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Copper-containing ammoxidation catalyst and preparation method thereof

A catalyst and ammonia oxidation technology, applied in the field of nitrogen oxides, to achieve the effects of simple process, less leakage and excellent ammonia purification performance

Active Publication Date: 2016-01-06
清华大学苏州汽车研究院(吴江) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] The technical problem to be solved by the present invention is to overcome the NH 3 Oxidation while producing new NOx components, providing a new catalyst system and its method

Method used

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  • Copper-containing ammoxidation catalyst and preparation method thereof
  • Copper-containing ammoxidation catalyst and preparation method thereof
  • Copper-containing ammoxidation catalyst and preparation method thereof

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preparation example Construction

[0043] The synthetic zeolite in the preparation of the ammoxidation catalyst of the present invention must be a solid acid formed by hydrogenation (protonation) by firing treatment after ion-exchanging the alkali metal of the synthetic zeolite structure with ammonia, nitric acid or hydrochloric acid, etc. Zeolites were synthesized by hydrogenation of points (Bronsted acid moieties, and Lewis acid moieties). The calcining temperature is above 350°C, preferably a hydrogenated synthetic zeolite obtained by heating at 500-700°C.

[0044] catalyst metal

[0045] The raw material for carrying copper (II) ions is preferably copper (II) nitrate or hydrochloride, especially nitrate is more ideal.

[0046] metal bearing

[0047] As the metal loading method for synthesizing zeolite, methods such as ion exchange method, impregnation loading method, evaporation drying method, precipitation loading method, physical mixing method, and skeleton replacement method are usually used.

[0048]...

Embodiment 1

[0087] AMMOXIDATION CATALYSTS FOR COPPER(Ⅱ)-SUPPORTED COPPER(Ⅱ)-SUPPORTED CHA HYDROGENED CHA SYNTHESIZED ZEOLITES

[0088] Example 1 A silicoaluminophosphate-based hydrogenated CHA-type synthetic zeolite was loaded with copper (II) ions to obtain an ammoxidation catalyst.

[0089] Adjustment of zeolite raw material

[0090] First, ion-exchanged water and 85 wt% orthophosphoric acid were stirred and mixed in a glass container. Here, pseudo-boehmite (PuralSB) was added and stirred at room temperature for 20 minutes. Next, the morpholine was slowly added with stirring and allowed to reach room temperature for 1 hour. Afterwards, add colloidal silicon dioxide (LudoxAS40), continue to stir for 5 minutes, become the suspension of pH8.1, prepare 1.0 (Al 2 o 3 ): 1.06 (P 2 o 5 ): 1.08 (SiO 2 ): 2.09(R): 66(H 2 O) composition.

[0091] hydrothermal synthesis

[0092]The resulting suspension was transferred to an autoclave (autoclave) with a stirrer, sealed, heated at 170° C. ...

Embodiment 2

[0101] Embodiment 2 except adjusting to 2.3g copper nitrate (II) 3 hydrates (Cu(NO 3 ) 2 ·3H 2 Except for O), the others were the same as in Example 1 to obtain a hydrogenated CHA-type synthetic zeolite supporting copper (II). Its average particle diameter (D50) was 7 μm. According to the analysis result of ICP, the content of copper (II) was 3.8 wt%. In addition, as in Example 1, the slurry was coated on a honeycomb carrier made of cordierite at a load of 270 g / L to obtain the ammoxidation catalyst of Example 2.

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Abstract

The invention relates to the technical field of catalysts, particularly discloses a hydrogenation synthetic zeolite-bearing copper ammoxidation catalyst, and especially relates to the ammoxidation catalyst having ammonia-purification purifying performance in a low temperature region. The ammoxidation catalyst is prepared by mixing a hydrogenation synthetic zeolite crystal having the maximum oxygen ring number of 8 and having a three-dimensional structure with a copper (II) ion containing aqueous solution with the pH value of 0.1-0.7, and filtration and cleaning processes are not required.

Description

technical field [0001] The invention relates to a technique for purifying nitrogen oxides in exhaust gas discharged from lean-burn engines such as diesel engines by using ammonia and a selective reduction catalyst, and relates to an ammonia oxidation catalyst capable of effectively purifying nitrogen oxides while suppressing ammonia leakage. Background technique [0002] Exhaust gas from lean-burn engines such as lean-burn gasoline engines and diesel engines contains various harmful substances according to the structure and type of fuel and combustion air. These harmful substances include hydrocarbons (HC), soluble organic fraction (Soluble Organic Fraction, SOF for short), soot (Soot), carbon monoxide (CO) and nitrogen oxides (NOx), which are regulated by the Air Pollution Prevention and Control Law. limited. Furthermore, among purification methods of these substances, a contact treatment method in which exhaust gas is purified by contacting it with a catalyst is being put...

Claims

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Application Information

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IPC IPC(8): B01J29/85B01J35/04B01D53/94B01D53/58
CPCY02A50/20
Inventor 帅石金北村武昭松冈宽朱君君华伦清水大辅
Owner 清华大学苏州汽车研究院(吴江)
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