Preparation method of modified Beta molecular sieve catalyst

A molecular sieve and catalyst technology, which is used in the preparation of modified Beta molecular sieve catalysts, can solve problems such as side reactions and reduce catalytic activity, and achieve the effects of high surface energy, improved catalytic reaction activity, and good anti-poisoning ability.

Active Publication Date: 2018-01-12
上海歌通实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The NO of molecular sieve catalyst with excellent performance x The conversion rate can basically reach more than 90%. However, under actual working conditions, there is a certain amount of SO in the exhaust gas of motor vehicles. 2 , hydrocarbons, CO 2 and H 2 O, etc., especially hydrocarbons will compete for adsorption on the molecular sieve channels, and cause side reactions and carbon deposition on the catalyst, thereby reducing the catalytic activity. x - Catalysts with SCR and hydrocarbon SCR reactivity have great practical significance

Method used

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  • Preparation method of modified Beta molecular sieve catalyst
  • Preparation method of modified Beta molecular sieve catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of a modified Beta molecular sieve catalyst, comprising the following steps:

[0027] (1) Preparation of Beta molecular sieve raw powder: first, 2.05g of aluminum source NaAlO 2 , 29.45g template agent tetraethylammonium hydroxide, 8g sodium hydroxide and 216g deionized water were mixed and stirred evenly, then 60.08g silicon source silica sol was added to the above mixed solution to form a homogeneous sol system, and the sol system was heated at 60°C After aging for 2 hours, put it into a high-pressure reactor, raise the temperature to 160°C for crystallization for 36 hours; after hydrothermal crystallization, filter, wash, and dry to obtain the original powder of Beta molecular sieve. The relative crystallinity of the Beta molecular sieve raw powder is not less than 80%, and the specific surface area is 500-580m 2 / g, the pore volume is 0.25~0.50cm 3 / g, mesopore diameter 4~15nm;

[0028] (2) Preparation of Mn-Co-Beta molecular sieve:

[0029]...

Embodiment 2

[0034] A preparation method of a modified Beta molecular sieve catalyst, comprising the following steps:

[0035] (1) Preparation of Beta molecular sieve raw powder: first, 2.97g of aluminum source NaAlO 2 , 51.54g template agent tetraethylammonium hydroxide, 12g sodium hydroxide and 378g deionized water were mixed and stirred evenly, then 60.08g silicon source silica sol was added to the above mixed solution to form a uniform sol system, and the sol system was heated at 70°C Aging for 1.5 hours, then loaded into a high-pressure reactor, heated to 150°C for crystallization for 60 hours; after hydrothermal crystallization, filtered, washed, and dried to obtain the original Beta molecular sieve powder. The relative crystallinity of the Beta molecular sieve is not less than 80%, and the specific surface area is 500-580m 2 / g, the pore volume is 0.25~0.50cm 3 / g, mesopore diameter 4~15nm;

[0036] (2) Preparation of Mn-Co-Beta molecular sieve:

[0037] Ammonium sulfate with a ...

Embodiment 3

[0042] A preparation method of a modified Beta molecular sieve catalyst, comprising the following steps:

[0043] (1) Preparation of Beta molecular sieve raw powder: first, 3.28g of aluminum source NaAlO 2 , 73.63g template agent tetraethylammonium hydroxide, 16g sodium hydroxide and 540g deionized water were mixed and stirred evenly, then 60.08g silicon source silica sol was added to the above mixed solution to form a uniform sol system, and the sol system was heated at 80°C Aging for 2 hours, then loaded into a high-pressure reactor, heated to 160°C for crystallization for 36 hours; after hydrothermal crystallization, filtered, washed, and dried to obtain the original Beta molecular sieve powder. The relative crystallinity of the Beta molecular sieve raw powder is not less than 80%, and the specific surface area is 500-580m 2 / g, the pore volume is 0.25~0.50cm 3 / g, mesopore diameter 4~15nm;

[0044] (2) Preparation of Mn-Co-Beta molecular sieve:

[0045] Ammonium nitrat...

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Abstract

The invention provides a preparation method of a modified Beta molecular sieve catalyst, belonging to the technical field of catalysts. The preparation method comprises the steps of preparing Beta molecular sieve raw powder, preparing a Mn-Co-Beta molecular sieve, and preparing a Sn modified Mn-Co-Beta molecular sieve, wherein the mole ratio of Mn to Co is (5-8) to 1, Mn accounts for 10%-13% of the mass of the Mn-Co-Beta molecular sieve, and the mole ratio of Sn to manganese is 1 to (35-40). The catalyst prepared by virtue of the preparation method can be applied to an automobile tail gas low-temperature SCR denitration system and has relatively good CO2 and SO2 poisoning resistance in the premise that a relatively good temperature operation window is maintained, so that the relatively good catalytic activity is guaranteed.

Description

【Technical field】 [0001] The invention relates to the technical field of catalysts, in particular to a preparation method of a modified Beta molecular sieve catalyst. 【Background technique】 [0002] Nitrogen oxides are a common air pollutant, mainly from the combustion of fossil fuels. They are not only the main cause of acid rain, but also can react with hydrocarbons to form photochemical smog. Now they have become second only to inhalable particulate matter and sulfur dioxide. important air pollutants. NO emissions from stationary sources represented by coal-fired power plant flue gas and mobile sources represented by diesel vehicle exhaust x accounts for about 60% of emissions. At present, ammonia-selective catalytic reduction (Ammonia-Selective Catalytic Reduction of NO x , NH3-SCR) is the removal of fixed source NO x One of the most effective and widely used technical methods, the core of which is the catalyst, currently the most widely used commercially is V 2 o ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/78B01D53/86B01D53/56C01B39/04
Inventor 黄旭
Owner 上海歌通实业有限公司
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