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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  • 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. Accord

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

Examples

Experimental program
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Example Embodiment

[0026] Example 1

[0027] Ammonia washing treatment of metatitanic acid

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

Example Embodiment

[0029] Example 2

[0030] Take 3.2 g of ammonium metavanadate, 1.16 g of ethanolamine, and 4.4 g of ammonium paratungstate to dissolve in water to prepare a 45 mL solution, mix with 30 g of metatitanic acid after ammonia washing treatment, and add to a ball mill tank for ball milling for 3 hours to obtain catalyst slurry. Cut 400cpsi cordierite honeycomb ceramic into small pieces of Φ1.4×2.2cm, weigh and immerse in the obtained catalyst slurry, take out after 30 seconds, blow off the remaining slurry in the pores with hot air, and then dry it in a microwave oven For 3 minutes, this process was repeated once to obtain the coated catalyst twice, and the catalyst was heated to 500°C at a rate of 2°C / min in a muffle furnace for 2 hours to obtain an overall denitration catalyst. The weight of the catalyst coating measured after being taken out and weighed was 0.631 g.

[0031] The denitration activity test method of the prepared catalyst is as follows: the integrally coated catalyst is...

Example Embodiment

[0032] Example 3

[0033] The preparation of the catalyst slurry was the same as in Example 2. Cut 400cpsi cordierite honeycomb ceramic into small pieces of Φ1.4×2.2cm, weigh and immerse in the obtained catalyst slurry, take out after 30 seconds, blow off the remaining slurry in the pores with hot air, and then dry it in a microwave oven For 3 minutes, this process was repeated twice to obtain a coated catalyst for three times, and it was heated in a muffle furnace at a rate of 2° C. / min to 500° C. and calcined for 2 hours to obtain an overall denitration catalyst. After being taken out and weighed, the weight of the catalyst coating measured was 1.1938 g.

[0034] The denitration activity test method of the prepared catalyst is as follows: the integrally coated catalyst is put into a quartz tube, and the reaction atmosphere is: 500ppm NO+500ppm NH 3 +5%O 2 +N 2 , Adjust the feed gas flow so that the reaction space velocity is 30000hr -1 . Separately detect NO and NO at import an...

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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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