Supported molybdenum carbide/metal nanoparticle composite catalyst and its preparation method and application in catalytic degradation of heavy metal chromium

A technology of metal nanoparticles and composite catalysts, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., and can solve problems such as poor stability, easy sintering and agglomeration of molybdenum carbide, and secondary pollution , to achieve the effect of increasing surface catalytic active sites, improving overall performance, and accelerating proton transfer

Inactive Publication Date: 2018-07-24
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the technical problems to be solved by the present invention is to avoid problems such as easy sintering and agglomeration of molybdenum carbide in high-temperature synthesis, poor compatibility between molybdenum carbide nanoparticles and carrier precursors, poor performance of composite catalysts, and poor stability. The second technical problem to be solved by the present invention is to solve difficult problems such as difficult to effectively degrade hexavalent chromium or easily cause secondary pollution by using traditional methods, and provide theoretical guidance and technical support for the treatment of actual chromium-containing wastewater

Method used

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  • Supported molybdenum carbide/metal nanoparticle composite catalyst and its preparation method and application in catalytic degradation of heavy metal chromium
  • Supported molybdenum carbide/metal nanoparticle composite catalyst and its preparation method and application in catalytic degradation of heavy metal chromium
  • Supported molybdenum carbide/metal nanoparticle composite catalyst and its preparation method and application in catalytic degradation of heavy metal chromium

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Embodiment 1

[0035] The preparation method of supported molybdenum carbide / metal nanoparticle composite catalyst in the present embodiment is as follows:

[0036] 1. Preparation of molybdenum carbide / metal nanoparticle homogeneous powder

[0037] Add 1.26g (10mmol) melamine to an aqueous solution containing 2.52g (20mmol) oxalic acid dihydrate and 0.2g (0.22mmol) ammonium molybdate tetrahydrate, and continue stirring at 70°C for 6 hours to obtain a homogeneous solution; Add 10mL of an aqueous solution containing 0.4g (1.68mmol) of nickel chloride hexahydrate, continue stirring at 25°C for 12 hours, then evaporate, dry, and grind to obtain a homogeneous powder; place the obtained homogeneous powder in a constant temperature tube-type resistance furnace In the zone, the temperature was raised to 900°C at a rate of 10°C / min and kept at a temperature of 2 hours. After the reaction was completed, it was cooled to room temperature to obtain a pyrolysis product of nitrogen-doped carbon-coated molyb...

Embodiment 2

[0046] The preparation process of the composite catalyst in this example is the same as that in Example 1, the only difference being that 0.4g (1.68mmol) of nickel chloride hexahydrate is replaced by 0.33g (1.68mmol) of ferrous chloride tetrahydrate.

[0047] This example adopts the same method as Example 1 to catalytically reduce hexavalent chromium, the only difference is that the composite catalyst prepared in this example is used to replace the PVDF-supported nitrogen-doped carbon-coated molybdenum carbide / nickel in Example 1 Nano particle composite catalyst, the final degradation rate of hexavalent chromium is 98%.

Embodiment 3

[0049] The preparation process of the composite catalyst in this example is the same as in Example 1, the only difference being that 0.4g (1.68mmol) of nickel chloride hexahydrate is replaced by 0.4g (1.68mmol) of cobalt chloride hexahydrate.

[0050] This example adopts the same method as Example 1 to catalytically reduce hexavalent chromium, the only difference is that the composite catalyst prepared in this example is used to replace the PVDF-supported nitrogen-doped carbon-coated molybdenum carbide / nickel in Example 1 Nano particle composite catalyst, the final degradation rate of hexavalent chromium is 96%.

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Abstract

The invention discloses a supported molybdenum carbide/metal nanoparticle composite catalyst and its preparation method and application in catalytic degradation of heavy metal chromium. The preparation method comprises synthesizing molybdenum carbide/metal nanoparticle homogeneous powder through a high-temperature pyrolysis one-step method, adding the powder, a dispersant and a carrier precursor into N, N-dimethylformamide, carrying out curing formation, and directly separating the supported molybdenum carbide/metal nanoparticle composite catalyst. The composite catalyst contains uniformly distributed active centers. The molybdenum carbide nanoparticles have no sintering or agglomeration phenomenon. The metal ion leaching degree is low. The supported catalyst has stable performances and excellent repeatability, can efficiently catalytically reduce the hexavalent chromium and can convert the hexavalent chromium into non-toxic trivalent chromium.

Description

technical field [0001] The invention relates to a supported molybdenum carbide / metal nanoparticle composite catalyst, a preparation method thereof and an application of catalytically degrading heavy metal chromium, belonging to the technical field of composite materials. Background technique [0002] Hexavalent chromium compounds are widely used in leather, textile production, printing and dyeing, pigment and automobile industries, and play an important role in social and economic development. However, the unreasonable discharge of chromium-containing wastewater by some factories and enterprises will cause serious environmental pollution. Hexavalent chromium is a "three-cause" substance that seriously endangers the health of humans, animals and plants. How to effectively solve the problem of hexavalent chromium pollution has become a current research hotspot. [0003] At present, the methods for removing hexavalent chromium in water mainly include chemical reduction method,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10B01J37/08C02F1/70C02F101/22
CPCB01J27/24B01J35/1061B01J35/1066B01J37/082C02F1/70C02F2101/22
Inventor 姚运金张婕高梦雪连超余茂静胡熠查志远朱钱
Owner HEFEI UNIV OF TECH
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