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Method used for photocatalytic reduction of carbon dioxide

A carbon dioxide, photocatalytic technology, applied in chemical instruments and methods, separation methods, hydrocarbon production from carbon oxides, etc., can solve the problems of non-absorption of visible light, easy composite photocatalytic efficiency, etc., to achieve simple process and improve photocatalytic efficiency. , the effect of easy operation

Inactive Publication Date: 2015-12-09
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to make up for TiO 2 It has the defects of no absorption of visible light and low photocatalytic efficiency due to the easy recombination of photogenerated electrons and holes generated by photoexcitation, providing a method for photocatalytic reduction of carbon dioxide

Method used

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Examples

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Effect test

Embodiment 1

[0021] The method for photocatalytic reduction of carbon dioxide, the operation steps are as follows:

[0022] 1. Y-doped TiO 2 Preparation of photocatalyst: configure 40mL ethanol solution with a volume concentration of 45% tetrabutyl titanate, then use 5mL absolute ethanol, 10mL glacial acetic acid, and 5mL deionized water to add yttrium nitrate according to 0.1% of Ti molar weight to make nitric acid For the yttrium solution, slowly drop the tetrabutyl titanate ethanol solution into the yttrium nitrate solution under agitation to form a sol, and leave it to stand for 3 hours after the drop to form a gel. Dry the gel at 100°C for 12h, take it out, cool it, grind it, put it into a muffle furnace and calcinate it at 300°C for 3h, and then get 0.1% Y-doped TiO 2 catalyst of light.

[0023] 2. The process of photocatalytic reduction of carbon dioxide: add 200mL0.25mol / LNa 2 CO 3 The aqueous solution is the reaction solution, and 0.1% Y-doped TiO is added in an amount of 0.5g...

Embodiment 2

[0025] The method for photocatalytic reduction of carbon dioxide, the operation steps are as follows:

[0026] 1. Y-doped TiO 2 Preparation of photocatalyst: configure 40mL ethanol solution with a volume concentration of 45% tetrabutyl titanate, then use 5mL absolute ethanol, 10mL glacial acetic acid, and 5mL deionized water to add yttrium nitrate according to 0.5% of Ti molar weight to make nitric acid For the yttrium solution, slowly drop the tetrabutyl titanate ethanol solution into the yttrium nitrate solution under agitation to form a sol, and leave it to stand for 3 hours after the drop to form a gel. Dry the gel at 100°C for 12h, take it out, cool it, grind it, put it into a muffle furnace and calcinate it at 400°C for 3h to get 0.5% Y-doped TiO 2 catalyst of light.

[0027] 2. The process of photocatalytic reduction of carbon dioxide: add 200mL0.08mol / LNa 2 SO 3 The aqueous solution is the reaction solution, and 0.5% Y-doped TiO is added in an amount of 2g / L 2 As ...

Embodiment 3

[0029] The method for photocatalytic reduction of carbon dioxide, the operation steps are as follows:

[0030] 1. Y-doped TiO 2 Preparation of photocatalyst: configure 40mL volume concentration as 45% tetrabutyl titanate ethanol solution, then use 5mL absolute ethanol, 10mL glacial acetic acid, 5mL deionized water, and then add yttrium nitrate by 8% of Ti molar weight, Prepare the yttrium nitrate solution, slowly drop the tetrabutyl titanate ethanol solution into the yttrium nitrate solution under stirring to form a sol, and let stand for 3 hours after the dripping to form a gel. Dry the gel at 100°C for 12h, take it out, cool it, grind it, put it into a muffle furnace and calcinate it at 600°C for 3h to get 3% Y-doped TiO 2 catalyst of light.

[0031] 2. The process of photocatalytic reduction of carbon dioxide: add 200mL0.25mol / LNa 2 CO 3 , according to the dosage of 5g / L, add 3% Y-TiO 2 As a photocatalyst, carbon dioxide was introduced at a flow rate of 400mL / min, and ...

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Abstract

The invention discloses a method used for photocatalytic reduction of carbon dioxide. The method mainly comprises preparation of a Y-doped TiO2 photocatalyst and photocatalytic reduction of carbon dioxide. According to the method, the Y-doped TiO2 photocatalyst is prepared via sol-gel method and roasting at 300 to 800 DEG C, and doping amount ranges from 0.1 to 8%. In carbon dioxide photocatalytic reduction processes, in an inner illumination photo-catalytic reactor, 200ml of Na2CO3 or Na2SO3 aqueous solution is added as a reaction solution, the Y-doped TiO2 photocatalyst is added, a 500W mercury lamp or xenon lamp is taken as a light source, carbon dioxide is added, and carbon dioxide photocatalytic reduction is carried out for 1 to 6h at normal temperature so as to obtain carbon dioxide reduction product formic acid. The method is simple; operation is convenient; the process is green; and greenhouse gas carbon dioxide is transformed into an useful chemical product.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of carbon dioxide, in particular to a method for photocatalytically reducing carbon dioxide. Background technique [0002] Energy and environmental issues are two major problems facing human beings. With the increase of atmospheric CO 2 The increasing concentration and global warming have led to an increase in disastrous weather year by year. Therefore, how to reduce CO 2 The control and utilization of the emission from the source has become a global concern. People are constantly exploring CO 2 In the process of emission reduction technology, it was found that photocatalytic technology has the advantages of mild reaction conditions, environmental protection, no pollution, and low energy consumption, so it has attracted the attention of scientists. [0003] Photocatalytic reduction of CO 2 The key point is to prepare high-efficiency photocatalysts. Studies have shown that TiO 2 Not o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/62C07C1/02B01J23/10
Inventor 秦祖赠吴彩莹覃桂英龚俊杰王浅朱陈韦方田会苏通明
Owner GUANGXI UNIV
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