An ionic liquid-assisted preparation of pt/tio 2 New methods and uses of catalysts

A technology of ionic liquids and catalysts, applied in the field of materials, can solve problems such as complex steps, and achieve the effects of rich oxygen vacancies, strong light absorption ability, and small crystal size

Active Publication Date: 2020-05-19
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Composite materials of noble metals and titanium dioxide are usually prepared by a two-step method: first prepare titanium dioxide, and then combine noble metals with titanium dioxide by methods such as photodeposition or sputtering, which are complex steps

Method used

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  • An ionic liquid-assisted preparation of pt/tio <sub>2</sub> New methods and uses of catalysts
  • An ionic liquid-assisted preparation of pt/tio <sub>2</sub> New methods and uses of catalysts
  • An ionic liquid-assisted preparation of pt/tio <sub>2</sub> New methods and uses of catalysts

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The Pt / TiO of this embodiment 2 The synthesis method is as follows:

[0041] Synthesis of Pt / TiO 2 The ionic liquid used is 1-ethyl-3-methylimidazolium tetrafluoroborate (EmimBF 4 ), as shown in formula (II).

[0042]

[0043] 6.25mg chloroplatinic acid hexahydrate (H 2 PtCl 6 ·6H 2 O) Dissolve in a mixture of 1.25g 1-ethyl-3-methylimidazolium tetrafluoroborate and 1.25g deionized water, add 1mL tetrabutyl titanate dropwise while vigorously stirring, and transfer the above mixture into In a 15mL autoclave, the reaction was stirred at 150°C for 12h. After the reaction, the reaction kettle was naturally cooled to room temperature, and the reaction suspension was centrifuged to obtain a solid, which was fully washed with deionized water for 5 times, and vacuum-dried overnight at 80°C to obtain the final product.

[0044] The obtained product was characterized by X-ray diffraction, transmission electron microscope, high-resolution transmission electron microscope ...

Embodiment 2

[0049] The Pt / TiO of this embodiment 2 The synthesis method is as follows:

[0050] Synthesis of Pt / TiO 2 The ionic liquid used is 1-ethyl-3-methylimidazolium chloride (EmimCl), as shown in formula (III).

[0051]

[0052] 6.25mg chloroplatinic acid hexahydrate (H 2 PtCl 6 ·6H 2 O) Dissolve in a mixture of 1.25g 1-ethyl-3-methylimidazolium chloride salt and 1.25g deionized water, add 1mL tetrabutyl titanate dropwise while vigorously stirring, transfer the above mixture into a 15mL autoclave , stirred at 150°C for 12h. After the reaction, the reaction kettle was naturally cooled to room temperature, and the reaction suspension was centrifuged to obtain a solid, which was fully washed with deionized water for 5 times, and vacuum-dried overnight at 80°C to obtain the final product.

[0053] The resulting product was characterized by X-ray diffraction, and the results were as follows: Figure 5 As shown, the obtained product is anatase phase TiO 2 (JCPDS card no. 21-127...

Embodiment 3

[0057] The Pt / TiO of this embodiment 2 The synthesis method is as follows:

[0058] Synthesis of Pt / TiO 2 The ionic liquid used is 1-ethyl-3-methylimidazolium bromide (EmimBr), as shown in formula (IV).

[0059]

[0060] 6.25mg chloroplatinic acid hexahydrate (H 2 PtCl 6 ·6H 2 O) Dissolve in a mixture of 1.25g 1-ethyl-3-methylimidazolium bromide and 1.25g deionized water, add 1mL tetrabutyl titanate dropwise while vigorously stirring, transfer the above mixture into a 15mL autoclave , stirred at 150°C for 12h. After the reaction, the reaction kettle was naturally cooled to room temperature, and the reaction suspension was centrifuged to obtain a solid, which was fully washed with deionized water for 5 times, and vacuum-dried overnight at 80°C to obtain the final product.

[0061] The resulting product was characterized by X-ray diffraction, and the results were as follows: Figure 8 As shown, the obtained product is anatase phase TiO 2 (JCPDS card no. 21-1272).

[...

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Abstract

The invention discloses an ionic liquid-assisted novel method for preparing a Pt / TiO2 catalyst. In the method, an ionic liquid has multiple roles including a solvent, a reducing agent for a platinum precursor and a doping sources for heteroatoms. The heteroatom-doped Pt / TiO2 nanocrystal is prepared by using a one-step method under the assistance action of the ionic liquid, and the method is simple, environmentally friendly and controllable. The Pt / TiO2 nanocrystal is applied to a photocatalytic hydrogen production reaction from water under the condition of simulated sunlight, and has high catalytic activity and high stability.

Description

technical field [0001] The invention belongs to the field of materials, and relates to an ionic liquid-assisted preparation of Pt / TiO 2 New methods and uses of catalysts. Background technique [0002] TiO2 is a well-known photocatalyst that can be applied in different chemical reactions, such as organic matter degradation, hydrogen production, nitrogen oxide decomposition, alcohol oxidation, and carbon dioxide reduction, etc. However, the valence bandwidth and relatively high recombination rate of photogenerated electron-hole pairs of titanium dioxide limit its photocatalytic activity. Combining noble metals with TiO2 is an effective way to improve the photogenerated electron-hole separation efficiency and light utilization ability of TiO2. The composite material of noble metal and titanium dioxide is usually prepared by a two-step method: first prepare titanium dioxide, and then combine noble metal and titanium dioxide by methods such as photodeposition or sputtering. Thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/13B01J37/16C01B3/04B82Y30/00B82Y40/00
CPCB01J27/13B01J35/004B01J37/16C01B3/042C01B2203/0277C01B2203/107Y02E60/36Y02P20/54
Inventor 谭秀娘张建玲谭东兴石金彪程修艳章凡玉
Owner INST OF CHEM CHINESE ACAD OF SCI
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