Preparation method of barium sulfate-carbon aerogel composite support supported palladium catalyst

A technology of carbon airgel and composite carrier, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Reduced activity, affecting the industrial application of homogeneous palladium catalysts, etc., to achieve the effects of easy operation, short reaction time, and not easy to condense

Active Publication Date: 2015-07-01
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in homogeneous palladium catalyzed reactions, homogeneous catalysts such as Pd(OAc) 2 and PdCl 2 etc. are easy to produce palladium black in the reaction process, which reduces the catalytic activity, and the catalyst is difficult to separate, recover and reuse from the reaction system. These factors have seriously affected the industrial application of homogeneous palladium catalysts.

Method used

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  • Preparation method of barium sulfate-carbon aerogel composite support supported palladium catalyst
  • Preparation method of barium sulfate-carbon aerogel composite support supported palladium catalyst
  • Preparation method of barium sulfate-carbon aerogel composite support supported palladium catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Dissolve 10g of glucose and 6g of polyvinylpyrrolidone (K30) in 60mL of water, then add 0.3g of Ba(OH) 2 ·8H 2 O, 0.2g potassium sulfate, transfer the mixed solution to a closed reaction kettle, react at 200°C for 5 hours, and obtain a columnar gel after the reaction. figure 1 (a), the gel was freeze-dried and calcined at 550°C for 3 hours under a nitrogen atmosphere to obtain a barium sulfate-carbon airgel composite carrier. The powder diffraction pattern is shown in figure 2 (1), it can be seen from the figure that (1) the peak of barium sulfate appears, and No. 8 has only the carbon peak (without adding Ba(OH) 2 ·8H 2 O and potassium sulfate prepared carbon gels), illustrating that BaSO 4 have been doped into the carbon gel.

Embodiment 2

[0025] Dissolve 5.5g of sucrose and 0.5g of polyacrylamide (Mw: 2000000~14000000) in 20mL of water, then add 0.2g of barium chloride and 0.13g of ammonium sulfate, transfer the mixture to a closed reaction kettle, and react at 200°C After 5 hours, the cylindrical gel was obtained after the reaction. figure 1 (b), after lyophilization, the gel was calcined at 450°C for 2 hours under a nitrogen atmosphere to obtain a barium sulfate-carbon airgel composite carrier, and its powder diffraction pattern is shown in figure 2 (4), it can be seen from the figure that the peak of barium sulfate appears in (4), and there is only a carbon peak in No. 8, indicating that BaSO 4 have been doped into the carbon gel.

Embodiment 3

[0027] Dissolve 5g of lactose and 0.6g of polyacrylamide (Mw: 2000000~14000000) in 15mL of water, then add 10mL of acetic acid, 1.2g of barium nitrate, and 1g of potassium sulfate, transfer the mixture to a closed reaction kettle, and react at 200°C After 5 hours, a cylindrical gel was obtained after the reaction was completed, and the gel was freeze-dried and calcined at 600°C for 4 hours under a nitrogen atmosphere to obtain a barium sulfate-carbon airgel composite carrier.

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Abstract

The invention discloses a preparation method of a barium sulfate-carbon aerogel composite support supported palladium catalyst. The preparation method comprises the following steps: in a closed container, dissolving water-soluble carbohydrate compounds and water-soluble polymers as well as barium hydroxide or soluble barium salt in water; adding sulfuric acid or soluble sulfate to react at 140-300 DEG C; washing and drying to obtain a barium sulfate-carbon aerogel support; and supporting palladium on the barium sulfate-carbon aerogel support to obtain the barium sulfate-carbon aerogel composite support supported palladium catalyst. The barium sulfate-carbon aerogel composite support supported palladium catalyst prepared by the preparation method is good in dispersibility, difficult to condensate, high in stability, strong in catalytic performance and long in service life.

Description

technical field [0001] The invention relates to a preparation method of a palladium catalyst loaded on a barium sulfate-carbon airgel composite carrier. Background technique [0002] As a widely used metal catalyst, palladium catalyst plays an extremely important role in organic synthesis and petrochemical industry. In organic synthesis, because palladium has unfilled 4d orbitals, it can coordinate with various components. By changing the combination of ligands and reactants, it is possible to make many reactions that are not easy to occur smoothly. In addition, the reaction catalyzed by palladium complexes generally has the characteristics of mild reaction conditions, high yield and good selectivity. However, in homogeneous palladium catalyzed reactions, homogeneous catalysts such as Pd(OAc) 2 and PdCl 2 etc. are easy to produce palladium black in the reaction process, which reduces the catalytic activity, and the catalyst is difficult to separate, recover and reuse from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/053B01J23/44C07C15/14C07C1/32
Inventor 梁元通龚德晴党桃桃谢钢杨奇陈三平步怀天王尧宇
Owner NORTHWEST UNIV
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