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Method for promoting photochemical reduction of CO2 and N2 by using sodium sulfite

A sodium sulfite and CO2 technology, applied in the field of photochemistry, can solve the problems of increasing the burden of environmental treatment of reaction waste, increasing the cost of reduction reaction, etc., and achieve the effects of simple and mature preparation method, improved reduction efficiency, and mild reaction conditions

Inactive Publication Date: 2016-10-12
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The use of organic sacrificial agents and organic solvents not only increases the cost of the reduction reaction, but also increases the burden on environmental governance by the discharge of reaction waste

Method used

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  • Method for promoting photochemical reduction of CO2 and N2 by using sodium sulfite
  • Method for promoting photochemical reduction of CO2 and N2 by using sodium sulfite
  • Method for promoting photochemical reduction of CO2 and N2 by using sodium sulfite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1C

[0026] Example 1CO 2 Reduction to HCOOH

[0027] for CO 2 Molecular reduction and utilization, commercial high-purity CO 2 For the reaction gas, HCOOH is the target product. Use Na 2 SO 3 As a photosensitizer, under the irradiation of a 254nm ultraviolet lamp, measure the CO of this method 2 restore performance. Proceed as follows:

[0028] Take 50mmol / L of Na 2 SO 3 Solution 50mL, into which continuous high-purity CO 2Gas, the ventilation time is 40 minutes, and the gas flow rate is 30 ml / min, so that the pH value of the system tends to be neutral). Stir with a magnetic stirrer to mix the solution evenly, and the rotation speed is 400 rpm. 254nm ultraviolet irradiation (light source power is 16W), investigate Na 2 SO 3 Photocatalytic reduction of CO 2 performance. At the same time, the traditional KI photochemical reduction system was used as a control experiment, and the results are shown in figure 1 . figure 1 As shown, the yield of HCOOH reached 26 mg / L wh...

Embodiment 2

[0029] Example 2 Different Na 2 SO 3 CO reduction 2 for HCOOH

[0030] With concentrations of 25mmol / L, 50mmol / L, 75mmol / L, 100mmol / L Na 2 SO 3 The aqueous solution is used as the reaction medium, and CO is introduced into it 2 To saturation, at this moment, the pH value of the initial reaction solution is about 7.0. Then under the irradiation of 254nm ultraviolet lamp, evaluate different Na 2 SO 3 Concentration of photochemical CO in the system 2 The effect of reducing performance, see the results image 3 . Such as figure 2 As shown, Na 2 SO 3 When the concentration is 75mmol / L, the CO of the system 2 Best restore performance. Na 2 SO 3 When the concentration is 50mmol / L, Na 2 SO 3 The ratio of the input to the output of HCOOH is the largest.

Embodiment 3

[0031] Example 3 Reduction of CO under different pH conditions 2 for HCOOH

[0032] With a concentration of 50mmol / L Na 2 SO 3 The aqueous solution is used as the reaction medium, and CO is introduced into it 2 To saturation, then add dilute sulfuric acid or sodium hydroxide to adjust the initial pH value of the solution to 5.0, 7.0 and 9.0. Then the photochemical CO of the system was evaluated under the irradiation of 254nm ultraviolet light 2 To restore performance, see the results image 3 . Such as image 3 As shown, CO under neutral conditions 2 Best restore performance.

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Abstract

The invention relates to a method for promoting photochemical reduction of CO2 and N2 by using sodium sulfite. The method comprises the following steps: adding sodium sulfite into water; introducing CO2 or N2; controlling the pH value of the system to 5.0-9.0; and performing ultraviolet irradiation on the system to realize reduction of CO2 and N2 in an ultraviolet irradiation condition enabling a photosensitive reaction of the sodium sulfite. In the method, inert molecule activation obstacle in traditional photochemical system is solved, and the 'bottleneck reaction' in the CO2 reduction and nitrogen fixation processes is overcome; and moreover, the whole reaction process is performed in a water phase, and an organic sacrificial agent is not needed. When applied to CO2 reduction and nitrogen fixation reactions, the method has the advantages of high efficiency, high selectivity, environmental friendliness, no secondary pollution and the like.

Description

technical field [0001] The invention belongs to the field of photochemistry, in particular to a CO 2 and N 2 The photochemical reduction method is suitable for the development of available gas resources in the fields of energy and environment. Background technique [0002] The combustion of fossil fuels is still the most important means of energy supply today, but with the continuous exploitation of resource-based energy, my country's energy and resource shortages are becoming increasingly severe. At the same time, the use of fossil combustion is accompanied by a large amount of CO 2 release of CO in the atmosphere 2 The increase in the concentration leads to the more obvious heat preservation effect on the earth's surface, which leads to the emergence of global warming. Therefore, while developing new alternative resources, it is imperative to solve environmental problems such as excessive greenhouse gas and industrial waste pollution caused by resource consumption. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32C02F1/70C02F101/16
CPCC02F1/32C02F1/70C02F2101/16C02F2305/10
Inventor 张礼知蔡乐娟
Owner HUAZHONG NORMAL UNIV
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