Temperature sensitive graphene-based gold-platinum core-shell bimetallic catalyst and preparation method thereof

A bimetallic catalyst, graphene technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., to reduce mass transfer resistance, the preparation method process is simple, repeatable good usability

Inactive Publication Date: 2015-08-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in heterogeneous catalytic reactions, it is still a great challenge to control the catalyst activity by reaction temperature.

Method used

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  • Temperature sensitive graphene-based gold-platinum core-shell bimetallic catalyst and preparation method thereof
  • Temperature sensitive graphene-based gold-platinum core-shell bimetallic catalyst and preparation method thereof

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preparation example Construction

[0024] The preparation method of thermosensitive type graphene foundation-platinum core-shell bimetallic catalyst of the present invention comprises the steps:

[0025] 1) Take a chemically reduced graphene aqueous solution with a concentration of 0.8-1.5mg / mL, add an aqueous solution of chloroauric acid with a concentration of 8-12mmol / L according to the mass ratio of graphene to gold ions of 1:0.07-0.258, and stir and mix for 30- After 120 minutes, heat up to 80-100°C, then add sodium citrate aqueous solution with a concentration of 8-12mmol / L to the mixed solution at a ratio of 1:1-2 molar ratio of gold ions to sodium citrate, and react for 30-120 minutes. Then add 8-12mmol / L silver nitrate aqueous solution according to the molar ratio of chloroauric acid to silver nitrate 1:0.67-1.5, react for 30-120min, then press the molar ratio of silver nitrate to potassium tetrachloroplatinite 1:1 Add an aqueous solution of potassium tetrachloroplatinite with a concentration of 8-12mm...

Embodiment 1

[0030] (1) Take 30mL of chemically reduced graphene with a concentration of 1mg / mL and add it to the reaction vessel, add 3.3mL of chloroauric acid solution with a concentration of 10mmol / L, heat the reaction vessel to 80°C, and then add 6.6mL with a concentration of 10mmol / L L of sodium citrate aqueous solution, keep this temperature for 60min, then add dropwise 3.3mL silver nitrate solution with a concentration of 10mmol / L to the solution, keep it at 80°C for 60min, then add 3.3mL with a concentration of 10mmol / L dropwise to the solution The aqueous solution of potassium tetrachloroplatinite was kept at 80°C for 3 hours, and then the product was centrifuged and washed until the supernatant pH = 7, and the precipitate was freeze-dried at -50°C to obtain a temperature-sensitive graphene-platinum core-shell double Metal catalyst precursor, its TEM characterization results are as follows figure 1 shown.

[0031] (2) Dissolve 25mg of polyisopropylacrylamide-grafted dextran in 5m...

Embodiment 2

[0035] (1) Take 50mL of chemically reduced graphene with a concentration of 0.8mg / mL and add it to the reaction vessel, add 1.8mL of chloroauric acid solution with a concentration of 8mmol / L, heat the reaction vessel to 90°C, and then add 3.6mL with a concentration of 8mmol / L of sodium citrate aqueous solution, keep this temperature for 120min, then dropwise add 2.7mL of silver nitrate solution with a concentration of 8mmol / L to the solution, keep the reaction at 90°C for 60min, then add 2.7mL of silver nitrate solution with a concentration of 8mmol / L dropwise to the solution L of potassium tetrachloroplatinite aqueous solution was kept at 90°C for 1.5h to complete the reaction, and then the product was centrifuged and washed until the supernatant pH = 6.8, and the precipitate was freeze-dried at -50°C to obtain a temperature-sensitive graphene-platinum core Shell bimetallic catalyst precursors.

[0036] (2) Dissolve 30 mg of polyisopropylacrylamide grafted dextran in 7.5 mL ...

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Abstract

The invention relates to a temperature sensitive graphene-based gold-platinum core-shell bimetallic catalyst and a preparation method thereof. The catalyst is characterized in that a gold-platinum core-shell structured bimetallic nanoparticle with the particle size of 35-50nm is supported on a graphene carrier as an active site, sulfhydrylated polyisopropyl acrylamide grafted glucan is coated on the gold-platinum core-shell structured bimetallic nanoparticle as a temperature stimulation response factor, the catalyst concretely comprises 28-42.5wt% of graphene, 2.4-9wt% of gold, 2.4-9wt% of platinum, and 50-60wt% of the sulfhydrylated polyisopropyl acrylamide grafted glucan, and the sum mass percentages of all components is 100%. The method comprises the following steps: preparing a temperature sensitive graphene-based gold-platinum core-shell bimetallic catalyst precursor; preparing an aqueous solution of polyisopropyl acrylamide grafted glucan; and preparing the temperature sensitive graphene-based gold-platinum core-shell bimetallic catalyst. The catalyst has the advantages of high catalysis activity, good reusability, and realization of temperature control of the catalysis activity.

Description

technical field [0001] The present invention relates to a catalyst. In particular, it relates to a temperature-sensitive graphene-based-platinum core-shell bimetallic catalyst and a preparation method thereof. Background technique [0002] Graphene has a very large specific surface area and is an ideal catalyst support for heterogeneous reactions. Graphene is used as a catalyst carrier, and reactants and products can easily enter or leave the graphene surface, reducing mass transfer resistance. At present, catalysts using metals such as palladium, gold, platinum, and silver as active sites and graphene as a catalyst carrier have been successfully prepared, and have shown high catalytic activity and good reusability. Scheuermann et al Dispersed oxidation with ethanol in Palladium Nanoparticles on Graphite Oxide and Its Functionalized Graphene Derivatives as Highly Active Catalysts for the Suzuki-Miyaura Coupling Reaction, J.Am.Chem.Soc., 2009,131(23):8262-8270 Graphene, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06B01J23/52B01J35/08B82Y30/00B82Y40/00
Inventor 范晓彬齐俊杰朱远蹠张国亮张凤宝
Owner TIANJIN UNIV
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