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A kind of anti-thiomercuric oxidation catalyst and preparation method thereof, flow electrode device

A flow electrode, mercury oxidation technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problems that need to be further improved, and achieve excellent zero-valent mercury The effect of oxidation ability, wide application range, simple and controllable method

Active Publication Date: 2022-07-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Existing mercury oxidation catalysts usually have a composite structure, such as the catalyst disclosed in CN102698753A, which is a copper-based composite oxide catalyst and / or a copper-based composite halide catalyst, or a carrier-supported structure, such as the mercury oxidation catalyst disclosed in CN102470345A, which uses TiO 2 Loading V as an active ingredient for the carrier 2 o 5 and MoO 3 , but the anti-sulfur performance or oxidation efficiency of the above-mentioned catalysts needs to be further improved

Method used

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  • A kind of anti-thiomercuric oxidation catalyst and preparation method thereof, flow electrode device
  • A kind of anti-thiomercuric oxidation catalyst and preparation method thereof, flow electrode device
  • A kind of anti-thiomercuric oxidation catalyst and preparation method thereof, flow electrode device

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Embodiment 1

[0048] This embodiment provides a flow electrode device, the schematic diagram of which is as follows: image 3 As shown in a, it includes the left terminal fixing plate, the left current collector, the anode chamber, the cation exchange membrane, the desalination chamber, the anion exchange membrane, the cathode chamber, the right current collector and the Right terminal fixing plate. Among them, the left terminal fixing plate and the right terminal fixing plate are arranged in parallel and opposite (not shown in the figure); the left current collector and the right current collector are both titanium meshes, and the titanium meshes are connected to the wires with titanium sheets; Both the anode chamber and the cathode chamber are formed by hollow plastic flow channels (such as image 3 b), and the anode chamber and the cathode chamber are connected in series; the desalination chamber is formed by a silica gel flow channel between the cation exchange membrane and the anion e...

Embodiment 2

[0051] This embodiment provides an anti-thiomercuric oxidation catalyst, which is CeO with a core-shell structure 2 @CuO, its preparation method is as follows:

[0052] The flow electrode device provided in Example 1 was used to add Na 2 SO 4 CeO 2 The solution is an electrode solution, which enters from the cathode chamber and flows out from the anode chamber, with Cu(NO 3 ) 2 The solution is flowing through the middle desalination chamber. Among them, CeO 2 Solution and Cu(NO 3 ) 2 The concentration of the solution is 37.5g / L; Na 2 SO 4 The concentration in the electrode solution is 12.5g / L; the constant voltage power-on mode is adopted during the reaction, and the voltage is 4.5V; CeO 2 The solution flow rate is about 3mL / min, Cu(NO 3 ) 2 The flow rate was about 2 mL / min, and the reaction time was 6 hours. After the reaction is completed, the electrode liquid flowing out from the anode chamber is separated into solid-liquid, and the obtained solid is washed and...

Embodiment 3

[0066] This embodiment provides an anti-thiomercuric oxidation catalyst, which is CeO with a core-shell structure 2 @CuO, which employs conventional flow electrode setups such as figure 2 ) was prepared, and the preparation process parameters were the same as those in Example 2.

[0067] The resulting CeO 2 The TEM topography of @CuO is shown in Figure 8 shown in b, wherein a is the spherical CeO prepared by the same preparation method as in Example 2 2 TEM morphology image. It can be seen that the uniformity of the catalyst shell layer prepared by using the traditional flow electrode device is worse than that of Example 2.

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Abstract

The invention provides an anti-thiomercuric oxidation catalyst, a preparation method thereof, and a flowing electrode device, wherein the anti-thiomercuric oxidation catalyst is CeO with a core-shell structure 2 @CuO, where CeO 2 is the inner core and CuO is the shell. The catalyst of the present invention has a core-shell structure, in SO 2 It exhibits excellent zero-valent mercury oxidizing ability in the presence of. The present invention also provides a preparation method of the above-mentioned sulfur-mercury oxidation-resistant catalyst, which is prepared by reaction using a flowing electrode method. The method is simple and controllable, and compared with the existing solution precipitation method, a more complete and uniform core-shell structure can be prepared, and the scope of application is wider.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to an anti-thiomercuric oxidation catalyst, a preparation method thereof, and a flow electrode device. Background technique [0002] Mercury, commonly known as mercury, is a heavy metal that can exist in both gaseous and liquid forms at room temperature. Mercury is highly toxic and can migrate and accumulate in the biological chain over long distances, which is extremely harmful to the environment and human health. Among them, the coal-fired industry, non-ferrous metal industry, waste incineration, and cement industry are the main sources of man-made emissions. [0003] Mercury mainly exists in three forms in industrial flue gas: gaseous elemental mercury (Hg 0 ), gaseous active mercury (Hg 2+ ) and particulate mercury (Hg p ), where Hg 0 It is difficult to directly capture and absorb, so Hg 0 The removal of mercury is an important part of solving industrial fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01J37/34B01J37/03B01D53/86B01D53/64
CPCB01J23/83B01J37/348B01J37/031B01D53/8665
Inventor 王书肖许力文吴清茹李国良
Owner TSINGHUA UNIV