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A kind of preparation technology of high-efficiency flue gas mercury removal adsorbent

A preparation process and technology of adsorbent, applied in the field of adsorbent preparation, can solve problems such as affecting the activity, and achieve the effect of overcoming the agglomeration of active centers and avoiding the agglomeration of nano-carrier particles

Active Publication Date: 2022-04-19
合肥净龙环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-temperature treatment process will lead to the aggregation of nanoscale active centers and nanoscale supports, which will seriously affect the activity.

Method used

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  • A kind of preparation technology of high-efficiency flue gas mercury removal adsorbent
  • A kind of preparation technology of high-efficiency flue gas mercury removal adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put nano-sized ceria into a low-temperature plasma reactor, fix ceria so that it is in the discharge area; flow hydrogen into the reactor at a flow rate of 20mL / min at room temperature, and stop after 2 hours of discharge at a certain power ; Fully mix cerium oxide with a certain amount of nitrate solution, soak at room temperature for 12 hours, and then dry at 100°C until the water evaporates completely to obtain an adsorbent precursor with a loading capacity of 2.5%; put the precursor into In the plasma reactor, nitrogen gas was introduced at a flow rate of 20 mL / min, and the discharge power was 20 W for 2 h to obtain a nanoscale ceria adsorbent loaded with active centers. The obtained adsorbent was subjected to simulated flue gas demercuration experiment. Table 1 shows the effect of different discharge powers on the mercury removal efficiency of the adsorbent when dealing with oxygen defects.

[0019] Table 1 Effect of different nitrates on the mercury removal effic...

Embodiment 2

[0022] Put nano-sized ceria into a low-temperature plasma reactor, fix ceria so that it is in the discharge area; flow hydrogen into the reactor at a flow rate of 20mL / min at room temperature, and stop after 2 hours of discharge at a certain power ; Fully mix cerium oxide with a certain amount of cobalt nitrate solution, impregnate at room temperature for 12 hours, and then dry at 100°C until the water evaporates completely to obtain an adsorbent precursor with a loading capacity of 2.5%; put the precursor into In the plasma reactor, nitrogen gas was introduced at a flow rate of 20 mL / min, and the discharge power was 20 W for 2 h to obtain a nano-scale ceria adsorbent loaded with active center cobalt. The obtained adsorbent was subjected to simulated flue gas demercuration experiment. The effects of different discharge powers on the mercury removal efficiency of adsorbents when dealing with oxygen defects are shown in Table 2.

[0023] Table 2 Effects of different discharge p...

Embodiment 3

[0027] Put nano-scale ceria into a low-temperature plasma reactor, fix ceria so that it is in the discharge area; pass hydrogen gas into the reactor at a certain flow rate at room temperature, and stop after 2 hours of discharge at 10W power; Fully mix cerium oxide with a certain amount of cobalt nitrate solution, impregnate at room temperature for 12 hours, and then dry at 100°C until the water evaporates completely to obtain an adsorbent precursor with a loading capacity of 2.5%. Put the precursor into the plasma at room temperature Nitrogen was introduced into the bulk reactor at a flow rate of 20 mL / min, and the discharge power was 20 W for 2 h to obtain a nano-scale ceria adsorbent with cobalt as the active center. The obtained adsorbent was subjected to simulated flue gas demercuration experiment. The effects of different hydrogen flow rates on the mercury removal efficiency of the adsorbent when dealing with oxygen defects are shown in Table 3.

[0028] Table 3 Effects...

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Abstract

The invention discloses a preparation process of an efficient flue gas mercury removal adsorbent. Firstly, the commercial nano ceria is plasma-treated in a hydrogen atmosphere to generate oxygen vacancies on the surface, and the nano ceria material with oxygen vacancies is impregnated with the nitrate solution to obtain the adsorbent precursor, and then the low-temperature plasma is used again Bulk discharge technology, using nitrogen as the carrier gas, under high-voltage discharge conditions, the high-energy free radicals collide with the precursor material to make the active center occupy the oxygen vacancies on the surface of ceria, thus obtaining MOx / ceria with good dispersion mercury sorbent. The preparation method provided by the invention further improves the mercury removal efficiency by using metal oxides to occupy the oxygen vacancies on the surface of nano ceria, and at the same time overcomes the problems such as the agglomeration of active centers on the surface of the adsorbent caused by the traditional preparation method, and has important industrial significance. Applied meaning.

Description

technical field [0001] The invention belongs to the field of adsorbent preparation, and relates to a preparation process of an efficient flue gas mercury removal adsorbent, in particular to a technology for preparing a mercury removal adsorbent by low-temperature plasma. Background technique [0002] Mercury is a toxic heavy metal that is liquid at room temperature. In nature, mercury exists in three main forms: elemental mercury, inorganic mercury and organic mercury. Among them, elemental mercury is highly volatile and insoluble in water, so it is difficult to remove and can exist in the atmosphere for a long time. Mercury in the environment can enter the human body through breathing, eating, or skin contact, causing certain harm to the human nervous system, heart, and liver. Mercury emission sources are mainly divided into natural activity emission sources and anthropogenic emission sources. Coal-fired electricity is one of the main fixed sources of atmospheric mercury ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06B01J20/30B01D53/02
CPCB01J20/06B01D53/02B01D2258/0283B01D2257/602
Inventor 徐赫项权沂金晓勇张蕾王卉周洁
Owner 合肥净龙环保科技有限公司
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