Method for preparing Y zeolite catalyst used for denitration of coal fired power plant from coal ash

A technology of coal-fired power plants and molecular sieves, applied in the direction of molecular sieve catalysts, separation methods, chemical instruments and methods, etc., to achieve the effects of low drug prices, good development prospects, and environmental friendliness

Inactive Publication Date: 2012-09-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a method for preparing a denitrification catalyst using fly ash. The waste fly ash of a coal-fired power plant is used as the raw material of the catalyst and the load of common metal ions to prepare a catalyst for catalytic denitrification, which solves the problem caused by the discharge of fly ash. Environmental problems, realized the resource utilization of fly ash

Method used

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  • Method for preparing Y zeolite catalyst used for denitration of coal fired power plant from coal ash
  • Method for preparing Y zeolite catalyst used for denitration of coal fired power plant from coal ash
  • Method for preparing Y zeolite catalyst used for denitration of coal fired power plant from coal ash

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] step one:

[0030] The fly ash of the power plant is calcined at 750°C for 8 hours to remove the residual carbon in the fly ash, and after cooling to room temperature, it is mixed with sodium hydroxide as an activator in a mass ratio of 1:1.2 (g fly ash / g sodium hydroxide ), melted and roasted at 600°C for 6h, cooled to room temperature, added 120ml of water, stirred at 60°C for 24h, aged in a water bath at 60°C for 24h, and put it into a static reaction kettle Crystallization, the crystallization temperature is 100°C, the crystallization time is 24h, the sample in the washing kettle is taken out until it is neutral, dried and roasted in a muffle furnace at 550°C for 6h to obtain a sodium Y molecular sieve, hereinafter referred to as NaY, the crystallinity and productive rate are shown in Table 2;

[0031] Step two:

[0032] The preparation mass fraction is 10% ammonium nitrate (NH 4 NO 3 , analytically pure) solution, weighed 2.0g of sodium-type Y molecular sieve and...

Embodiment 2

[0038] step one:

[0039] The fly ash of the power plant is calcined at 700°C for 10 hours to remove the residual carbon in the fly ash, and after cooling to room temperature, it is mixed with sodium hydroxide as an activator in a mass ratio of 1:1.2 (g fly ash / g sodium hydroxide ), melted and roasted at 620°C for 6h, cooled to room temperature, added 120ml of water, stirred at 60°C for 24h, aged in a water bath at 60°C for 24h, and put it into a static reaction kettle Crystallization, the crystallization temperature is 100°C, and the crystallization time is 24h. Take out the sample in the washing kettle until it is neutral, dry it and roast it in a muffle furnace at 550°C for 6h to obtain a sodium-type Y molecular sieve, which is hereinafter referred to as NaY-1. Crystallinity and yield are shown in Table 2;

[0040] Step two:

[0041] The preparation mass fraction is 10% ammonium nitrate (NH 4 NO 3 , analytically pure) solution, weighed 2.0g of NaY-1 and added 150ml of a...

Embodiment 3

[0045] step one:

[0046] The fly ash of the power plant is calcined at 700°C for 10 hours to remove the residual carbon in the fly ash. After cooling to room temperature, it is mixed with sodium hydroxide as an activator in a mass ratio of 1:1.4 (g fly ash / g sodium hydroxide ), melted and roasted at 620°C for 6h, cooled to room temperature, added 150ml of water, stirred at 60°C for 24h, aged in a water bath at 60°C for 24h, and put it into a static reaction kettle. Crystallization, the crystallization temperature is 100°C, and the crystallization time is 24h. Take out the sample in the washing kettle until it is neutral, dry it and roast it in a muffle furnace at 550°C for 6h to obtain a sodium-type Y molecular sieve, which is hereinafter referred to as NaY-2. Crystallinity and yield are shown in Table 2;

[0047] Step two:

[0048] The preparation mass fraction is 8% ammonium nitrate (NH 4 NO 3 , analytically pure) solution, weighed 2.0g of sodium-type Y molecular sieve ...

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Abstract

The invention which relates to the field of denitration in a coal fired power plant discloses a method for preparing a Y zeolite catalyst used for denitration of the coal fired power plant from coal ash. The method comprises the following steps: calcining a solid waste coal ash of the coal fired power plant in a muffle furnace, and fusing with sodium hydroxide at a high temperature; and stirring with heating in a water bath, carrying out hydrothermal crystallization on the obtained mixed solution, washing with water to neutrality, drying, and roasting to obtain zeolite raw powder. The zeolite catalyst with a certain catalytic activity is obtained through combining the special tunnel structure of the zeolite material and carrying out ion loading, and is applied to the denitration of the coal fired power plant. The method allows the catalyst for the denitration of the power plant to be obtained through using the waste coal ash as a raw material, and synthesizing and modifying the zeolite, so the utilization prospect of the coal ash is broadened, and the resource utilization of the coal ash is realized, thereby the method is a new green production method which can satisfy sustainable development requirements.

Description

technical field [0001] The invention relates to a method for preparing Y-type molecular sieves from fly ash and modifying them for catalytic denitrification in coal-fired power plants, which provides a new application for the zeolite molecular sieve prepared from fly ash. Background technique [0002] In recent years, with the advancement of science and technology and the development of industry, coal as a fossil fuel occupies a pivotal position in the proportion of fuel in my country, and the emission of fly ash, a derivative of coal, is also increasing year by year. At present, most of fly ash is used for In the construction industry with low added value such as cement and concrete, most of them are still piled up or landfilled, which not only takes up a lot of valuable land resources but also easily causes secondary pollution. An effective way of resource utilization of fly ash. The main component of fly ash is aluminosilicate, which contains the silicon and aluminum sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/14B01J29/16B01J29/08B01D53/56B01D53/86
Inventor 张润铎李文迪陈标华
Owner BEIJING UNIV OF CHEM TECH
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