a co 2 Reductive Bifunctional Photocatalytic Coupled Reaction Method for the Preparation of Renewable Hydrocarbons

A hydrocarbon and coupled reaction technology, applied in the direction of oxidation to prepare carbonyl compounds, carbon compound catalysts, carbon monoxide, etc., can solve the problems of increased economic costs, no improvement in thermodynamics, waste, etc., to improve reaction kinetics and thermodynamics, reduction reaction The effect of high efficiency and promotion of effective utilization

Active Publication Date: 2022-01-11
HUAIBEI NORMAL UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the development of new photocatalysts has improved the separation-migration efficiency (reaction kinetics) of photogenerated carriers to a certain extent, the photocatalytic CO 2 The thermodynamics of the reduced pure water system are still not improved
On the other hand, hole sacrificial agents (such as amines, sodium sulfite, lactic acid, etc.) are used to improve photocatalytic CO 2 The thermodynamics of reduction, although the photocatalytic reaction efficiency has been significantly improved, but there are the following problems: (1) The input-output ratio is increased, and the oxidation of the hole sacrificial agent is exchanged for CO 2 For example, the commonly used hole sacrificial agent L-lactic acid is 49 yuan / 100mL (80%, Shanghai Aladdin Biochemical Technology Co., Ltd., 2019.3.21 official website quotation), while natural gas is about 1.8-5 yuan / 1000000mL; On the other hand, the treatment of sacrificial agent reaction waste liquid will also increase the economic cost
(2) The original green photocatalytic technology is not so green, and the addition of hole sacrificial agent makes the reaction system produce environmental pollutants such as organic pollutants and sulfates, etc.
(3) Waste of energy, the photogenerated holes of the catalyst are not utilized and are wasted in vain

Method used

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  • a co <sub>2</sub> Reductive Bifunctional Photocatalytic Coupled Reaction Method for the Preparation of Renewable Hydrocarbons
  • a co <sub>2</sub> Reductive Bifunctional Photocatalytic Coupled Reaction Method for the Preparation of Renewable Hydrocarbons
  • a co <sub>2</sub> Reductive Bifunctional Photocatalytic Coupled Reaction Method for the Preparation of Renewable Hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] This embodiment prepares Zn according to the following steps 2 In 2 S 5 nanomaterials:

[0021] Step 1, weigh 2mmol zinc sulfate heptahydrate, 2mmol indium chloride hydrate, 10mmol thioacetamide and 0.6g cetyl ammonium bromide respectively in a beaker with 70mL deionized water, stir to dissolve;

[0022] Step 2, transfer the mixed solution in step 1 to a 100ml polytetrafluoroethylene liner, seal it, heat it with water at 160°C, and after 12 hours, wash it with deionized water and dry it in vacuum to obtain Zn 2 In 2 S 5 nanomaterials.

[0023] To the Zn prepared by the embodiment of the present invention 1 2 In 2 S 5 Nanomaterials were characterized, and the results were as follows figure 1 with figure 2 shown. in, figure 1 It is an X-ray diffraction (XRD) pattern, and all the diffraction peaks in the diffraction pattern correspond to the rhombohedral Zn 2 In 2 S 5 . figure 2 It is a transmission electron microscope (TEM) picture, from which it can be ...

Embodiment 2

[0025] This example is a performance test, the detailed steps are as follows:

[0026] Step 1, 0.1g Zn 2 In 2 S 5 Add the powder and 100mL of deionized water into a three-port polytetrafluoroethylene or glass reactor;

[0027] Step 2, one port of the reactor is connected to the vacuum pump, and the other port is connected to CO 2 Gas cylinder, the other branch is connected to the gas chromatograph;

[0028] Step 3, use a vacuum pump to remove the air in the reactor, and introduce CO 2 (40Kpa), stirring makes catalyst and reactant mix uniformly and fully contact;

[0029] Step 4: Turn on the light to obtain a visible light source, irradiate the reaction solution inside the reaction vessel through the glass window of the reaction vessel, and monitor and analyze the gas phase products online every hour. After the reaction, analyze and detect the liquid phase products in the reaction solution.

[0030] The result is as image 3 Visible, Zn 2 In 2 S 5 Catalytic reduction ...

Embodiment 3

[0032] This example is the same as Example 2, except that the reaction liquid used in step 1 is 0.3 mol / L, 100 mL aqueous solution of L-lactic acid (L-lactic acid is a hole sacrificial agent).

[0033] The result is as Figure 4 , the addition of sacrificial agent makes Zn 2 In 2 S 5 catalytic reduction of CO 2 The activity has been significantly improved, and the main products are CO and CH 4 , and their formation rates were 6.1 μmol / g / h and 50.3 μmol / g / h, respectively.

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Abstract

The invention discloses a CO 2 The method for preparing renewable hydrocarbons by reducing bifunctional photocatalytic coupling reactions comprises the following steps: (1) dehydrogenating biomass alcohol hydroxyl groups with photogenerated hole selective oxidation and photogenerated electrons selectively reducing CO 2 The semiconductor nanomaterials with hydrogenation function and the mixed solution of biomass containing alcoholic hydroxyl groups and water are added to the three-port polytetrafluoroethylene reactor; (2) one port of the reactor is connected to a vacuum pump to remove the air in the reactor, and the other port is connected to CO 2 Gas cylinder into CO 2 , the other branch is connected to the gas chromatograph, stirring to mix the reactants evenly; (3) turning on the visible light source to irradiate the reaction solution, extracting the reaction solution and centrifuging to obtain the liquid phase product renewable hydrocarbons. The invention realizes the full utilization of photogenerated electrons and holes, and is used to selectively convert biomass to prepare high value-added chemicals (such as carbonyl compounds), with a yield of 1750 μmol / g, which is environmentally friendly.

Description

technical field [0001] The present invention relates to the preparation method of hydrocarbon, in particular to a method using CO 2 Reductive bifunctional photocatalytic coupled reactions for the preparation of renewable hydrocarbons. Background technique [0002] CO 2 The increasing concentration has produced immeasurable impact on the global environment, climate and organisms. Therefore, how to achieve CO 2 The capture, storage and utilization of resources have become the focus and focus of global scientific and technological research. Among several feasible strategies, the catalytic conversion of carbon dioxide into renewable hydrocarbon fuels (CO 2 +H 2 O→hydrocarbon+O 2 ), using hydrocarbon fuels as energy carriers, can realize carbon recycling. Hydrocarbons are also stable, efficient and clean energy sources that are often used. In this way, not only can the global energy crisis be solved, but also the "carbon cycle" can be realized, and the excessive carbon di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C9/04C07C45/29C07C47/54C07D307/46C01B32/40B01J27/04
CPCC07C1/20C07C45/29C07D307/46C01B32/40B01J27/04B01J35/004C07C2527/04C07C9/04C07C47/54
Inventor 孟苏刚郑秀珍吴惠惠付先亮陈士夫
Owner HUAIBEI NORMAL UNIVERSITY
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