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A kind of scr catalyst and preparation method

A technology of SCR catalyst and preparation steps, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of catalyst performance degradation, SCR catalyst poisoning, etc., and achieve improved dispersibility, low time, and process cost. low effect

Active Publication Date: 2020-10-09
SINOCAT ENVIRONMENTAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above studies basically use rare earth or transition metal elements as additives, but no one uses alkali metals or alkaline earth metals. This is because although alkali metals or alkaline earth metals are also chemically very active metal elements, they are very active. It is easy to cause poisoning to the SCR catalyst, which makes the performance of the catalyst drop sharply

Method used

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  • A kind of scr catalyst and preparation method
  • A kind of scr catalyst and preparation method

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preparation example Construction

[0028] (1) Preparation of modified molecular sieve carrier material: dissolve soluble alkali metal or alkaline earth metal salt in excess distilled water, heat and stir until dissolved evenly, the total concentration of metal salt ions in the solution is 0.01-0.5mol / L, and the temperature is 50 -90°C; under strong stirring, add molecular sieves to the above solution for ion exchange, the exchange temperature is 50-90°C, the exchange time is 2-12h, then filter, wash and dry;

[0029] (2) carrier material into powder: the modified molecular sieve material prepared above is crushed and ground into a powder with a particle size in the range of D50=500-3000nm;

[0030] (3) One-step pulping: dissolve the carrier powder in step (2) in a certain amount of distilled water, and heat it to 50-90°C under stirring to make a slurry; add soluble copper salt and exchange 2 under stirring -12h; after cooling down to room temperature, add soluble iron salt and stir to dissolve for 0.5-5h; then ...

Embodiment 1

[0042] (1) Preparation of molecular sieve carrier material: prepare 1.5L potassium nitrate solution with a concentration of 0.05mol / L, heat to a constant temperature of 70°C, and add 150g dry weight ZSM-5 (MFI) molecular sieve into a constant temperature reaction kettle while stirring And carry out ion exchange modification, the exchange time is 4h; The obtained slurry is filtered and washed, and the obtained molecular sieve mud is dried, crushed and ground into a particle size of D 50 = Powder in the range of 2000-2500nm;

[0043] (2) Slurry: Add the above powder into 225g of distilled water, heat up and stir to form a slurry, then add 16.99g of copper nitrate trihydrate, and stir at constant temperature for 4 hours. After cooling down to room temperature, add 43.29g ferric nitrate nonahydrate, stir for 1h; add 12g ethylenediamine, 0.48g monohydrate pseudoboehmite and 24g PVG solution (20%), the pH range is 7.0-7.5; add 32g silica sol (25 %), stirred for 1h, and ball milled ...

Embodiment 2

[0052] According to the steps of Example 1, a Cu:Fe=4:3 copper-iron composite SCR catalyst was prepared, and the import agent was 12g ethylenediamine, 0.32g hydroxymethylcellulose;

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Abstract

The invention discloses an SCR catalyst and a preparation method thereof. Including: preparation of modified molecular sieve materials, powdering of materials, one-step pulping, coating and roasting; one-step pulping adopts dissolving powder materials in distilled water and stirring to make slurry, adding soluble copper salt for ion exchange for 2-12h, and then Cool down to room temperature, add soluble iron salt, stir and exchange for 0.5-5h, then add importing agent and binder, stir, and ball mill to prepare. The present invention uses cheap medium / large pore molecular sieves as the carrier, uses alkali metals or alkaline earth metals to modify the carrier, prepares molecular sieve carrier materials containing alkali metals or metal ions, and then uses one-step pulping to load the active component copper and iron to prepare a monolithic SCR catalyst; the method is simple to operate, low in process and time costs, and the prepared catalyst has good hydrothermal stability while having an excellent reaction temperature window.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to an SCR catalyst and a preparation method. Background technique [0002] Nitrogen oxides (NOx) in the atmosphere mainly come from the combustion of fossil fuels and are one of the most important air pollutants, seriously endangering human health and the ecological environment. At present, selective catalytic reduction of ammonia (NH 3 -SCR) method is the most mature technology and the most mainstream application of NOx removal technology. The principle is to use NH 3 (or urea) as a reducing agent to selectively reduce toxic NOx to nontoxic N 2 and H 2 O. In recent years, it has been found that molecular sieve-based catalysts with non-toxic metal elements Cu and Fe as active components can exhibit excellent performance in SCR reactions. Especially in the last ten years, SCR catalysts supported by small-pore molecular sieves have shown considerable adv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/46B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J29/46B01J2229/18
Inventor 冯锡吴干学张艳华杜洪忠刘志敏陈耀强王云李云陈启章
Owner SINOCAT ENVIRONMENTAL TECH