Metal organic skeleton structure material load platinum catalyst, as well as preparation method and application thereof

[0026] Example 1

[0027] Cr(NO 3 ) 3 ·9H 2 O, HF, terephthalic acid and deionized water are reacted in a hydrothermal reactor at a constant temperature of 493K for 8 hours at a molar ratio of 1:1:1:265; naturally cooled to room temperature and filtered to obtain a green solid powder; Then the solid powder is washed with an organic solvent and a small molecular alcohol, and filtered while it is hot after each wash. Finally, the MIL-101 powder obtained by drying in a constant temperature drying oven is the metal organic framework structure material MIL-101. Put 0.5mL H 2 PtCl 6 Ethanol solution (1g chloroplatinic acid hexahydrate dissolved in ethanol to prepare 25mL solution) was added dropwise to 1.500g of the MIL-101 powder prepared above, then 10-12mL of ethanol, stirring and immersion at room temperature for 4-6 hours at a stirring speed of about 600 Revolutions per minute. After the immersion, the solvent is evaporated and dried at 353-393K. Then add an appropriate amount of sodium formate and deionized water according to the molar ratio of platinum and sodium formate of 1:10, and reduce at 368K for 2 hours. After cooling, wash with a large amount of deionized water to remove the chloride ions, and then dry at 353-393K. The prepared load is 0.5wt.% Pt/MIL-101 catalyst.

[0028] Example 2

[0029] In this example, a Pt/MIL-101 catalyst with a Pt loading of 5 wt.% was prepared according to the preferred conditions:

[0030] The preparation method of the metal organic framework structure material MIL-101 is basically the same as that of Example 1. Put 2.0mL H 2 PtCl 6 Ethanol solution (1g chloroplatinic acid hexahydrate is dissolved in ethanol to prepare 25mL chloroplatinic acid ethanol solution) is added dropwise to 573.4mg MIL-101 powder, and then 5-8mL ethanol, stirring and immersion at room temperature for 4-6 hours, stirring speed is about It is 600 revolutions per minute. After the immersion, the solvent is evaporated and dried at 353-393K. Then add an appropriate amount of sodium formate and deionized water at a molar ratio of platinum to sodium formate of 1:10, and reduce at 368K for 2 hours. After cooling, wash with a large amount of deionized water to remove the chloride ions, and then dry at 353-393K to obtain a load of 5wt .% Pt/MIL-101 catalyst.

[0031] figure 1 XRD patterns of the carrier MIL-101 prepared in Example 1 and the 5 wt.% Pt/MIL-101 catalyst prepared in Example 2. From figure 1 It can be seen that the structure of the carrier after loading Pt is complete, and the crystal phase peak of metal Pt is not observed, indicating that platinum nanoparticles are highly dispersed on the carrier as an active component.

[0032] figure 2 It is a TEM (transmission electron microscope) photo of the 5wt.%Pt/MIL-101 catalyst prepared in Example 2. It can be seen that the platinum particles are uniformly dispersed on the carrier MIL-101, and the particle size is uniform, with an average particle size of 1.8nm. The degree of dispersion is 61.1%.

[0033] image 3 N for the carrier MIL-101 prepared in Example 1 and the 5wt.% Pt/MIL-101 catalyst prepared in Example 2 2 Adsorption and desorption curve diagram and BJH pore size distribution diagram. image 3 It can be seen that, compared with the support, the catalyst loaded with Pt still maintains a higher BET specific surface area.

[0034] Example 3

[0035] The preparation method of the metal organic framework structure material MIL-101 is basically the same as that of Example 1. Put 3.0mL H 2 PtCl 6 Ethanol solution (1g chloroplatinic acid hexahydrate dissolved in ethanol to prepare 25mL chloroplatinic acid ethanol solution) was added dropwise to 407mg MIL-101 powder, then 4-7mL ethanol, stirring and immersion at room temperature for 4-6 hours, the stirring speed was about 600 revolutions per minute. After the immersion, the solvent is evaporated and dried at 353-393K. Then add an appropriate amount of sodium formate and deionized water at a molar ratio of platinum and sodium formate of 1:10, and reduce at 368K for 2h. After cooling, wash with a large amount of deionized water to remove the chloride ions, and then dry at 353-393K to obtain a load of 10wt. % Pt/MIL-101 catalyst.