Three-phase ultrasound light-catalyzed reaction device and method for CO2 reduction thereof

A photocatalytic reaction, CO2 technology, applied in chemical instruments and methods, separation methods, chemical/physical processes, etc., can solve the problems of low effective utilization of light, high toxicity of organic solvents, low reduction efficiency, etc., to achieve improved reduction effect, shortened reaction time, effect of shortened light time

Inactive Publication Date: 2008-03-12
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, there are disadvantages such as low effective utilization of light, low reduction efficiency, high toxicity of organic solvents, high cost and long illumination time.

Method used

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  • Three-phase ultrasound light-catalyzed reaction device and method for CO2 reduction thereof

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Experimental program
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Effect test

Embodiment 1

[0026] Catalyst prepared by in-situ synthesis method: Add butyl titanate, ethanol, and acetic acid into a three-necked flask with a stirrer at a ratio of 1:4:4, and then add phthalonitrile and metal salt solution to the butyl titanate phase Add in a ratio of 0.7%, add a certain amount of solvent and keep stirring, adjust the pH to about 4 with hydrochloric acid, react for 14 hours, place and age for 24 hours, dry at 100°C, roast and grind at 400°C, and prepare granular in-situ synthesized CoPc / TiO 2 catalyst of light. According to XRD analysis, it can be known that TiO 2 The crystal form is mainly anatase type, and the average diameter of the catalyst is 15nm. 2 CoPc was synthesized in situ on the surface.

[0027] CO of the present invention 2 The reduction process flow is as follows: 150 mg of the prepared photocatalyst and 100 mL of 0.1 mol / L sodium hydroxide solution are placed in a quartz tube photoreactor, and then the photoreactor is placed in the water bath of the ...

Embodiment 2

[0032] In the photoreactor made of Pyrex glass tube, 200 mg of photocatalyst and 100 mL of 0.1 mol / L sodium hydroxide solution in Example 1 were added, and CO 2 After a certain period of time, the gas inlet is closed. The light source is sunlight gathered by a concave mirror. The distance between the light source and the photoreactor is 80cm. Then the photoreactor is placed in the water bath of the ultrasonic generator. The ultrasonic power is 200W and the frequency 50KHz, after 18 hours of irradiation and ultrasonic reaction, the product can be analyzed to obtain 307.9 μmol / g-cat of formic acid, 261.8 μmol / g-cat of formaldehyde, and 53.6 μmol / g-cat of methanol.

Embodiment 3

[0037] Preparation of photocatalyst by impregnation method: Commercial TiO produced by Beijing Chemical Plant 2 After activation at a constant temperature of 500°C for 2 hours, place in the organic solvent toluene, dissolve cobalt phthalocyanine (CoPc), press TiO 2 The mass ratio of CoPc to CoPc was added at a ratio of 100:3, and after impregnation for a certain period of time, the CoPc / TiO prepared by impregnation method was obtained. 2 Catalyst, dried and calcined at 250°C, XRD analysis shows that TiO 2 The crystal form is mainly anatase type, and the average diameter of the catalyst is 58nm. CO 2 The reduction process flow is as in Example 1, the CoPc / TiO prepared by the impregnation method 2 Catalyst 150mg and 0.1mol / L 100mL sodium hydroxide aqueous solution are placed in a quartz tube photoreactor, then the photoreactor is placed in an ultrasonic generator, and CO is introduced into the photoreactor 2 After the gas is ventilated, under ultrasonic stirring, visible lig...

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Abstract

The present invention discloses a three-phase ultrasonic photo-catalyzed reaction device and a CO2 reducing method with the device. With the device, a photo-catalyst is placed in a photo-reactor, and the reactor is placed in a water bath of an ultrasonic generator. A light source is arranged above the photo-reactor. The method is that the CO2 gas to be reduced is mixed evenly with the photo-catalyst and a sodium hydroxide solution in the photo-reactor under the ultrasonic action, and reacts for 3-20 hours with radiation of the light source. Then the CO2 gas is reduced. The photo-catalyst is made from titanium dioxide or silicon dioxide and metal phthalocyanine. Metal phthalocyanine is supported on the surface of titanium dioxide in the way of in-situ synthesis, sol-gel, and immersion. The present invention promotes the photo-catalysis efficiency, reduces the reaction time, and saves the energy. Visible light can be used for reducing. Moreover, the phot-catalyst can be recycled, which reduces the pollution and the cost, sot the present invention is quite applicable for the three-phase ultrasonic photo-catalyzed reaction device and photo-catalyzed CO2 reducing.

Description

technical field [0001] The invention relates to a photocatalytic reaction device and its reduction of CO 2 method, especially an ultrasonic photocatalytic reaction device that can be used in three-phase reactions and its photocatalyst to reduce CO 2 Methods. technical background [0002] For the greenhouse gas CO 2 There are many methods of treatment, such as absorption, deep ocean burial, biological conversion, electrochemical reduction, photochemical reduction, photoelectrochemical reduction, etc., but usually the efficiency is not high, and due to CO 2 It is the final oxidation product of organic matter and the highest oxide form of carbon. It is extremely stable in thermodynamics and inert in kinetics, so it is very difficult to reduce it without causing secondary pollution. . However, due to the impact of greenhouse gases, the temperature is rising year by year around the world, which brings many hazards to human survival, such as drought, plague, heat waves, insect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/62B01J8/00B01J19/08
CPCY02A50/20
Inventor 赵志换王俊文范济民赵煜谢明明王志忠
Owner TAIYUAN UNIV OF TECH
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