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Loaded nitrogen oxide purifying catalyst and its preparation

A technology for purifying catalysts and nitrogen oxides, which is applied in the preparation of loaded nitrogen oxides purification catalysts, catalysts and preparations for treating exhaust pollution from diesel vehicles and lean-burn gasoline locomotives, and in the field of air pollution control. It can solve the problems of poor catalyst life, Low catalytic activity, low conversion rate and other problems, to achieve the effect of wide activity temperature range, simple preparation method and good thermal stability

Inactive Publication Date: 2004-01-28
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many literature reports about the selective catalytic reduction research of nitrogen oxides. In the reported nitrogen oxides selective catalytic reduction catalysts, there are the following problems: some are aimed at studying the reaction mechanism, the properties of the catalyst, etc., and their conversion Low rate, such as Pt / Al 2 o 3 , the NO conversion rate of Cu / ZSM-5 is 38%~62% and 33% (R.Burch, J.Catal., 176(1998): 204; B.Ganemi, Appl.Catal.B.17(1998) : 293); although some have higher activity, the life of the catalyst is poor
However, in my country, systematic research work on exhaust nitrogen oxide catalysts for diesel vehicles and lean-burn gasoline locomotives is rare, and there are few patent reports on catalysts for exhaust nitrogen oxides purification for diesel vehicles and lean-burn gasoline locomotives.
We have done some research work on the catalytic conversion of nitrogen oxides (Journal of Catalysis, 2002, 23 (6): 535; Molecular Catalysis, 2000, 14 (5): 354), and applied for a study on Fe-Mo / National invention patent of ZSM-5 catalyst, the catalyst has high catalytic conversion activity and good stability for nitrogen oxides, but the problem is that the catalytic activity is low at low temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Add 1.95 grams of ammonium molybdate to 100 ml of deionized water, stir to dissolve, add an appropriate amount of ammonia water, then add 20 grams of HZSM-5, keep the temperature in a constant temperature water bath at 50 ° C, and stir electrically until the water evaporates to dryness. Dry in an oven at 120°C for 12 hours, then calcinate in a muffle furnace at 550°C for 4 hours, and finally immerse the Mo / ZSM-5 sample in a solution containing 2.51 grams of copper nitrate, and then evaporate to dryness, dry, and roast similarly to the above and so on, a Cu-Mo / ZSM-5(1) catalyst sample with Cu / Mo=1 can be obtained.

[0014] Cu-Mo / ZSM-5(1) in the reaction conditions: NO x 500ppm, NH 3 500ppm, O 2 2%, at a temperature of 380-450°C, its NO x The conversion rate reached 99.6%.

Embodiment 2

[0016] Add 1.95 grams of ammonium molybdate to 150 ml of deionized water, stir to dissolve, add an appropriate amount of ammonia water, then add 20 grams of HZSM-5, keep the temperature in a constant temperature water bath at 60 ° C, and stir electrically until the water evaporates to dryness. Dry in an oven at 120°C for 12 hours, and finally immerse the sample impregnated with Mo in a solution containing 2.52 grams of copper nitrate, then evaporate to dryness, dry, and finally calcinate in a muffle furnace at 550°C for 4 hours, that is Cu-Mo / ZSM-5(2) catalyst samples are available.

[0017] Cu-Mo / ZSM-5(2) in the reaction conditions: NO x 500ppm, NH 3 500ppm, O 2 4% at a temperature of 400°C, its NO x The conversion rate reached 99.5%.

Embodiment 3

[0019] Using the above preparation method to change the content of Cu element, Cu-Mo / ZSM-5(3) and Cu-Mo / ZSM-5(4) catalyst samples with Cu / Mo=1.5 and Cu / Mo=2 were prepared respectively. Under the same experimental conditions as in Example 1, a catalytic activity similar to it was obtained, NO x The highest conversion rate reached 98.15% and 97.81%, respectively, especially in the middle and low temperature section, and its catalytic activity has also increased.

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Abstract

The invention is load nitrogen oxide clarifying catalyst and the manufacturing method. The character lies in that: it is special for clarifying nitrogen oxide of tail gas of diesel engine and rare combustion gasoline engine which load molybdenum and copper oxide on HZSM-5. the molecular expressing formula is: Cu-Mo / ZSM-5. the invention has following advantages: (1) initiative. (2) high activity. (3) the activity temperature region is wide. (4) high stability. (5) the method is simple and the cost is low.

Description

Technical field: [0001] The present invention supports a catalyst for purifying nitrogen oxides and its preparation, which belongs to the field of heterogeneous catalysis technology and its environmental protection, and specifically relates to a catalyst for controlling air pollution, especially exhaust pollution from diesel vehicles and lean-burn gasoline locomotives, and a preparation method thereof . technical background: [0002] As we all know, motor vehicle exhaust has become the main pollution source of urban road air pollution today, so the research on motor vehicle exhaust pollution control, especially the research on catalytic conversion technology, has become a global research hotspot. At present, the three-way catalyst technology for gasoline vehicle exhaust has tended to be perfected. Of course, with the continuous improvement of motor vehicle exhaust emission standards and the need for commercialization, there are still many issues to be studied. [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01D53/94B01J29/48
Inventor 李哲谢克昌黄伟常丽萍
Owner TAIYUAN UNIV OF TECH
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