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Carbon aerogel microspheres for adsorbing carbonyl sulfide and mercury and preparation method thereof

A technology of carbon aerogel and carbonyl sulfide, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems that desulfurizers do not have good renewable performance and are not suitable for high space velocity conditions, and achieve resource regeneration , high removal efficiency, clean and efficient preparation method

Pending Publication Date: 2021-07-02
卡伯恩(苏州)复合材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the current research on the removal of COS and Hg from natural gas mainly uses different catalysts to remove a single substance, and each catalyst also has corresponding shortcomings.
For example, the application number CN201610777977.3 discloses a fine iron oxide desulfurizer and its preparation and application method. The desulfurization precision and sulfur capacity of the desulfurizer are high. The production process of the fine desulfurizer is simple, but the desulfurizer does not have good renewability And does not apply to high airspeed conditions

Method used

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  • Carbon aerogel microspheres for adsorbing carbonyl sulfide and mercury and preparation method thereof
  • Carbon aerogel microspheres for adsorbing carbonyl sulfide and mercury and preparation method thereof
  • Carbon aerogel microspheres for adsorbing carbonyl sulfide and mercury and preparation method thereof

Examples

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Embodiment 1

[0042] This example provides a method for preparing a nitrogen-doped modified carbon airgel material for synergistic removal of carbonyl sulfide and mercury in natural gas. The carbon airgel material is made of sodium alginate after nitrogen doping The porous high specific surface area carbon material is a carrier, loaded active metal Sn-Cu; Described method is to carry out as follows:

[0043] (1) Dissolve 2g of sodium alginate completely in 100ml of deionized water. Add 1g of urea and configured Sn to the mixture 4+ 、Cu 2+ Nitrate solution, stirred at 60°C for 6h to obtain a nitrogen-doped hydrogel loaded with metal ions;

[0044] (2) The hydrogel obtained above was rinsed with deionized water for 6 times and then placed in a freeze dryer, dried at -30°C for 24 hours to obtain an airgel, and then the obtained airgel was placed in a tube furnace at 100% N 2 The metal oxide-supported nitrogen-doped carbon airgel adsorption material was prepared by carbonization at 700°C (h...

Embodiment 2

[0051] The difference between this embodiment and embodiment 1 is that the carbonization temperature in step (2) is 900°C.

[0052] The COS and Hg removal activity evaluation experiments were carried out on the carbon airgel material prepared in this example. The experimental results show that the removal efficiency of COS can reach 89%, and the removal efficiency of Hg can reach 87%.

Embodiment 3

[0054] The difference between this embodiment and embodiment 1 is that the carbonization temperature in step (2) is 500°C.

[0055] The COS and Hg removal activity evaluation experiments were carried out on the carbon airgel material prepared in this example. The experimental results show that the removal efficiency of COS can reach 91%, and the removal efficiency of Hg can reach 90%.

[0056] Such as figure 1 As shown, it can be seen from Examples 1 to 3 that the carbonization temperature of the present invention should be controlled at 700 ° C during the preparation of carbon airgel materials, and different carbonization temperatures play an important role in the formation of the carbon material pore structure during the preparation of coal tar materials. The quality of the pore structure of the material is closely related to the subsequent metal loading, which ultimately affects the efficiency of its catalyst for synergistic removal of COS and Hg.

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Abstract

The invention provides carbon aerogel microspheres for adsorbing carbonyl sulfide and mercury and a preparation method of the carbon aerogel microspheres, and relates to the field of natural gas treatment. The carbon aerogel microsphere for adsorbing carbonyl sulfide and mercury comprises a core layer and a shell layer, the core layer comprises Sn-Cu active metal, and the core layer comprises nitrogen-doped carbon aerogel prepared by taking sodium alginate as a raw material. The preparation method of the carbon aerogel microspheres for adsorbing carbonyl sulfide and mercury comprises the following steps: completely dissolving sodium alginate in deionized water, adding a nitrogen-containing cross-linking agent, Sn < 4 + > salt and Cu < 2 + > salt, and stirring and mixing to form hydrogel microspheres; and washing the hydrogel microspheres with deionized water, carrying out freeze drying, and carrying out high-temperature carbonization treatment in an N2 atmosphere to obtain the carbon aerogel microspheres for adsorbing carbonyl sulfide and mercury. The carbon aerogel microspheres for adsorbing carbonyl sulfide and mercury, provided by the invention, are low in cost, are modified by nitrogen doping, are loaded with Sn / Cu active metals, and are high in removal efficiency.

Description

technical field [0001] The invention relates to the field of natural gas treatment, in particular to a carbon airgel microsphere for adsorbing carbonyl sulfide and mercury and a preparation method thereof. Background technique [0002] Due to its high efficiency and environmental protection, natural gas is developing rapidly in recent years to meet the growing demand for clean energy for sustainable development. However, a certain amount of acid gas (H 2 S and COS, etc.) and mercury. Among them, if COS is not treated, it will lead to the corrosion of the pipeline and the poisoning of the catalyst in the catalytic processing of natural gas. Mercury in natural gas mainly exists in the form of HgO, and the accumulation of HgO can easily corrode aluminum heat exchangers through amalgam corrosion and liquid metal embrittlement mechanisms, leading to plant failures and accidents. [0003] The desulfurization methods of natural gas can be divided into dry method and wet method. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01D53/02
CPCB01J20/20B01J20/28016B01J20/28047B01D53/02B01D2257/308B01D2257/602
Inventor 张华伟
Owner 卡伯恩(苏州)复合材料有限公司
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