Preparation and application of photocatalyst LaOF

A technology of lanthanum oxyfluoride and photocatalyst, which is applied in physical/chemical process catalysts, chemical instruments and methods, hydrogen production, etc. The effect of simple and easy promotion and preparation method

Inactive Publication Date: 2013-02-27
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The methods for preparing hydrogen mainly include electrolysis of water, catalytic reforming of low-carbon organic matter, etc., but there is a shortage of energy consumption, and the prospect of industrial application is not high.

Method used

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  • Preparation and application of photocatalyst LaOF
  • Preparation and application of photocatalyst LaOF
  • Preparation and application of photocatalyst LaOF

Examples

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preparation example Construction

[0016] The preparation method of this photocatalyst is the synthetic method of hydrothermal-heat treatment: concrete steps are as follows:

[0017] (1) Preparation of the precursor: Dissolve the fluoride solid as the fluorine source: ammonium fluoride or sodium fluoride in deionized water, ethylene glycol or ethanol, or a mixed solvent of two of them to obtain a concentration of 0.1~1 mol / L fluorine source solution; the compound solid as the lanthanum source: one of lanthanum oxide, lanthanum nitrate or lanthanum acetate dissolved in one or both of deionized water, ethylene glycol or ethanol Prepare a lanthanum source solution with a concentration of 0.01-0.1 mol / L in a mixed solvent; add the fluorine source solution dropwise while stirring in the lanthanum source solution, and continue stirring for 30-180 minutes to obtain a white turbid liquid, which is transferred to a high-pressure reaction kettle for 90 React at a constant temperature of ~180°C for 12-24 hours, wash the p...

Embodiment 1

[0020] Preparation of LaOF catalyst

[0021] Weigh 0.0127 mol NH 4 The F solid was dissolved in 40 mL of deionized water and stirred for 2 min to give NH 4 F solution; another 0.0061 mol La 2 o 3 The solid was dissolved in 40 mL deionized water, and an appropriate amount of NH was added dropwise while stirring 4 F solution, continue to stir for 30 minutes, transfer the obtained white turbid liquid into a high-pressure reactor, keep the temperature at 180°C for 18 hours, centrifuge the obtained precipitate, wash, dry at 40°C for 24 hours, calcinate at 300°C for 6 hours, and finally grind A white LaOF powder was obtained.

Embodiment 2

[0023] Preparation of LaOF catalyst

[0024] Weigh 0.0127 mol NH 4 The F solid was dissolved in 40 mL of deionized water and stirred for 2 min to give NH 4 F solution; another 0.0061 mol La 2 o 3 The solid was dissolved in 40 mL deionized water, and an appropriate amount of NH was added dropwise while stirring 4 F solution, continue to stir for 3 hours, transfer the obtained white turbid liquid into a high-pressure reactor, keep the temperature at 135°C for 24 hours, centrifuge the obtained precipitate, wash, dry at 120°C for 6 hours, calcinate at 800°C for 4 hours, and finally grind A white LaOF powder was obtained.

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Abstract

The invention discloses a preparation and application of a photocatalyst LaOF. The photocatalyst LaOF prepared by a hydro-thermal-heat treatment synthetic method can be used for hydrogen production by water photolysis. According to the invention, the LaOF (LaO1-xF1+2x, x=0,0.3,0.35,0.4) is used in the field of hydrogen production by water photolysis for the first time. The preparation method is simple and has no need of complicated and expensive devices, has mild synthesis conditions, and is beneficial for large scale popularization.

Description

technical field [0001] The invention belongs to the technical field of novel material preparation and hydrogen production by photolysis of water, and specifically relates to the preparation and application of photocatalyst lanthanum oxyfluoride. technical background [0002] With the increasingly serious energy crisis and environmental pollution, finding a sustainable energy source is the exploration goal of many researchers. Hydrogen is abundant, and the only product of hydrogen combustion is clean water, which is considered as an alternative energy source to traditional fossil fuels. The methods for preparing hydrogen mainly include electrolysis of water, catalytic reforming of low-carbon organic matter, etc., but all of them have the disadvantage of high energy consumption, and the prospects for industrial application are not high. Since the 1960s, semiconductor photocatalytic water splitting has received great attention. Using solar photocatalytic water splitting techno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/12C01B3/04
CPCY02E60/364Y02E60/36
Inventor 苏文悦解泉华付贤智刘平陈旬王绪绪戴文新李朝晖
Owner FUZHOU UNIV
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