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Preparation method of freeze-dried modified sepiolite mineral loaded Pd monatomic catalyst

A catalyst and drying technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the complex preparation and processing technology, selectivity and stability of single-atom catalyst carrier Poor performance, low atom utilization rate, etc., to achieve the effect of improving atom utilization rate, good tolerance, and fewer steps

Pending Publication Date: 2022-03-11
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention not only overcomes the low utilization rate of traditional Pd catalyst atoms, poor selectivity and stability, 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 freeze-dried modified sepiolite mineral loaded Pd monatomic catalyst
  • Preparation method of freeze-dried modified sepiolite mineral loaded Pd monatomic catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 600 mg of sepiolite nanofiber powder (100 mesh) and immerse in 100 ml of deionized water, centrifuge the mixture after ultrasonication for 2 h and discard the supernatant; place the centrifuged solid in a refrigerator at -18°C for 24 h, then place It was transferred to a vacuum freeze dryer, and was freeze-dried at -50°C for 48 hours in a vacuum state. After drying, it was transferred to a vacuum dryer for use; 0.025 mmol of palladium chloride was added to 100 ml of 0.5 mmol / L chloride The sodium solution was stirred for 4 hours, and then 500 mg of treated sepiolite nanofiber powder was added, and then the mixture was transferred to a water bath at 80°C under condensing reflux and continued to stir at a speed of 700 rpm / min for 1 hour, then aged at room temperature for 2 hours, Afterwards, the mixed solution was suction-filtered, washed, and dried at 80° C. for 12 hours to obtain a precursor. Put the precursor into a quartz boat, put it into a tube atmosphere furn...

Embodiment 2

[0037] Other steps are the same as in Example 1, except that "0.025mmol palladium chloride is added to 100ml 0.5mmol / L sodium chloride solution" is replaced by "0.1mmol palladium chloride is added to 100ml 2mmol / L sodium chloride solution".

[0038] The single-atom Pd / sepiolite nanofiber catalyst with higher loading was obtained, indicating that the sepiolite channel has a good confinement effect, and increasing the concentration of palladium chloride solution will not make Pd grow into Pd particles.

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Abstract

The invention relates to a preparation method of a freeze-dried modified sepiolite mineral loaded Pd monatomic catalyst. According to the method, the sepiolite group minerals are treated by combining ultrasonic treatment with freeze drying, firstly, the sepiolite group minerals are preliminarily dispersed through ultrasonic treatment, then, the sepiolite group minerals are further unbundled in the freeze drying process, more ion exchange sites are exposed out of the sepiolite group minerals, meanwhile, zeolite water in pore channels is removed through freeze drying, and the sepiolite group minerals are separated from the pore channels. The pore channel of the mineral is dredged, so that the ion exchange efficiency of the mineral is improved, the Pd is promoted to enter the pore channel through ion exchange, and the size of the pore channel controls the growth size of the exchanged Pd in the reduction process, so that the Pd stably exists in a monatomic form. According to the invention, the defects of low atom utilization rate and poor selectivity and stability of the traditional Pd catalyst are overcome, and 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 present invention relates to the field of catalyst synthesis, in particular to a preparation method of a sepiolite mineral-supported Pd single-atom catalyst. Background technique [0002] Catalysts play an important role in the modern chemical industry. Catalysts are used in more than 90% of industrial processes, such as chemical, petrochemical, biochemical, and environmental protection. Among them, Pd, as a common noble metal catalyst, has relatively excellent catalytic activity and product selectivity, and is widely used in photocatalysis, electrocatalysis, hydrogenation catalysis and other fields. [0003] Pd has shown good application prospects in the field of catalysis, but its low atomic utilization and high price still greatly limit its industrial application. The atom utilization efficiency in Pd single-atom catalysts can theoretically reach 100%, and the single active site and strong interaction with the support...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/58B01J37/34B01J37/32
CPCB01J23/58B01J37/343B01J37/32
Inventor 王菲王玉磊梁金生郝铭王东旭
Owner HEBEI UNIV OF TECH
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