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Compound catalyst as well as preparation method and application thereof

A composite catalyst and sensitizer technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc. and active, improves absorption, has the effect of stability and activity

Inactive Publication Date: 2019-03-26
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these studies using PAN to enhance photoactivity are mainly based on the fact that PAN promotes the separation of photogenerated charges, and the research on PAN photosensitization for hydrogen production under visible light has not yet been done.

Method used

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  • Compound catalyst as well as preparation method and application thereof
  • Compound catalyst as well as preparation method and application thereof
  • Compound catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0033] The present invention also provides a method for preparing the above-mentioned composite catalyst, comprising: A) obtaining a composite catalyst by oxidizing in-situ polymerization of polyaniline on titanium dioxide loaded with noble metals; the noble metal is selected from one of platinum, palladium and ruthenium or more.

[0034] Among them, the present invention has no special limitation on the sources of all raw materials, which can be commercially available or self-made; the titanium dioxide and polyaniline loaded with precious metals are the same as those described above, and will not be repeated here.

[0035]In the present invention, the noble metal-loaded titanium dioxide is preferably prepared by a reduction method, and more preferably prepared by the following method: mixing titanium dioxide with a noble metal acid compound, and performing a reduction reaction by UV irradiation to obtain the noble metal-loaded titanium dioxide; the noble metal The acid compou...

Embodiment 1

[0047] Preparation of Pt-supported TiO by a photoreduction method 2 Nanoparticles (Pt / TiO 2 ).

[0048] 0.500g TiO 2 (P25) dispersed in H containing a given concentration 2 PtCl 6 (3.1×10 -3 mol / L) and 80 mL of an aqueous solution containing 5.0 mL of absolute ethanol in a Pyrex cell for the irradiation window, followed by UV irradiation (150 W high pressure mercury lamp) and the suspension was stirred for 3 h at room temperature. After irradiation, the reaction mixture was filtered and washed with distilled water, and the samples were dried at 100 °C for 5 h to obtain Pt@TiO 2 (The loading amount of Pt was 0.5 wt%).

[0049] The composite catalyst is PAN-modified Pt@TiO 2 Nanocomposites are prepared by chemical oxidative polymerization. 0.500 g of Pt@TiO prepared 2 Disperse in 20.0 mL of ethanol in a flask and sonicate for at least 20 minutes. Then, 20.0 mL of HCl (1.0 M)-AN (molar ratio AN / TiO 2 =4 / 100) aqueous solution was placed in the suspension system while st...

Embodiment 2

[0057] Photocatalytic H in Pyrex Flasks 2 The experiments were generated and a 150W high pressure mercury lamp with a λ>420nm cutoff filter was used as the light source. Briefly, 0.10 g of PAN-Pt@TiO was 2 or Pt@TiO 2 The catalyst was added to 80.0 mL of an aqueous solution of 0.90 mol / L TGA or other sacrificial electron donors.

[0058] The photocatalytic reaction was carried out in a 190 mL Pyrex flask with a side flat window. A 150W high pressure mercury lamp was used as the light source, which was equipped with a cut-off filter (λ>420nm) to remove radiation below 420nm. The beam's infrared light is removed through a cold water filter to ensure only visible light hits. In a typical reaction, 0.10 g of PAN-Pt@TiO 2 or Pt@TiO 2 The catalyst was added to 80.0 mL of 0.90 mol / L TGA or other electron donor aqueous solution. Before the photoreaction, the catalyst was dispersed in an ultrasonic bath for 5 min and the high purity N 2 Gas was bubbled through the reaction mixt...

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Abstract

The invention provides a compound catalyst. The compound catalyst is prepared from a sensitizing agent and a base material, wherein the sensitizing agent is polyaniline; the base material comprises titanium dioxide and noble metal; the noble metal is loaded on the titanium dioxide; the noble metal is selected from one or more of platinum, palladium and ruthenium. Compared with the prior art, the compound catalyst provided by the invention is used for improving the absorption on a visible-light region through the polyaniline, and crystal structure and size of the titanium dioxide are not influenced; meanwhile, the sensitizing agent and the base material have a mutual effect and electrons are easy to transfer, so that the compound catalyst has high stability and activity; theoretical guidance is provided for developing an artificial photosynthesis H2 production system based on a functional conducive polymer.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production by photolysis of water, and in particular relates to a composite catalyst, its preparation method and application. Background technique [0002] Hydrogen with water as the only reaction product is considered as an ideal energy carrier, and solar photocatalytic water splitting is a promising method for molecular hydrogen production. Among various semiconductor photocatalysts, TiO, first reported by Fujijshma and Honda in 1972 2 is the most commonly used because of its high photoactivity, cheapness, non-toxicity and stability. However, TiO 2 There are some problems in the utilization of , including the rapid recombination of electrons and holes, and the evolution of H 2 low quantum yield. In addition, TiO 2 Limited by the wide energy band gap, it can only absorb ultraviolet light, but ultraviolet light accounts for a very low proportion (about 4%) under natural light, while visible ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38C01B3/04
CPCC01B3/042B01J31/38C01B2203/0277B01J35/39Y02E60/36
Inventor 赵兰华张茜
Owner NANHUA UNIV
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