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High-sulfur-resistance zirconium-based pillared clay supported catalyst as well as preparation method and application thereof

A supported catalyst and pillared clay technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problem of irreversible deactivation of catalysts, achieve high sulfur resistance and alleviate poisoning effects.

Pending Publication Date: 2022-08-05
SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a large amount of SO in coal-fired flue gas 2 , SO in flue gas 2 It will react with transition metals on the surface of the catalyst to generate sulfate, resulting in irreversible deactivation of the catalyst

Method used

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  • High-sulfur-resistance zirconium-based pillared clay supported catalyst as well as preparation method and application thereof
  • High-sulfur-resistance zirconium-based pillared clay supported catalyst as well as preparation method and application thereof
  • High-sulfur-resistance zirconium-based pillared clay supported catalyst as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0030] On the one hand, the embodiments of the present application provide a method for preparing a high-sulfur-resistant zirconium-based pillared clay-supported catalyst, which includes the following steps:

[0031] S1, a bentonite suspension with a mass fraction of 0.5-2% and a zirconium oxynitrate cross-linking agent with a concentration of 0.1-0.5 mol / L are configured.

[0032] Wherein, the preparation method of bentonite suspension is as follows: put 5-20g bentonite into a 1L beaker, add 980-995g deionized water as a solvent, and stir at room temperature for 24h to obtain a bentonite suspension with a mass fraction of 0.5-2% liquid.

[0033] The method for preparing zirconium oxynitrate cross-linking agent using zirconium oxynitrate as a zirconium source is as follows: aging 0.1 mol / L zirconium oxynitrate in a constant temperature water bath at 75~90℃ for 3~10h, and then standing for 2~5h to cool down, A zirconium oxynitrate crosslinking agent with a concentration of 0.1...

Embodiment approach

[0042] It includes the following steps:

[0043] S1, configure a bentonite suspension with a mass fraction of 1% and a zirconium oxynitrate crosslinking agent with a concentration of 0.1 mol / L.

[0044] Among them, the preparation method of bentonite suspension is as follows: put 10g bentonite into a 1L beaker, add 990g deionized water as a solvent, and stir at room temperature for 24h to obtain a bentonite suspension with a mass fraction of 1%.

[0045] The method for preparing zirconium oxynitrate crosslinking agent using zirconium oxynitrate as zirconium source is as follows: aging 0.1 mol / L zirconium oxynitrate in a constant temperature water bath at 85°C for 5 hours, and then standing to cool for 3 hours to obtain a concentration of 0.1 mol / L L's zirconium oxynitrate crosslinker.

[0046] The prepared zirconium oxynitrate crosslinking agent is slowly added dropwise to the fully dispersed bentonite suspension to obtain a first mixed solution, ensuring that the concentrati...

Embodiment 1

[0061] 6%MnO 2 -6% CeO 2 / Zr-PILC catalyst preparation and performance testing.

[0062] Put 10 g of bentonite into a 1L beaker, add 990 g of deionized water as a solvent, and stir at room temperature for 24 hours to obtain a bentonite suspension with a mass fraction of 1%.

[0063] Use zirconium oxynitrate as zirconium source to prepare zirconium oxynitrate cross-linking agent: prepare 0.1 mol / L zirconium oxynitrate solution, age it in a constant temperature water bath at 85°C for 5 hours, and then stand for 3 hours to cool down to obtain a concentration of 0.1 mol / L L's zirconium oxynitrate crosslinker.

[0064] The prepared zirconium oxynitrate crosslinking agent is slowly added dropwise to the fully dispersed bentonite suspension to obtain a first mixed solution, ensuring that the concentration of zirconium oxynitrate in the first mixed solution is 15mmol / g , stir for 6h at room temperature, and then stand for 12h, so that the zirconium oxynitrate crosslinking agent and...

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Abstract

The invention provides a high-sulfur-resistance zirconium-based pillared clay supported catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a carrier Zr-PILC from bentonite turbid liquid and a zirconyl nitrate cross-linking agent; the preparation method comprises the following steps: dissolving Zr-PILC in deionized water, dissolving Mn (NO3) 2 and Ce (NO3) 4 in deionized water, adding a carrier Zr-PILC, stirring and dipping, and drying, calcining and grinding a dipping product to obtain the high-sulfur-resistance zirconium-based pillared clay supported catalyst. According to the preparation method disclosed by the invention, the prepared zirconium pillared clay (Zr-PILC) has a high specific surface area, so that Ce and Mn active substances can be loaded by taking the zirconium pillared clay as a carrier, and then the pillared clay loaded catalyst is synthesized. According to the pillared clay supported catalyst prepared by the preparation method disclosed by the invention, on one hand, NOx and Hg < 0 > in coal-fired flue gas are efficiently and synergistically removed by utilizing the characteristic of strong catalytic ability of Ce and Mn active substances, and on the other hand, the high sulfur resistance characteristic of Zr-PILC is fully exerted, and the poisoning effect of SO2 in the flue gas on the catalyst is greatly relieved.

Description

technical field [0001] The invention relates to the field of air pollution control, in particular to a high-sulfur-resistant zirconium-based pillared clay-supported catalyst and a preparation method and application thereof. Background technique [0002] Coal combustion flue gas is considered to be an important anthropogenic source of various air pollutants. Mercury (Hg) pollution has become a global environmental problem due to its persistence, volatility, ease of migration, and high bioaccumulation. Most of the mercury in coal-fired flue gas is elemental mercury (Hg 0 ) form exists, and due to its volatility and insoluble in water, it is difficult to be removed by the existing pollutant control systems of coal-fired power plants. Studies have shown that SCR denitration system can reduce Hg in coal-fired flue gas 0 Oxidized to Hg 2+ , and then remove mercury in flue gas through wet desulfurization device and dust removal device to achieve nitrogen oxides (NO x ) and Hg ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/16B01J23/34B01D53/86B01D53/56B01D53/64
CPCB01J21/16B01J23/34B01D53/8628B01D53/8665Y02A50/20
Inventor 何川张发捷李昂卢承政王丽朋李乐田吴国勋卞子君孔凡海
Owner SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD
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