Carbocoal-based photo-catalytic oxidation fuel gas desulfurization and denitration agent and preparation method thereof

A technology of photocatalytic oxidation and denitration agent, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high energy consumption, high price, serious catalyst wear, etc. cheap effect

Inactive Publication Date: 2014-05-21
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: (1) the catalyst is expensive TiO 2 base, economically unreasonable; (2) NH must be strictly controlled 3 stoichiometric ratio to NO, otherwise unreacted NH 3 Will cause secondary pollution, in addition to NH 3 The equipment corrosion problem caused by leakage is difficult to avoid and overcome; (3) SCR reaction temperature must generally be above 200°C, and NSCR technology must be above 700°C, which is not well matched with the temperature of the electrostatic precipitator, resulting in serious wear and tear on the catalyst by dust. Higher energy consumption; (4) SO 2 NO x Has a promoting effect, removes NO x It needs to be installed before desulfurization, causing the equipment to be easily corroded and dust-etched; (5) The operating conditions are harsh, and the gas source needs to be pretreated to prevent catalyst poisoning
Most of the catalysts disclosed in domestic denitrification patents use the SCR method, and there are few desulfurization and denitrification agents that can be used in low-temperature catalytic oxidation technology

Method used

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  • Carbocoal-based photo-catalytic oxidation fuel gas desulfurization and denitration agent and preparation method thereof
  • Carbocoal-based photo-catalytic oxidation fuel gas desulfurization and denitration agent and preparation method thereof
  • Carbocoal-based photo-catalytic oxidation fuel gas desulfurization and denitration agent and preparation method thereof

Examples

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Embodiment 1～5

[0031] 100g of 4-10 mesh particles obtained after sieving semi-coke and 5.0% H 2 o 2 The solution was mixed with a liquid-solid ratio of 1.5, placed in a 500ml round-bottomed flask, kept in an ultrasonic environment at 80°C for 2h, and dried at 110°C for 2h; then mixed with 45% HNO 3 After mixing at a liquid-solid ratio of 2, treat at 80°C for 2 hours, wash with water until neutral, and then dry at 110°C for 2 hours; then mix the semi-finished semi-coke catalyst obtained in the above steps with 5.0% ammonia water at a liquid-solid ratio of 2 , treated at 40°C for 2 hours, washed with water until neutral and then dried at 110°C for 2 hours; then, the semi-finished semi-coke catalyst obtained in the above steps was divided into 4 parts on average, 1 part was marked as A, and the other 3 parts were added to 30ml tetrabutyl titanate Dissolve the ester in 100ml of absolute ethanol and stir at 35°C for 2 hours, place it for 6 hours, dry at 110°C for 4 hours, and roast at 350°C for ...

example 6～7

[0036] After sieving the semi-coke, 100g of 10-40 mesh particles were mixed with distilled water, 20.0% H 2 0 2 The solution was mixed at a liquid-solid ratio of 1.5, placed in a 500ml round bottom flask, kept in an ultrasonic environment of 150-300w for 2h, and dried at 110°C for 2h; then mixed with 40.0% H 2 SO 4 The solution was mixed according to the liquid-solid ratio of 3.0, treated at 80°C for 2h, washed with water until neutral and then dried at 110°C for 2h; 2 CO 3 The solution is mixed according to the liquid-solid ratio of 3.0, treated at 100°C for 1h, washed with water until neutral, and then dried at 110°C for 2h; then the semi-finished semi-coke catalyst obtained in the above steps is dissolved in 30ml of tetrabutyl titanate in 100ml of absolute ethanol After stirring at 40°C for 2h, soak in the solution obtained for 6h, and dry at 110°C for 6h to prepare the precursor of modified semi-coke photocatalytic adsorption desulfurization and denitrification agent. ...

example 8～13

[0042] After sieving the semi-coke, 100g of particles of 10-40 mesh and 15.0% H 2 o 2 The solution was mixed with a liquid-solid ratio of 1.5, placed in a 500ml round bottom flask, kept in a 150-300w ultrasonic environment for 2h, and dried at 110°C for 2h; then mixed with 40.0% HNO 3 Solution, 20.0% HNO 3Mix with 20.0% HCl mixed solution at a solid-to-liquid ratio of 2.0, react at 80°C for 2h, wash with water until neutral and then dry at 110°C for 2h, the semi-finished semi-coke catalysts obtained are respectively marked as G and H; KOH, 10.0% NaOH and 10.0% KOH mixed solution, a certain concentration of MDEA solution are mixed at a liquid-solid ratio of 1.5, kept at 100°C for 1h, washed with water to neutral 110°C and dried for 2h, after that, at 3-25% water vapor content and Under the condition of 2-15% oxygen content, activated at a temperature of 500-700°C, the semi-finished products of semi-coke catalysts are respectively recorded as G-K, G-K-Na, G-M, H-K, H-K-Na, H-M...

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Abstract

The invention discloses a carbocoal-based photo-catalytic oxidation fuel gas desulfurization and denitration agent and a preparation method thereof. The preparation method is characterized in that carbon-containing materials such as lignite carbocoal, anthracitic coal and bituminous coal carbocoal take amorphous or formed particle carbocoal, tetrabutyl titanate, absolute ethyl alcohol and the like as photo-catalyst active raw materials; firstly, the amorphous or formed particle carbocoal supports a photo-catalyst TiO2, transition metal oxide and the like through methods of ultrasonic activation of hydrogen peroxide, acid activation, alkaline activation and the like, and subsequently, the amorphous or formed particle carbocoal is activated by water vapour at a high temperature of 500-700 DEG C and then mechanically mixed with ZSM-5 or other NO adsorption molecular sieves, thereby finally obtaining the photo-catalytic desulfurization and denitration agent. The carbocoal-based photo-catalytic oxidation fuel gas desulfurization and denitration agent has the characteristics of extensive sources and low price of active carbocoal; after TiO2 is supported, the carbocoal-based photo-catalytic oxidation fuel gas desulfurization and denitration agent has the effect of getting twice the result with half the effort during denitration; the ZSM-5 and other NO absorption molecule sieves can play the role of capturing NO; the prepared catalyst can be used for removing NOx in fuel gas of coal-fired power plants, coal-fired boilers, coal-fired kilns and the like through a low-temperature photo-catalytic oxidation method at a temperature which is less than or equal to 110 DEG C; the prepared catalyst also can be used for removing NOx in ventilated gases generated in road tunnels, underground parking garages, street intersections and the like.

Description

technical field [0001] The invention relates to a method for removing NO in flue gas by using photocatalytic oxidation method x The adsorption catalyst and its preparation technology, more specifically, a metal oxide and TiO 2 , and the preparation technology of active semi-coke-based photocatalytic oxidation denitrification adsorption catalyst mechanically mixed with molecular sieves. Background technique [0002] NO in the national coal-fired flue gas x It is one of the main pollutants of the atmospheric environment. From the year-by-year detection situation in my country, since the 1990s, the concentration and deposition of nitrate in rainfall are gradually increasing, the ratio of nitrate to sulfate in precipitation is changing, and the acid rain in China is heading toward H 2 SO 4 with HNO 3 Mixed acid rain transition. In Beijing, Guangzhou, Pearl River Delta, Hong Kong and other places, NO x The concentration has exceeded the SO 2 . According to the statistics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01J29/70B01J20/18B01D53/86B01D53/60
CPCY02A50/20Y02C20/30
Inventor 李春虎孙圣楠郑昱王群冯丽娟卞俊杰王亮李子真
Owner OCEAN UNIV OF CHINA
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