 h, wash with ethanol and cent...

Embodiment 2

[0027] Mix 40 mL of zinc nitrate methanol solution with a concentration of 0.035 mol / L and 40 mL of 2-methylimidazole methanol solution with a concentration of 0.1 mol / L, stir evenly, let stand at room temperature for 12 h, wash with ethanol and dry by centrifugation. Disperse the solid powder obtained in the previous step in 10 mL of methanol solution, add 2.5 mL of 2-methylimidazole methanol solution containing Pt nanoparticles at a concentration of 0.8 mol / L and 2.5 mL of cobalt nitrate methanol solution with a concentration of 0.2 mol / L, and mix After stirring evenly, react at 100° C. for 12 h, wash with ethanol and dry by centrifugation. Disperse the solid powder obtained in the previous step in 15 mL of methanol solution, add 2.5 mL of 2-methylimidazole methanol solution with a concentration of 0.02 mol / L and 2.5 mL of zinc nitrate methanol solution with a concentration of 0.03 mol / L, mix and stir evenly After reacting at 105° C. for 4 h, wash with ethanol and centrifuga...

Embodiment 3

[0030] Mix 40 mL of zinc nitrate methanol solution with a concentration of 0.045 mol / L and 40 mL of 2-methylimidazole methanol solution with a concentration of 0.1 mol / L, mix and stir evenly, let stand at room temperature for 12 hours, wash with ethanol and dry by centrifugation. Disperse the solid powder obtained in the previous step in 10 mL of methanol solution, add 2.5 mL of 2-methylimidazole methanol solution with a concentration of 0.8 mol / L containing Pt nanoparticles and 2.5 mL of cobalt nitrate methanol solution with a concentration of 0.1 mol / L, and mix After stirring evenly, react at 100° C. for 12 h, wash with ethanol and dry by centrifugation. Disperse the solid powder obtained in the previous step in 15 mL of methanol solution, add 2.5 mL of 2-methylimidazole methanol solution with a concentration of 0.02 mol / L and 2.5 mL of zinc nitrate methanol solution with a concentration of 0.02 mol / L, mix and stir evenly After reacting at 100° C. for 8 h, wash with ethanol ...

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Abstract

The invention provides a preparation method of a MOFs nano material supporting nano metal particles. The method comprises the following steps: step 1: uniformly mixing a 2-methylimidazole methanol solution and a zinc nitrate methanol solution, and carrying out standing to obtain ZIF-8 particles with uniform distribution of particle diameters; step 2: dispersing the ZIF-8 in a methanol solution containing cobalt nitrate, 2-methylimidazole and metal nano particles, carrying out ultrasonic treatment and uniform stirring, and carrying out a reaction to obtain purple solid powder; and step 3: dispersing the purple solid powder in a methanol solution of zinc nitrate and 2-methylimidazole, carrying out ultrasonic treatment and uniform stirring, carrying out a reaction, and carrying out washing and drying after the reaction is finished, so as to obtain the MOFs nano material supporting nano metal particles with a sandwich structure. The preparation method has cheap and easily obtained raw materials, mild and controllable conditions, and no pollution to the environment; the synthesized MOFs nano material supporting metal nano particles has a sandwich structure, and the supported metal is uniformly dispersed in the interlayer, so that the stability and selectivity of the catalyst are improved.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical synthesis, and in particular relates to a preparation method of MOFs nanometer material loaded with nanometer metal particles. Background technique [0002] In recent years, metal organic frameworks (MOFs, metal organic frameworks) have attracted much attention due to their unique properties in gas storage and separation. Combined with the high activity of nano-metal catalysis and the high specific surface area, developed pore structure and special coordination environment of MOFs, the synthesis and preparation of composite materials of nano-metal particles and MOFs has become a current research hotspot. [0003] At present, the reported composite structures of metal nanoparticles and MOFs include core-shell structure, mosaic structure, etc., but the molecules used in these synthetic materials are terephthalic acid, and the resulting catalysts are not stable enough. ZIF series material...

Claims

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Application Information

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IPC IPC(8): B01J31/22B01J35/02
CPCB01J31/1691B01J35/0013B01J35/006B01J35/0093B01J35/026B01J2531/26B01J2531/845
Inventor 李福伟赵泽伦夏春谷孙鹏司家奇高广杨莉
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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