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A kind of preparation method of active site materials such as p25 loaded molecular state cobalt/nickel

An active site, molecular state technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as poor dispersion, low performance of transition metal cocatalysts, and high price of precious metal cocatalysts. , to achieve the effect of low equipment requirements, low price and mild reaction conditions

Active Publication Date: 2020-09-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of high price of noble metal cocatalysts, low performance of transition metal cocatalysts, poor dispersibility, etc., and provide a method for modifying P25 with active molecular metal cobalt / nickel with controllable loading and good dispersibility

Method used

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  • A kind of preparation method of active site materials such as p25 loaded molecular state cobalt/nickel
  • A kind of preparation method of active site materials such as p25 loaded molecular state cobalt/nickel
  • A kind of preparation method of active site materials such as p25 loaded molecular state cobalt/nickel

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Embodiment 1

[0019] figure 1 It is the HRTEM picture of P25-Co-350 in Example 1 of the present invention, with P25 as the carrier, and ethylenediamine-N, N, N', N'-cobalt (II) tetraacetate disodium salt tetrahydrate as the precursor , to obtain P25-loaded molecular cobalt active sites.

[0020] Take 0.35g of P25, dissolve it in 35mL of methanol, stir for 1 hour, then add 35mg of ethylenediamine-N,N,N',N'-tetraacetate cobalt(II) disodium salt tetrahydrate, maintain magnetic stirring at 40 degrees Celsius until The solvent was completely evaporated, and the solid was collected and roasted at 350°C for 1 hour (heating rate 1K / min), then cooled to normal temperature at 2K / min. The resulting cobalt molecular state modified HRTEM of P25 is as follows figure 1 As shown, the surface is uniform without nanoparticle formation. Its catalytic activity is figure 2 .

Embodiment 2

[0022] Using P25 as the carrier and ethylenediamine-N,N,N',N'-tetraacetate nickel(II) disodium salt tetrahydrate as the precursor, the P25-loaded molecular nickel active sites were obtained.

[0023] Take 0.35g of P25, dissolve it in 35mL of ethanol, stir for 1 hour, then add 35mg of ethylenediamine-N,N,N',N'-tetraacetate nickel (II) disodium salt tetrahydrate, maintain magnetic stirring at 40 degrees Celsius until The solvent was completely evaporated, and the solid was collected and roasted at 350°C for 1 hour (heating rate 1K / min), then cooled to normal temperature at 2K / min. The obtained nickel molecular state modified HRTEM of P25 is as follows image 3 As shown, the surface is uniform without nanoparticle formation.

Embodiment 3

[0025] Take 0.35g of P25, dissolve it in 35mL of methanol, stir for 1 hour, then add 35mg of ethylenediamine-N,N,N',N'-tetraacetate cobalt(II) disodium salt tetrahydrate, maintain magnetic stirring at 40 degrees Celsius until The solvent was completely evaporated, and the solid was collected, and after roasting at 400°C for 1 hour (heating rate 1K / min), it was cooled to normal temperature at 2K / min. The surface of the obtained cobalt molecularly modified P25 is uniform without the formation of nanoparticles. Its HRTEM as Figure 4 shown.

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Abstract

The invention aims to provide a method of obtaining cobalt / nickel molecular state active centers which are distributed uniformly on the surface by the following steps: modifying molecular state cobalt / nickel active sites on the surface of titanium dioxide; and performing roasting treatment by taking P25 as a semiconductor substrate and an EDTA-transitional metal complex as a precursor by means ofa wet process chemical method. The method is simple in production process, green and environment-friendly and cheap in precursor, and the obtained modified P25 has an efficient photocatalytic performance. Compared with other metal salt precursors, the method puts forward an excellent function of a chelate compound, namely the EDTA-transitional metal complex for the first time. The preparation method has a wide application prospect in the catalytic field.

Description

technical field [0001] The invention belongs to a preparation method of active site materials such as P25 loaded with molecular state metal cobalt / nickel, and in particular relates to a preparation method of a semiconductor surface loaded with active molecular state transition metal active centers. Background technique [0002] Titanium dioxide, as a typical semiconductor, has been widely used and widely studied in the field of photocatalysis. However, due to the severe recombination of photogenerated electron-holes in semiconductors and the short lifetime of carriers, improving photon efficiency has always been a challenging problem for research. Therefore, surface-supported modified cocatalysts are usually used to reduce the recombination of photogenerated electrons and holes and at the same time reduce the activation energy required for surface redox reactions, thereby improving the photocatalytic efficiency. Compared with platinum, ruthenium, rhodium and other noble met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01J23/755
Inventor 赵桂霞王祥学文涛王祥科
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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