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For motor vehicle exhaust no x Process for the preparation of eliminated molecular sieve catalysts

A molecular sieve and catalyst technology, applied in the field of molecular sieve catalyst preparation, can solve the problems of difficulty in determining the content of active components, complicated steps, and a lot of waste water, and achieve the effects of shortening preparation time, easy steps, and high catalytic efficiency

Active Publication Date: 2017-11-10
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that when the ion exchange method is used for the active components in the preparation process of the molecular sieve catalyst, the steps are complicated, the waste water is much generated and the content of the active components is difficult to determine, and a simple and easy-to-operate method for motor vehicles is provided. Preparation method of molecular sieve catalyst for tail gas NOx elimination

Method used

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  • For motor vehicle exhaust no <sub>x</sub> Process for the preparation of eliminated molecular sieve catalysts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment one: a kind of preparation method of the molecular sieve catalyst that is used for motor vehicle tail gas NOx elimination comprises the steps:

[0020] (1) Test the incipient wetness water absorption of molecular sieves: take 10.0g SSZ-13 molecular sieves and place them in a blast drying oven at 120°C for 4 hours. After cooling in the desiccator, the incipient wetness impregnation method is used to measure the incipient wetness water absorption of molecular sieves to be 11.6g. ;

[0021] (2) 1.21g CuSO 4 ·5H 2 O was dissolved in 4.2g of deionized water to obtain a clear solution, fully mixed the solution and molecular sieve under stirring / dynamic conditions and then sealed and left for 2h; then added 6.0g of deionized water under stirring conditions and mixed evenly, and the resulting product was Dry at 80°C for 12 hours;

[0022] (3) The dried molecular sieve catalyst was calcined in a tube furnace at 550° C. for 4 h at a heating rate of 2° C. / min to obta...

Embodiment 2

[0024] Embodiment two: a kind of preparation method of the molecular sieve catalyst that is used for motor vehicle tail gas NOx elimination comprises the steps:

[0025] (1) Test the incipient wetness water absorption of molecular sieves: place 10.0g of ZSM-5 molecular sieves in a blast oven at 120°C for 5 hours, cool in a desiccator and use the incipient wetness impregnation method to measure the incipient wetness water absorption of molecular sieves to be 9.8g;

[0026] (2) 1.07g Cu(NO 3 ) 2 ·3H 2 O is dissolved in 3.5g of deionized water to obtain a clear solution, and the solution and molecular sieve are fully mixed under stirring / dynamic conditions and then sealed and left for 2h; Dry at ℃ for 4 hours;

[0027] (3) The dried molecular sieve catalyst was calcined in a tube furnace at 550° C. for 4 h at a heating rate of 0.5° C. / min to obtain a molecular sieve catalyst Cu / ZSM-5 with a target copper content of 2.8 wt.%.

Embodiment 3

[0028] Embodiment three: a kind of preparation method of the molecular sieve catalyst that is used for motor vehicle tail gas NOx elimination comprises the steps:

[0029] (1) Test the incipient wetness water absorption of molecular sieves: place 10.0g of ZSM-5 molecular sieves in a blast oven at 105°C for 5 hours, cool in a desiccator and use the incipient wetness impregnation method to measure the incipient wetness water absorption of molecular sieves to be 9.8g;

[0030] (2) 1.35g Cu(CH 3 COO) 2 ·H 2 Dissolve O in 6.0g of deionized water, heat to 50°C to obtain a clear solution, fully mix the solution and molecular sieves under stirring / dynamic conditions, seal and let stand for 2 hours; then add 2.5g of deionized water under stirring conditions and mix well , drying the obtained product at 120°C for 5 hours;

[0031] (3) The dried molecular sieve catalyst was calcined in a tube furnace at 550° C. for 4 hours at a heating rate of 5° C. / min to obtain a molecular sieve cat...

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Abstract

The invention relates to a preparation method of a molecular sieve based catalyst for eliminating NOx in vehicle exhaust. The preparation method comprises the following steps: firstly, measuring the incipient-wetness water absorption amount of a molecular sieve to confirm the amount of deionized water used in a loading process; then, dissolving a Cu / Fe metal precursor in the deionized water of which the incipient-wetness water absorption amount is 0.25-0.7 time of that of the molecular sieve to obtain a settled solution, uniformly mixing the settled solution and the molecular sieve under the stirring condition, sealing the mixture for 2 hours' still standing, utilizing a certain amount of deionized water to wet the mixture which is left to stand under the stirring condition, and drying the wet mixture to obtain a primary product of the molecular sieve based catalyst; finally, roasting the obtained primary product through temperature programming to obtain the active metal component Cu / Fe loaded molecular sieve based catalysts. The preparation method is simple, and the preparation steps are easy to perform; the NOx eliminating effect of the obtained molecular sieve based catalyst is similar to that of a catalyst obtained according to the conventional ion-exchange method; the preparation process is high in operability, the utilization ratio of metal salt is high, and nearly no wastewater is generated.

Description

technical field [0001] The invention relates to a preparation method of a molecular sieve catalyst used for eliminating NOx of motor vehicle tail gas, and belongs to the technical field of molecular sieve catalyst preparation. Background technique [0002] From January 1, 2015, my country's diesel vehicles fully implement the National IV emission standards, and the elimination of nitrogen oxides (NOx) mainly uses NH 3 -SCR technology, that is, ammonia (or NH produced by urea decomposition) 3 ) as reducing agent, NOx selective catalytic reduction (Selective Catalytic Reduction) to nitrogen and water (N 2 +H 2 O). The catalysts mainly used in the National IV and National V regulations are traditional vanadium-titanium catalysts. Because vanadium is unstable and volatile at high temperature and has strong toxicity itself, vanadium-titanium catalysts have been banned from being used in motor vehicles in the United States and Japan. Exhaust harmful substances are eliminated. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/76B01J29/46B01J29/85B01D53/56B01D53/94
Inventor 金炜阳任衍伦吕衍安施文杰岳军贾莉伟王家明
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST