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Preparation method and application of Pd-based catalyst

A catalyst, supported catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of difficult control of experimental conditions and low experimental reproducibility question

Pending Publication Date: 2021-11-05
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Noble metal nanoparticles with specific morphology can improve their catalytic performance, but the morphology-controlled synthesis of nanoparticles is affected by many factors, such as pH value, temperature, solvent, concentration, pressure, molar ratio of reactants, Heating rate, cooling rate, reaction raw materials, etc., the experimental conditions are not easy to control, the experimental reproducibility is not high, and there are still some problems to be solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Configuration solution: 0.1mol / L AA solution, 0.1mol / L CTAB solution, 0.01mol / L Na 2 PdCl 4 Solution, 0.1mg / ml potassium dichromate solution, 0.05mg / ml potassium dichromate solution, acetic acid-sodium acetate buffer solution with pH 3.60.

[0018] Take 20mL of deionized water in a 100mL flask, add 5mL of 0.01mol / L Na 2 PdC1 4 Solution and 0.5ml of 0.1mol / L CTAB solution were uniformly mixed for 10min under magnetic stirring, and preheated to 60°C. Then add 2.5ml of 0.1mol / L AA solution, after the reduction reaction for 5min, centrifuge the resulting solution (11000rpm, 15min), wash with absolute ethanol and deionized water three times alternately, to obtain Pd nanoparticles, and the obtained nanoparticles Ultrasonic dispersion in 8 mL of absolute ethanol, followed by the addition of Pd nanoparticles dispersed in absolute ethanol in the presence of 0.1 g Al 2 o 3 Put the carrier in a 50ml beaker, stir at room temperature for 15h, then wash and separate with acetone...

Embodiment 2

[0021] Take 20mL of deionized water in a 100mL flask, add 5mL of 0.01mol / L Na 2 PdC1 4 Solution and 0.5ml of 0.1mol / L CTAB solution were uniformly mixed for 10min under magnetic stirring, and preheated to 60°C. Then add 2.5ml of 0.1mol / L AA solution, after the reduction reaction for 5min, centrifuge the resulting solution (11000rpm, 15min), wash with absolute ethanol and deionized water three times alternately, to obtain Pd nanoparticles, and the obtained nanoparticles Ultrasonic dispersion in 8 mL of absolute ethanol, followed by adding Pd nanoparticles dispersed in absolute ethanol to 0.5312 g of Al 2 o 3 Put the carrier in a 50ml beaker, stir at room temperature for 15h, then wash and separate with acetone three times, and dry at 180°C for 3h to obtain a Pd / Al with a theoretical loading of 1wt%. 2 o 3 catalyst.

[0022] The prepared Pd-based catalyst is used for the catalytic reduction of Cr(VI). Take 40ml of prepared potassium dichromate solution, add 10ml of acetic a...

Embodiment 3

[0024] Take 20mL of deionized water in a 100mL flask, add 5mL of 0.01mol / L Na 2 PdC1 4 Solution and 0.5ml of 0.1mol / L CTAB solution were uniformly mixed for 10min under magnetic stirring, and preheated to 60°C. Then add 2.5ml of 0.1mol / L AA solution, after the reduction reaction for 5min, centrifuge the resulting solution (11000rpm, 15min), wash with absolute ethanol and deionized water three times alternately, to obtain Pd nanoparticles, and the obtained nanoparticles Ultrasonic dispersion in 8 mL of absolute ethanol, followed by adding Pd nanoparticles dispersed in absolute ethanol to 0.2656 g of Al 2 o 3 Put the carrier in a 50ml beaker, stir at room temperature for 15h, then wash and separate with acetone three times, and dry at 180°C for 3h to obtain a Pd / Al with a theoretical loading of 2wt%. 2 o 3 catalyst.

[0025] The prepared Pd-based catalyst is used for the catalytic reduction of Cr(VI). Take 40ml of prepared potassium dichromate solution, add 10ml of acetic a...

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Abstract

The invention relates to a preparation method of a catalyst containing Pd nanoparticles and application of the catalyst in catalytic hydrogenation reduction of Cr < 6 + > in water. According to the method, cetyltrimethylammonium bromide (CTAB) is used as a protective agent, Na2PdCl4 is used as a precursor, ascorbic acid (AA) is used as a reducing agent, palladium nano-particles are prepared under the dynamic control condition, the palladium nano-particles are loaded on an Al2O3 carrier calcined at 600 DEG C, different dynamic control preparation conditions are investigated, and in other words, the influence of the reaction temperature, the reaction time and the use amount of CTAB on the structure and the morphology of the loaded Pd nano-particles is investigated. And then the catalyst is applied to catalytic reduction degradation of pollutants Cr < 6 + > in water. The catalyst is relatively simple in preparation process, has relatively strong catalytic hydrogenation performance, and can be applied to catalysis in the aspects of catalytic reduction of hexavalent chromium, phenol hydrogenation reaction, emission of automobile exhaust, catalytic cracking of petroleum and the like.

Description

technical field [0001] The invention belongs to the field of catalytic materials, and in particular relates to a preparation method of a Pd-based catalyst and its application in catalytic hydrogenation and reduction of Cr(VI) in water. Background technique [0002] Palladium nanomaterials have quantum size effect, volume effect, surface effect and macroscopic quantum tunneling effect, etc. [0003] Therefore, it has unique optical, electrical, catalytic properties, phase transition and particle transport properties. [0004] Palladium nanomaterials are used in automobile exhaust gas treatment, hydrogen storage materials, fuel cell catalytic electrodes and organic and inorganic catalysis [0005] Pd nanomaterials have high catalytic activity, so they are widely used as catalysts in fuel cells, sensors, petroleum cracking, tail gas treatment and other fields. [0006] Since Pd metal is relatively expensive and rare, it is particularly important to reduce the amount of Pd by ...

Claims

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Application Information

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IPC IPC(8): B01J23/44C02F1/70C02F101/22
CPCB01J23/44C02F1/70C02F1/705C02F2101/22
Inventor 韩玉香侯兴顺杨晓丹陶仁梅
Owner CHANGCHUN UNIV OF TECH
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