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Molecular sieve loaded modified manganese-based catalyst used for diesel car tail gas denitration, and preparation method and applications thereof

A manganese-based catalyst, molecular sieve technology, applied in molecular sieve catalysts, separation methods, chemical instruments and methods, etc., can solve problems such as selectivity and poor sulfur resistance and water resistance, and achieve a wide active temperature window, high low temperature activity, and wide application. Foreground effect

Inactive Publication Date: 2019-07-02
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the pure manganese oxide catalyst has high catalytic activity at low temperature, its N 2 Poor selectivity and sulfur and water resistance, so it needs to be modified

Method used

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  • Molecular sieve loaded modified manganese-based catalyst used for diesel car tail gas denitration, and preparation method and applications thereof
  • Molecular sieve loaded modified manganese-based catalyst used for diesel car tail gas denitration, and preparation method and applications thereof
  • Molecular sieve loaded modified manganese-based catalyst used for diesel car tail gas denitration, and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] a. Calcining the HZSM-5 molecular sieve carrier at 550°C for 3-5 hours, then cooling it for later use;

[0046] B. take by weighing 12g manganese acetate and 7.8g cerium nitrate, both are dissolved in 258mL deionized water, fully stir and mix, obtain mixed salt solution;

[0047] c. Weigh 51.5g of HZSM-5 molecular sieve carrier in proportion, use equal volume impregnation method, add it to the mixed salt solution described in step b and stir for 0.5 hours at the same time, sonicate for 2 hours, and stand at room temperature for 32 hours Obtain catalyst precursor;

[0048] d. Place the catalyst precursor in an oven, dry it at a constant temperature at 100-110°C for 18 hours, and then roast it in an air atmosphere at 400°C for 3 hours, and grind and sieve the obtained catalyst to 40-60 mesh;

[0049] e. The catalyst of the present invention carries out XRD, SEM characterization and nitrogen adsorption-desorption experiment respectively, and XRD diffraction pattern is as ...

Embodiment 2

[0052] a. Calcining the HZSM-5 molecular sieve carrier at 550°C for 3-5 hours, then cooling it for later use;

[0053] B. take by weighing 5.5g manganese acetate and 4.5g cerium nitrate, both are dissolved in 118mL deionized water, fully stir and mix, obtain mixed salt solution;

[0054] c. Weigh 23.6g of HZSM-5 molecular sieve carrier in proportion, and use equal volume impregnation method, add it to the mixed salt solution described in step b and stir for 0.5 hours at the same time, sonicate for 3 hours, and stand at room temperature for 24 hours Obtain catalyst precursor;

[0055] d. Place the catalyst precursor in an oven, dry it at a constant temperature at 100-110°C for 18 hours, and then roast it in an air atmosphere at 400°C for 3 hours, and grind and sieve the obtained catalyst to 40-60 mesh;

[0056] e. The catalyst of the present invention was characterized and nitrogen adsorption and desorption experiments were carried out. The results of the nitrogen adsorption a...

Embodiment 3

[0059] a. Calcining the HZSM-5 molecular sieve carrier at 550°C for 3-5 hours, then cooling it for later use;

[0060] b. Weigh 18.5g manganese acetate and 10.5g cerium nitrate, dissolve the two in 397mL deionized water, fully stir and mix to obtain a mixed salt solution;

[0061] c. Weigh 79.5g of HZSM-5 molecular sieve carrier in proportion, use equal volume impregnation method, add it to the mixed salt solution described in step b and stir for 0.5 hours at the same time, sonicate for 3 hours, and stand at room temperature for 32 hours Obtain catalyst precursor;

[0062] d. Place the catalyst precursor in an oven, dry it at a constant temperature at 100-110°C for 18 hours, and then roast it in an air atmosphere at 400°C for 3 hours, and grind and sieve the obtained catalyst to 40-60 mesh;

[0063] e. The catalyst of the present invention is characterized and subjected to nitrogen adsorption and desorption experiments. The results of the nitrogen adsorption and desorption ex...

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Abstract

The invention relates to a molecular sieve loaded modified manganese-based catalyst used for diesel car tail gas denitration, and a preparation method and applications thereof. According to the catalyst, HZSM-5 molecular sieve is taken as a carrier, manganese oxides (MnO<x>) is taken as a main active component, cerium dioxide (CeO2) is taken as an auxiliary agent, equivalent-volume impregnation method is adopted to prepare a finished product; the mass ratio of the carrier, the active component, and the auxiliary agent is controlled to be 100: (10-16.5) : (1.5-7.5); the catalytic efficiency ofthe molecular sieve loaded modified manganese-based catalyst in catalytic purifying of nitrogen oxides (NO<x>) at 120 to 250 DEG C is higher than 85%; the active temperature window is wide; high activity and high selectivity at a low temperature zone are achieved; sulfur resistance and water resistance are excellent; the molecular sieve loaded modified manganese-based catalyst is friendly to the environment; cost is low; operation is convenient; and the molecular sieve loaded modified manganese-based catalyst can be widely used for diesel car tail gas denitration.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a low-temperature denitrification catalyst capable of efficiently treating nitrogen oxides in diesel vehicle exhaust, in particular to a molecular sieve-loaded modified manganese-based catalyst for denitrification of diesel vehicle exhaust, its preparation method and application. Background technique [0002] In recent years, my country's industrial development has advanced by leaps and bounds. While bringing economic benefits, the exposed environmental problems have become increasingly serious, especially motor vehicle pollution has become the main source of pollution in many cities. Among them, heavy-duty diesel trucks are the main means of transportation, and their pollutant emissions remain high, especially nitrogen oxides (NO x ) photochemical reaction occurs under the action of ultraviolet light to generate secondary aerosol, which is seriously harmful to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48B01D53/94B01D53/56
CPCB01D53/9418B01D2258/012B01J29/48Y02T10/12Y02A50/20
Inventor 任爱玲张东隅
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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