Preparation of supported platinum nano-cluster catalyst and application of supported platinum nano-cluster catalyst in alkane anaerobic dehydrogenation

A platinum nano-catalyst technology, which is applied in the field of noble metal nano-cluster catalysis, can solve the problems of low substrate conversion rate, easy reaction deactivation of catalyst, and insufficient selectivity of target products, so as to achieve high activity and improve selectivity

Pending Publication Date: 2022-02-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, for the various catalysts commonly used in current research, there are the following problems: (1) low substrate conversion rate; (2) target product selectivity is not high enough; (3) catalysts are prone to reaction deactivation

Method used

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  • Preparation of supported platinum nano-cluster catalyst and application of supported platinum nano-cluster catalyst in alkane anaerobic dehydrogenation
  • Preparation of supported platinum nano-cluster catalyst and application of supported platinum nano-cluster catalyst in alkane anaerobic dehydrogenation
  • Preparation of supported platinum nano-cluster catalyst and application of supported platinum nano-cluster catalyst in alkane anaerobic dehydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Dissolve 50 mg of potassium tetrachloroplatinate in 10 mL of ethanol, and then add 80 mg of triphenylphosphine and 40 mg of a thiol ligand. The above solution was stirred at room temperature for 0.5 hours. Afterwards, the solution was spin-dried, washed with n-hexane, dried in a vacuum oven, and dried at 50° C. for 2 hours; diatomic platinum nanoclusters were obtained. figure 1 It is an electron microscope picture of diatomic platinum, from which we can see diatomic nanoclusters.

[0033] (2) Disperse 5mg of diatomic platinum nanoclusters in dedichloromethane or ethanol, and stir at 20°C for 1h; then add 1g of carrier, continue stirring for 6h, centrifuge, and dry, the drying time is 12h, and the drying temperature is 50°C , to obtain the sample Pt obtained after drying 2 / Al 2 o 3 . 150 mg of catalyst was placed in the reaction tube in 30% by volume H 2 / N 2 atmosphere, pretreatment for 90 minutes under the condition of 550°C.

[0034] (3) The above catalys...

Embodiment 2

[0036] (1) Dissolve 50 mg of potassium tetrachloroplatinate in 20 mL of ethanol, and then add 80 mg of thiol ligand. The above solution was stirred at room temperature for 0.5 hours. Then 20 mg of sodium borohydride dissolved in 4 ml of aqueous solution was added and stirred for 6 hours. Afterwards, the solution was spin-dried, washed by adding n-hexane, and dried in a vacuum oven at a drying temperature of 50° C. and a drying time of 6 hours; polyatomic platinum nanoclusters were obtained.

[0037] (2) Disperse 5mg of polyatomic platinum nanoclusters in dedichloromethane or ethanol, stir at 20°C for 1h; then add 1g of carrier Al 2 o 3 , after continuing to stir for 6 hours, centrifuge and dry, the drying time is 12 hours, and the drying temperature is 50° C. to obtain the sample obtained after drying. The obtained catalyst was calcined at 550 ° C for 2 h in a nitrogen atmosphere to obtain the catalyst Pt 25 / Al 2 o 3 . 150 mg of catalyst Pt 25 / Al 2 o 3 Placed in a ...

Embodiment 3

[0040] (1) The sample dried in step (2) of Example 1 was roasted at 600°C for 2h in a nitrogen atmosphere before pretreatment to obtain the catalyst Pt 2 / Al2 o 3 -N 2 -600. 150 mg of catalyst was placed in the reaction tube in 30% by volume H 2 / N 2 atmosphere, pretreatment for 90 minutes under the condition of 550°C. figure 2 It is an electron microscope picture of platinum nanoclusters. It can be seen from the figure that polyatomic nanoclusters have a size of about 1nm and the number of metal platinum atoms is about 25.

[0041] (2) The above catalyst is at 550°C, nitrogen balance, C 3 h 8 and H 2 The ratio is 1:1, the flow rate is 50ml min -1 Under the conditions of reaction, the reaction time is 2 hours. The conversion of propane was 20%, and the selectivity to propylene was 93%.

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Abstract

The invention provides an application of a supported platinum nano-cluster catalyst in an alkane anaerobic dehydrogenation reaction. The catalyst takes an oxide as a carrier and platinum nano-clusters as an active component, the platinum nano-clusters are monodispersed on the oxide carrier, and the platinum nano-clusters are composed of ligands and platinum atoms; the ligand is at least one of organic phosphorus and mercaptan; the platinum atoms are diatoms or polyatoms. The preparation method of the catalyst comprises the following steps: (1) preparing a diatomic or polyatomic platinum nano-cluster; (2) loading the diatomic or polyatomic platinum nano-cluster on the carrier; and (3) post-treatment of the catalyst. The catalyst prepared by the method has high-dispersion nanoscale platinum nano-clusters, and has high selectivity to olefin in the anaerobic dehydrogenation reaction of alkane such as propane and the like.

Description

technical field [0001] The invention belongs to the field of noble metal nano-cluster catalysis, and in particular relates to a preparation method of a supported double-atom and multi-atom platinum nano-cluster catalyst and its application in alkane oxygen-free dehydrogenation. [0002] technical background [0003] As an important raw material of organic monomers, olefins, such as ethylene, propylene and styrene, are widely used in the synthesis of various plastics, resins and rubbers, and are closely related to human life and production. Platinum-based nanoparticle catalyst is a catalyst widely used in the dehydrogenation of alkanes. Due to the relatively low conversion and selectivity of target products, the low utilization of platinum atoms and other issues. Therefore, the development of a platinum catalyst with high dispersion, high stability, and high active sites is the key to catalyzing the dehydrogenation of alkanes to alkenes. Liu et al. added ZnO to Pt / Al 2 o 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/24B01J23/42B01J35/00C07C5/333C07C11/06
CPCB01J31/2404B01J23/42B01J35/0013B01J35/006C07C5/3337B01J2531/828B01J2531/0238B01J2231/766C07C2531/24C07C2523/42C07C11/06Y02P20/52
Inventor 黄家辉刘超唐杰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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