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Sulfur-resistant mercury oxidation catalyst, preparation method thereof and flowing electrode device

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

Active Publication Date: 2021-06-15
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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  • Sulfur-resistant mercury oxidation catalyst, preparation method thereof and flowing electrode device
  • Sulfur-resistant mercury oxidation catalyst, preparation method thereof and flowing electrode device
  • Sulfur-resistant mercury oxidation catalyst, preparation method thereof and flowing electrode device

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Embodiment 1

[0048] This embodiment provides a flow electrode device, its structural schematic diagram is as follows image 3 As shown in a, it includes the left terminal fixing plate, left current collector, anode chamber, cation exchange membrane, desalination chamber, anion exchange membrane, cathode chamber, right collector and Right side terminal fixing plate. Wherein, the left terminal fixing plate and the right terminal fixing plate are parallel and oppositely arranged (not shown in the figure); the left current collector and the right current collector are both titanium mesh, and the titanium mesh is connected to the wire with a titanium sheet; Both the anode and cathode chambers are formed by hollowed-out plastic channels (such as image 3 shown in 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 exchange membrane, and further includes a nyl...

Embodiment 2

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

[0052] Using the flow electrode device provided in Example 1, to add Na 2 SO 4 CeO 2 The solution is the 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 desalting 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 charging mode is adopted in the reaction process, and the voltage is 4.5V; CeO 2 The solution flow rate is about 3mL / min, Cu(NO 3 ) 2 The flow rate was approximately 2 mL / min, and the reaction time was 6 hours. After the reaction, the electrode liquid flowing out from the anode chamber was separated from solid to liquid, and the obtained solid was washed and dr...

Embodiment 3

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

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

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Abstract

The invention provides a sulfur-resistantmercury oxidation catalyst, a preparation method thereof and a flowing electrode device. The sulfur-resistant mercury oxidation catalyst is CeO2@CuO with a core-shell structure, CeO2 is an inner core, and CuO is a shell layer. The catalyst disclosed by the invention is of a core-shell structure, and shows excellent zero-valent mercury oxidation capacity in the presence of SO2. The invention also provides a preparation method of the sulfur-resistant mercury oxidation catalyst, in which the catalyst is prepared by adopting a flowing electrode method for reaction. The method is simple and controllable, and compared with existing methods such as a solution precipitation method, the method can be used for preparing a relatively complete and uniform core-shell structure and is relatively wide in application range.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to an anti-thiomercury oxidation catalyst, a preparation method thereof, and a flowing electrode device. Background technique [0002] Mercury, commonly known as mercury, is a heavy metal that can exist in gaseous and liquid forms at room temperature. Mercury is highly toxic and can migrate and accumulate in the biological chain for a long distance, which is extremely harmful to the environment and human health. Among them, the coal-burning industry, non-ferrous 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 capture and absorb directly, so Hg 0 The removal of mercury is an important part of solving industrial flue gas ...

Claims

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Application Information

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Patent Type & Authority Applications(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