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Preparation method of Pt monatomic catalyst supported by Al and hydrothermal modified sepiolite group minerals

A hydrothermal modification and catalyst technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. Poor stability and stability, etc., to achieve the effect of improving atom utilization, improving efficiency, and reducing dosage

Pending Publication Date: 2022-03-15
HEBEI UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention not only overcomes the disadvantages of low atom utilization rate, poor selectivity and stability of the traditional Pt catalyst, but also overcomes the disadvantages of complex preparation and processing technology and high cost of the single-atom catalyst carrier

Method used

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  • Preparation method of Pt monatomic catalyst supported by Al and hydrothermal modified sepiolite group minerals
  • Preparation method of Pt monatomic catalyst supported by Al and hydrothermal modified sepiolite group minerals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 600mg of sepiolite nanofiber powder (100 mesh) and immerse in 100ml of 6mol / L sodium hydroxide solution, and add 20mg of sodium metaaluminate, then place the mixed solution in a shaker and vibrate at room temperature for 6h; then mix The solution was transferred to an oil bath, condensed and refluxed at 90°C and stirred for 4 hours, then the mineral powder was separated and washed until no Al was leached, and dried in an oven at 80°C; measure 99ml of deionized water into a beaker, and add 1ml 0.025mmol / ml chloroplatinic acid solution, after stirring for 15min, add 500mg treated sepiolite nanofiber powder, stir at a speed of 700rpm / min for 1h and ultrasonic for 1h, age at room temperature for 2h, then suction filter and wash, And drying at 80° C. for 12 hours to prepare the precursor. Put the precursor into a quartz boat, put it into a tube atmosphere furnace, and pass through 5% H 2+95%N 2 (Volume ratio) mixed gas, the heating rate is 5°C / min to 400°C, heat pres...

Embodiment 2

[0035] Other steps are the same as in Example 1, except that "add 1ml of 0.025mmol / ml chloroplatinic acid solution" is replaced with "add 1ml of 0.1mmol / ml chloroplatinic acid solution".

[0036] The single-atom Pt / sepiolite nanofiber catalyst with higher loading was obtained, indicating that the sepiolite channel has a good confinement effect, and increasing the concentration of chloroplatinic acid solution will not make Pt grow into Pt particles.

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Abstract

The invention relates to a preparation method of a Pt monatomic catalyst loaded with sepiolite group minerals subjected to Al combined hydrothermal modification. According to the method, sepiolite group minerals are modified through Al in combination with a hydrothermal method, then aluminum salt is added, on the premise that pore channels are not blocked, Al < 3 + > with the high ion exchange capacity replaces part of Mg < 2 + > with the low ion exchange capacity, and therefore the ion exchange efficiency of the sepiolite group minerals is improved, meanwhile, the content of Al < 3 + > is increased, and the surface isoelectric point of sepiolite is increased; and heating and stirring are combined to jointly promote Pt-containing anion groups with large radiuses to enter pore channels of sepiolite group minerals through ion exchange, and the sizes of the pore channels control the growth sizes of the exchanged Pt-containing ion groups in the reduction process, so that Pt stably exists in a monatomic form. According to the invention, not only are the defects of low atom utilization rate, poor selectivity and poor stability of a traditional Pt catalyst overcome, but also the defects of complex preparation and processing technology and high cost of a monatomic catalyst carrier are overcome.

Description

technical field [0001] The technical solution of the invention relates to the field of catalyst synthesis, in particular to a preparation method of sepiolite mineral-supported Pt single-atom catalysts. Background technique [0002] Pt is a classic noble metal catalyst. Due to its unique electronic structure, it has extremely high activity in electrocatalysis, which has attracted much attention and attracted extensive research by scholars all over the world. On the other hand, due to its resource It has been criticized for being scarce and expensive. At present, commercial Pt / C catalysts have low activity, poor stability, and are easy to deactivate. Scholars have molded them into nanowires and nanoparticles, which can improve the atom utilization efficiency and catalytic performance to a certain extent, but it is far to less than 100% atomic utilization. When Pt participates in the catalytic reaction in the form of a single atom, the theoretical atomic utilization rate of P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J37/10B01J37/30B01J37/02B01J37/18
CPCB01J23/42B01J37/10B01J37/30B01J37/0207B01J37/18B01J35/23B01J35/399
Inventor 王菲郝铭梁金生王东旭王玉磊
Owner HEBEI UNIV OF TECH
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