Method for preparing denitrification catalyst with metatitanic acid as raw material in one step

A denitration catalyst, metatitanic acid technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc. High temperature activity, simplified preparation process and high catalytic activity

Active Publication Date: 2015-03-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Chinese patent 201110034711.7 discloses a method for preparing a denitrification catalyst. The step is to mix the catalyst powder with water and silica sol to make a catalyst slurry, but it does not mention how to prepare the catalyst. According to the analysis of the existing technology, the catalyst The powder still needs to be roasted after impregnating titanium dioxide with tungsten-containing salt solution and vanadium-containing salt solution, and the process is also complicated.

Method used

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  • Method for preparing denitrification catalyst with metatitanic acid as raw material in one step
  • Method for preparing denitrification catalyst with metatitanic acid as raw material in one step
  • Method for preparing denitrification catalyst with metatitanic acid as raw material in one step

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Experimental program
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Effect test

Embodiment 1

[0027] Ammonia washing treatment of metatitanic acid

[0028] Put 300g of metatitanic acid into a beaker, add 500mL of water and stir, then add 70mL of 25% concentrated ammonia water to adjust the pH to about 9.5. The mixture was transferred into a three-necked flask, and stirred under reflux at 95° C. for 3 hours. The mixture was separated from liquid to solid by filtration, and the filter cake was washed three times with 500 mL of deionized water each time, and then dried in an oven at 120° C. for 12 hours to obtain metatitanic acid after ammonia washing.

Embodiment 2

[0030] Take 3.2g of ammonium metavanadate, 1.16g of ethanolamine, and 4.4g of ammonium paratungstate and dissolve them in water to form a 45mL solution, mix them with 30g of ammonia-washed metatitanic acid, put them into a ball mill and mill them for 3 hours to obtain a catalyst slurry. Cut 400cpsi cordierite honeycomb ceramics into small pieces of Φ1.4×2.2cm, weigh them and immerse them in the obtained catalyst slurry, take them out after 30 seconds, blow off the remaining slurry in the channels with hot air, and then dry them in a microwave oven For 3 minutes, repeat this process once more to obtain a coated catalyst twice, and heat up to 500°C in a muffle furnace at a rate of 2°C / min for 2 hours to obtain a monolithic denitration catalyst. After taking out and weighing, the catalyst coating weight was measured to be 0.631g.

[0031] The method for testing the denitrification activity of the prepared catalyst is: put the monolithic coating catalyst into a quartz tube, and th...

Embodiment 3

[0033] The preparation of the catalyst slurry is the same as in Example 2. Cut 400cpsi cordierite honeycomb ceramics into small pieces of Φ1.4×2.2cm, weigh them and immerse them in the obtained catalyst slurry, take them out after 30 seconds, blow off the remaining slurry in the channels with hot air, and then dry them in a microwave oven For 3 minutes, repeat this process 2 more times to obtain a coated catalyst for 3 times, and heat up to 500°C in a muffle furnace at a rate of 2°C / min for 2 hours to obtain a monolithic denitration catalyst. After taking out and weighing, it is measured that the weight of the catalyst coating is 1.1938g.

[0034] The method for testing the denitrification activity of the prepared catalyst is: put the monolithic coating catalyst into a quartz tube, and the reaction atmosphere is: 500ppm NO+500ppm NH 3 +5%O 2 +N 2 , adjust the feed gas flow rate so that the reaction space velocity is 30000hr -1 . Separately detect NO and NO at import and e...

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Abstract

A method for preparing a denitrification catalyst with metatitanic acid as a raw material in one step. In the method, with the metatitanic acid as the raw material and through desulfuration by ammonia water, a catalyst slurry material is prepared with addition of a mixed solution containing vanadium and tungsten, a silicon sol and deionized water after grinding, and then the catalyst slurry material is used for impregnating a honeycomb ceramic supporter and a drying and roasting process is carried out to obtain the denitrification catalyst. In the method of the denitrification catalyst, only one roasting step is included so that the method is simple and environmental-protective. A prepared monolithic catalyst is excellent in denitrification activity and is greatly reduced in production cost.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a method for preparing a denitration catalyst by using metatitanic acid as a raw material in one-step method. Background technique [0002] A diesel engine is an engine that uses lean burn technology. Compared with traditional gasoline engines, diesel engines have high combustion efficiency, good fuel economy, low concentrations of CO and HC compounds in exhaust gas and low greenhouse gas CO 2 It has many advantages such as low emission, so its share in the automotive engine market is increasing year by year, and it is widely used in trucks, buses, and various special vehicles. However, the application of lean burn technology cannot reduce nitrogen oxides (NO x ) emissions, NO x It has become one of the main pollutants in diesel engine exhaust and must be effectively treated. For diesel exhaust NO x There are two main methods of air pollution control, in-m...

Claims

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Application Information

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IPC IPC(8): B01J37/02B01J23/30B01D53/86B01D53/56
Inventor 王树东程昊张纯希王璇
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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