Cu-SSZ-13 catalyst, and preparation method and application thereof

A cu-ssz-13, catalyst technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of limited use, large impact on the ecological environment, etc., and achieve wide temperature window, water Good thermal stability, the effect of improving hydrothermal stability

Active Publication Date: 2013-06-19
江西中科鸿虔新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of ammonium nitrate in my country is currently limited, and it has a greater impact on the ecological environment, and the activity of the obtained catalyst needs to be further improved.

Method used

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  • Cu-SSZ-13 catalyst, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Prepare a nitric acid solution with pH = 1, add Cu-SSZ-13 molecular sieve prepared by in situ synthesis to the solution, and stir in a water bath at 80°C for 12 hours, then perform suction filtration and wash three times to obtain a filter cake, and filter The cake was dried in an oven at 110°C for 6 hours, and finally baked in air at 600°C in a muffle furnace for 6 hours to obtain a powdered Cu-SSZ-13 catalyst. The prepared catalyst is pressed into tablets, ground, sieved, and 20-40 meshes are taken for later use.

Embodiment 2

[0044] Prepare a hydrochloric acid solution with a pH value of 0, add Cu-SSZ-13 molecular sieve prepared by in situ synthesis to the solution, and stir in a water bath at 25°C for 24 hours, then perform suction filtration and wash 3 times to obtain a filter cake, and The filter cake was dried in an oven at 110°C for 6h, and finally calcined in air at 550°C for 14h in a muffle furnace to obtain a powdered Cu-SSZ-13 catalyst. The prepared catalyst is pressed into tablets, ground, sieved, and 20-40 meshes are taken for later use.

Embodiment 3

[0046] Prepare a sulfuric acid solution with a pH value of 4, add Cu-SSZ-13 molecular sieve prepared by in situ synthesis to the solution, and stir in a water bath at 90°C for 5 hours, then perform suction filtration and wash 3 times to obtain a filter cake, and The filter cake was dried in an oven at 110°C for 6h, and finally calcined in air at 800°C for 3h in a muffle furnace to obtain a powdered Cu-SSZ-13 catalyst. The prepared catalyst is pressed into tablets, ground, sieved, and 20-40 meshes are taken for later use.

[0047] The amount of catalyst used is 50 mg respectively, and the composition of the reaction mixture is: [NO]=[NH 3 ]=500ppm, [O 2 ]=5%, N 2 As balance gas, the total gas flow rate is 500mL / min, and the corresponding space velocity is 400,000h -1 , The reaction temperature is 150-550°C. NO and NH 3 and by-product N 2 O, NO 2 All were measured using an infrared gas cell. The number of the Cu-SSZ-13 catalyst obtained by using the acidic solution water...

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Abstract

The invention discloses a method for preparing a Cu-SSZ-13 catalyst through an in-situ synthesis method. A Cu-SSZ-13 molecular sieve sample is prepared by taking acid as an exchange reagent and treating through an in-situ synthesis method. Compared with the currently used ammonium nitrate ion exchange method, the after treatment method for the Cu-SSZ-13 molecular sieve prepared through an in-situ synthesis method is more environment-friendly and effective; the activity of the prepared catalyst is higher; and the hydrothermal stability is better. According to the method, the silica-alumina ratio of the molecular sieve structure is increased while the catalyst having high catalytic activity is obtained; and the obtained Cu-SSZ-13 catalyst has excellent hydrothermal stability, wide temperature window and excellent N2 selectivity, and is very applicable to purification of tail gas from diesel cars.

Description

technical field [0001] The invention relates to a method for preparing a Cu-SSZ-13 catalyst by an in-situ synthesis method, a catalyst prepared by the method and the use of the catalyst. The Cu-SSZ-13 catalyst is used for the removal of nitrogen oxides in diesel vehicle exhaust Selective catalytic reduction (NH 3 -SCR) process. Background technique [0002] Nitrogen oxides (NO x ) mainly comes from the combustion of fossil fuels. It is not only the main cause of acid rain, but also can react with hydrocarbons to form photochemical smog. At present, it has become an important air pollutant after inhalable particulate matter and sulfur dioxide. 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. Mobile source NO x Emission control methods can be divided into in-machine purification technology and post-treatment technology. The selective catalyti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01D53/94B01D53/56
Inventor 贺泓谢利娟刘福东石晓燕肖丰收任利敏
Owner 江西中科鸿虔新材料有限公司
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