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Mn-modified Cu-SSZ-13 catalyst as well as preparation method and application thereof

A cu-ssz-13, catalyst technology, applied in the direction of catalyst activation/preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of insufficient mechanical strength, difficult catalyst molding, etc., to achieve improved dispersion, easy operation, and optimization distribution effect

Pending Publication Date: 2021-01-22
NINGBO URBAN ENVIRONMENT OBSERVATION & RES STATION NUEORS CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst prepared by the invention has a large surface area and strong adsorption capacity for gaseous substances, but its disadvantage is that the mechanical strength is insufficient, and the catalyst is not easy to shape

Method used

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  • Mn-modified Cu-SSZ-13 catalyst as well as preparation method and application thereof
  • Mn-modified Cu-SSZ-13 catalyst as well as preparation method and application thereof
  • Mn-modified Cu-SSZ-13 catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This embodiment provides a kind of Mn modified Cu-SSZ-13 catalyst and its preparation method, and the preparation method comprises the following steps:

[0054] (1) Using H + Concentration is the nitric acid solution pickling Cu-SSZ-13 catalyst of 0.25mol / L, obtains pretreatment Cu-SSZ-13 catalyst after suction filtration, washing, drying, roasting; The liquid-solid ratio of described pickling is 50mL / g , the temperature is 70°C, and the time is 12h; the washing liquid used in the washing is deionized water; the temperature of the drying is 80°C, and the time is 12h; the roasting is carried out under an air atmosphere, and the temperature is 600°C, The heating rate was 8°C / min, and the time was 6h; the Cu-SSZ-13 catalyst was a molecular sieve prepared by the preparation method disclosed in Example 1 of CN 101973562A, and was calcined in a muffle furnace at 600°C for 6h.

[0055] (2) Utilize the manganese acetate solution to vacuum impregnate the Cu-SSZ-13 catalyst obta...

Embodiment 2

[0058] This embodiment provides a kind of Mn modified Cu-SSZ-13 catalyst and its preparation method, and the preparation method comprises the following steps:

[0059] (1) Using H + Concentration is the sulfuric acid solution acid leaching Cu-SSZ-13 catalyst of 0.15mol / L, obtains pretreatment Cu-SSZ-13 catalyst after filtering, washing, drying, roasting; The liquid-solid ratio of described acid leaching is 30mL / g, The temperature is 60°C, and the time is 14h; the washing liquid used in the washing is absolute ethanol; the temperature of the drying is 70°C, and the time is 14h; the roasting is carried out under the air atmosphere, the temperature is 550°C, The rate is 6°C / min, and the time is 7h; the Cu-SSZ-13 catalyst is a molecular sieve prepared by the preparation method disclosed in Example 1 of CN 101973562A, and is calcined in a muffle furnace at 600°C for 6h.

[0060] (2) Utilize the manganese nitrate solution to vacuum impregnate the Cu-SSZ-13 catalyst obtained in step...

Embodiment 3

[0063] This embodiment provides a kind of Mn modified Cu-SSZ-13 catalyst and its preparation method, and the preparation method comprises the following steps:

[0064] (1) Using H +Concentration is the hydrochloric acid solution acid leaching Cu-SSZ-13 catalyst of 0.38mol / L, obtains pretreatment Cu-SSZ-13 catalyst after centrifugation, washing, drying, roasting; The liquid-solid ratio of described acid leaching is 75mL / g, The temperature is 80°C, and the time is 10h; the washing liquid used in the washing is deionized water; the temperature of the drying is 90°C, and the time is 10h; The rate was 12°C / min, and the time was 5h; the Cu-SSZ-13 catalyst was a molecular sieve prepared by the preparation method disclosed in Example 1 of CN 101973562A, and was calcined in a muffle furnace at 600°C for 6h.

[0065] (2) Utilize the manganese chloride solution to vacuum impregnate the Cu-SSZ-13 catalyst obtained in step (1) in a rotary evaporator until the catalyst is completely dry, d...

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Abstract

The invention provides a Mn-modified Cu-SSZ-13 catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps of (1) carrying out acid leachingon the Cu-SSZ-13 catalyst, and carrying out solid-liquid separation to obtain a pretreated Cu-SSZ-13 catalyst, and (2) carrying out vacuum impregnation on the pretreated Cu-SSZ-13 catalyst obtained inthe step (1) by using a manganese salt solution, and drying to obtain the Mn-modified Cu-SSZ-13 catalyst. The Mn-modified Cu-SSZ-13 catalyst provided by the invention can be used for a low-temperature section SCR reaction, has a relatively large specific surface area and relatively high gas adsorption capacity, realizes high activity and high selectivity of the catalyst in a relatively low temperature interval, and keeps the catalytic activity of a medium-temperature section from being greatly influenced.

Description

technical field [0001] The invention belongs to the technical field of environmental catalysis and relates to a Cu-SSZ-13 catalyst, in particular to a Mn-modified Cu-SSZ-13 catalyst and its preparation method and application. Background technique [0002] Nitrogen oxides (NO x ), as a common air pollutant, is one of the main substances that form environmental problems such as acid rain, smog, and photochemical smog. NO x There are a wide range of sources, including natural sources and man-made sources. Man-made sources are divided into mobile sources and stationary sources. Mobile sources are mainly diesel vehicle exhaust emissions, and stationary sources include waste incineration plants, coal-fired power plants, and various industrial exhaust gases. Selective catalytic reduction of ammonia (NH 3 -SCR) is the current control NO x One of the most effective means, the principle of which is NH 3 As a reducing agent, under proper temperature and catalyst action, NO x conv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/78B01J35/10B01J37/02B01J37/06B01J37/08B01D53/86B01D53/56
CPCB01J29/783B01J37/0201B01J37/06B01J37/088B01D53/8628B01J2229/186B01J35/617B01J35/633B01J35/647
Inventor 贺泓王婧怡张燕单文坡杜金鹏单玉龙
Owner NINGBO URBAN ENVIRONMENT OBSERVATION & RES STATION NUEORS CHINESE ACADEMY OF SCI
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