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Nitrogen oxide storing catalyst with waterlike talc as precursor

A nitrogen oxide and hydrotalcite technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of high cost of precious metals, poor desorption performance, and resistance to Solve problems such as weak performance of sulfur, achieve the effects of reducing production costs, simplifying the synthesis process, and shortening the synthesis cycle

Inactive Publication Date: 2008-03-19
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing NO x Storage catalysts generally have disadvantages such as poor nitrogen storage performance (reserve and life), poor desorption performance, weak sulfur resistance, poor hydrothermal stability, and high cost of precious metals.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Co(NO 3 ) 2 ·6H 2 O, Mg(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O mixed salt solution ([n(Co 2+ )+n(Mg 2+ )]: n(Al 3+ )=3, nCo 2+ =0, 0.5, 1, 1.5, 2, 2.5, 3), the precipitating agent is NaOH and Na 2 CO 3Mixed solution (n(OH -1 ):n(CO 3 2- )=16), the reagents used are analytically pure, the above two solutions are dropped into a beaker filled with distilled water at a certain speed, keep a constant pH ≈ 10 and stir vigorously. After dropping, continue to stir for 1h, wash with deionized water for 7 ~8 times, filter with suction, dry at 60°C, dry at 110°C overnight, and then bake at 800°C for 4 hours to obtain a catalyst, which is recorded as xCoMAO (x=0, 0.5, 1, 1.5, 2, 2.5, 3) for nitrogen oxidation material storage. The reaction intake air composition is 0.13% NO, 0.01% NO 2 , 8%O 2 , N 2 It is balance gas, the intake flow is 500mL / min, and the space velocity is 30000h -1 , and the evaluation temperatures were 100 and 300 °C. Among them, the best r...

Embodiment 2

[0030] Co(NO 3 ) 2 ·6H 2 O, Mg(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O, Fe(NO 3 ) 3 9H 2 O, Mn(NO 3 ) 2 , Zr(NO 3 ) 4 ·5H 2 O and La(NO 3 ) 3 ·6H 2 O mixed salt solution, in which the molar ratio Co:Mg:X:Al=5:1:1:1 (X=Fe, Mn, Zr, La), the precipitating agent is NaOH and Na 2 CO 3 Mixed solution (n(OH -1 ):n(CO 3 2- )=16), all reagents used were of analytical grade. The catalyst was prepared by the same method as in Example 1, which was denoted as CMXAO (X=Fe, Mn, Zr, La), and was used for nitrogen oxide storage. The reaction gas composition is 0.08% NO, 8% O 2 , N 2 It is balance gas, the intake flow is 500mL / min, and the space velocity is 30000h -1 , and the evaluation temperatures were 100 and 300 °C. Among them, the best realization example is: when evaluated at 100°C, the nitrogen oxide storage capacity of the CMLAO catalyst is up to 4.69 mg / g, and the complete storage time of nitrogen oxides is about 270s; when evaluated at 300°C, the nitrogen oxid...

Embodiment 3

[0032] Co(NO 3 ) 2 ·6H 2 O, Mg(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O, and La(NO 3 ) 3 ·6H 2 O mixed salt solution, in which the molar ratio Co:Mg:La:Al=5:1:1:1, the precipitant is NaOH and Na 2 CO 3 Mixed solution (n(OH -1 ):n(CO 3 2- )=16), all reagents used were of analytical grade. The catalyst was prepared by the same method as in Example 1, which was denoted as CMLAO and used for storage of nitrogen oxides. The reaction gas composition is 0.08% NO, 8% O 2 , 8% CO 2 , N 2 It is balance gas, the intake flow is 500mL / min, and the space velocity is 30000h -1 , and the evaluation temperatures were 100 and 300 °C. When evaluated at 100°C, the storage capacity of nitrogen oxides is 1.87mg / g, of which the complete storage time of nitrogen oxides is about 150s; when evaluated at 300°C, the storage capacity of nitrogen oxides is 2.24mg / g, of which the complete storage time of nitrogen oxides About 300s.

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PUM

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Abstract

The invention provides a nitrogen and oxygen storage catalyst with hydrotalcite-like compound as precursor. The formula of the catalyst is CoxM1-xAlyM'1-yOm. The compositions and contents (calculated according to weight percent) of each component are: cobalt oxide (CoO), 0 to 70 percent; and alumina Al2O3, 5 to 20 percent. 0M refers to magnesium oxide (MgO) or Calcium oxide (CaO); M` refers to lanthanum oxide La2O3 or other oxides of transition metal elements, such as copper, strontium, cerium, manganese, iron, zirconium or titanium. The invention adopts coprecipitation method or hydro-thermal method to prepare catalyst, so the cost is low and the preparation process is simple. The catalyst of the invention is used to store nitrogen oxide of lean-burn gasoline engine or diesel engine in oxygen rich atmosphere. The nitrogen dioxide is absorbed on the catalyst in the form of nitrate or nitrite to be stored. The catalyst still has relatively good storage performance of nitrogen dioxide in case of existence of carbon dioxide and water, and has great anti-oxidation performance and wide application prospects.

Description

technical field [0001] The invention relates to a nitrogen oxide storage catalyst with hydrotalcite-like precursor. [0002] The present invention also relates to a method for the preparation of the above-mentioned nitrogen oxide storage catalyst. [0003] The invention also relates to the use of the nitrogen oxide storage catalysts described above. Background technique [0004] Lean-burn gasoline engines and diesel engines with high fuel economy have been widely used. However, the NO in the exhaust of lean-burn gasoline engine and diesel engine x It has become an important source of air pollution. excess NO in the atmosphere x It will cause serious environmental pollution, cause photochemical smog, lead to the formation of acid rain, and cause great harm to human body and other organisms. Therefore, research on reducing pollutant emissions from motor vehicles, especially NO in exhaust x Research on control technology has become a research hotspot in the field of envir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/835B01J23/78B01D53/94
CPCY02A50/20
Inventor 郝郑平於俊杰陶炎鑫刘长春李兰冬
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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