Carbon dioxide reduction method

A technology of carbon dioxide and raw materials, applied in the field of comprehensive utilization of carbon dioxide, to achieve the effects of good reaction rate, high energy utilization rate and simple process

Active Publication Date: 2015-04-01
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also some problems in the photocatalytic method, such as selecting a semiconductor catalyst with a suitable band gap to improve the selectivity and yield of the product; how to effectively use the light source to increase the CO 2 Conversion rate; finding a suitable photoreactor and so on need to be solved urgently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Using 0.25mol / L Na 2 CO 3 The aqueous solution is the reaction solution, adding 0.5g / L Bi 2 WO 6 Photocatalyst, placed in an externally illuminated photocatalytic reactor, start the magnetic stirrer, turn on the cooling water, use a 300W xenon lamp as the light source, pass in carbon dioxide at a rate of 10mL / min, carry out the photocatalytic carbon dioxide reduction reaction at room temperature for 0.5h, formic acid The yields of , methanol and methane were 3621.54μmol / g-cat, 2658.90μmol / g-cat and 2564.85μmol / g-cat, respectively.

Embodiment 2

[0019] Using 0.45mol / L Na 2 SO 3 The aqueous solution is the reaction liquid, adding 0.20g / L Bi 2 MoO 6 Photocatalyst, placed in a suspended photocatalytic reactor, start the magnetic stirrer, turn on the cooling water, use sunlight as the light source, pass in carbon dioxide at 20mL / min, carry out the photocatalytic carbon dioxide reduction reaction at room temperature for 1.5h, formic acid, methanol, The yields of methane were 3526.65μmol / g-cat, 4147.52μmol / g-cat, and 2164.65μmol / g-cat, respectively.

Embodiment 3

[0021] Use 0.75mol / L NaOH aqueous solution as the reaction solution, add 3.0g / L TiO 2 Photocatalyst, placed in a liquid film photocatalytic reactor, start the magnetic stirrer, turn on the cooling water, use a 300W mercury lamp as the light source, pass in carbon dioxide at 40mL / min, carry out the photocatalytic carbon dioxide reduction reaction at room temperature for 4.5h, formic acid The yields of , methanol and methane were 5984.26 μmol / g-cat, 2461.36 μmol / g-cat and 6541.35 μmol / g-cat, respectively.

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PUM

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Abstract

The invention discloses a carbon dioxide reduction method which comprises the following steps: by using carbon dioxide as a raw material and a NaOH, Na2CO3 or Na2SO3 water solution with a certain concentration as a reaction solution and adding 0.2-5.0 g/L composite photocatalyst of oxide of Ti, Bi, W, V, Mo or Y, putting in an internal irradiation, external irradiation, suspension or liquid-film photocatalytic reactor, and introducing carbon dioxide at 10-60 mL/minute to carry out photocatalytic carbon dioxide reduction reaction at normal temperature for 0.5-5 hours by using a mercury lamp, xenon lamp or sunlight as a light source, thereby obtaining formic acid, methanol, methane and other carbon dioxide reduction products. The method has the advantages of simple technique and green reaction process, can catalytically convert the carbon dioxide into useful chemical products, and thus, has favorable economic benefit and environmental benefit.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide comprehensive utilization. Specifically, a carbon dioxide reduction method. Background technique [0002] Today, when the world's energy is increasingly scarce and the environmental protection situation is becoming increasingly severe, solar energy has attracted more and more attention from the world because of its abundant energy, pollution-free and safe use. Therefore, the development and utilization of solar energy has always attracted people's great interest. [0003] Carbon dioxide is an indispensable basic carbon resource in all life activities including human beings. In nature, the photosynthesis of green plants is the starting point for the fixation of carbon dioxide and the synthesis of organic substances, and is a necessary condition for the survival of all organisms on the earth. Coal and oil are the accumulated products of photosynthesis. In recent years, the consumption of pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C27/04C07C29/15C07C31/04C07C51/00C07C53/02C07C1/02C07C9/04
CPCC07C1/02C07C29/15C07C51/00C07C31/04C07C53/02C07C9/04Y02P20/141
Inventor 秦祖赠苏通明田会蒋月秀纪红兵
Owner GUANGXI UNIV
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