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Carbon dioxide recycling method

A carbon dioxide, resource-recycling technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, preparation of organic compounds, etc., can solve problems such as large energy consumption, and achieve simple equipment and mild reaction conditions. , the effect of high catalytic efficiency

Active Publication Date: 2016-08-24
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing hydrogenation catalytic reduction methods are all carried out under high temperature conditions (generally 500°C to 600°C), requiring a large amount of additional energy consumption, and even precious metals or metal oxides as catalysts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 38g NiCl 2 ·H 2 O was dissolved in a mixed solution of 500ml ethanol and water (the volume ratio of ethanol and water was 4:1), mixed thoroughly and transferred to a three-necked bottle; 14.16g NaBH 4 Add 1NaOH to 400ml anaerobic water as a reducing agent; expose N to the three-necked bottle 15 minutes in advance2 to remove NiCl 2 Oxygen in the solution, then while stirring vigorously, slowly add reducing agent to it through a constant pressure funnel. After the reducing agent is dripped, continue to stir vigorously for 30 minutes to ensure sufficient reaction, and then wash with anaerobic water and ethanol for 5~ 6 times, put it into a vacuum drying oven at 65° C. and dry overnight to obtain nano-nickel, which is stored in an anaerobic glove box for future use.

[0044] figure 1 Schematic diagram of the nano-nickel preparation device.

[0045] Utilize transmission electron microscope to analyze the nano-nickel obtained in embodiment 1, obtain its transmission elect...

Embodiment 2

[0048] 35ml 10mmol / L NaHCO 3 solution (as CO 2 Source) into a serum bottle with a total volume of 65ml, adjust the pH value to 6 with 5% dilute HCl by volume, and expose to N 2 10min to remove oxygen in the serum bottle, add 1g of nano-nickel prepared in Example 1 and expose to H 2 5min, make H 2 Fill the headspace of the serum bottle, cover with a rubber stopper, seal with an aluminum cap, and then expose a small amount of H 2 Make headspace final H 2 The pressure is 1.2 to 1.5 atmospheres, and the experiment has three parallel samples. Put the packed serum bottle into a shaker, control the temperature at 35°C, shake at a speed of 220rpm, and expose to H once every 24h. 2 Make the headspace pressure to 1 atmosphere, and regularly detect the headspace gas (GC) and liquid components (HPLC), such as Figure 4 as shown, Figure 4 is the HPLC chromatogram of the liquid components, given by Figure 4 It can be seen that the final product is determined to be formic acid. ...

Embodiment 3

[0051] 35ml 10mmol / L NaHCO 3 solution (as CO 2 Source) into a serum bottle with a total volume of 65ml, adjust the pH value to 6 with 5% dilute HCl by volume, and expose to N 2 10min to remove oxygen in the serum bottle, add 1g of nano-nickel prepared in Example 1 and expose to H 2 5min, make H 2 Fill the headspace of the serum bottle, cover with a rubber stopper, seal with an aluminum cap, and then expose a small amount of H 2 Make headspace final H 2 It is 1.2 to 1.5 atmospheres. Put the packed serum bottle into a shaker, control the temperature at 35°C, and shake at a speed of 220rpm. The experiment is divided into two groups, group A and group B. Group A is exposed to H once every 24 hours. 2 The headspace pressure was set at 1 atmosphere, and group B was only initially exposed to 1.2 to 1.5 atmospheres of H 2 No exposure to H during the post-reaction 2 , two groups of headspace gas (GC) and liquid components (HPLC) were regularly detected, and the standard relati...

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Abstract

The invention provides a carbon dioxide recycling method. In the presence of nano nickel, a carbon dioxide source reacts with a reducing agent to obtain methanoic acid or acetic acid. Compared with the prior art, the method has the advantages that nano nickel is used as a catalyst to recycle carbon dioxide, and reaction condition is mild; catalytic selectivity is high, only methanoic acid or acetic acid is produced, and both methanoic acid and acetic acid are chemical materials and have high application value; catalysis efficiency is high, the influence of pH value on catalysis activity is small, equipment is simple, and cost is low.

Description

technical field [0001] The invention belongs to the field of resource reuse, and in particular relates to a method for recycling carbon dioxide. Background technique [0002] At present, energy shortage and environmental pollution are two major problems faced by human beings. The massive emission of carbon dioxide due to the excessive consumption of fossil fuels causes environmental pollution, but it is also a potential carbon resource. How to effectively realize its resource utilization is one of the important topics that are generally concerned by all countries. [0003] The resource utilization of carbon dioxide is mainly through chemical methods to directly reduce it to useful chemical products such as alkanes, formaldehyde, methanol, ethanol, formic acid, acetic acid, and urea. However, the reduction of carbon dioxide requires high energy and provides an electron donor, such as the high-energy reducing agent H 2 , carbon ions or external energy (light energy), etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/00C07C53/02B01J23/755B01J35/10
CPCC07C51/00B01J23/755B01J35/393B01J35/613B01J35/615C07C53/02Y02P20/584
Inventor 穆杨何传书张杰李磊俞汉青
Owner UNIV OF SCI & TECH OF CHINA
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