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Process of direct copper exchange into na+-form of chabazite molecular sieve, and catalysts, systems and methods

A molecular sieve and catalyst technology, applied in the field of copper-containing molecular sieves, can solve the problems of increasing the capital and operating costs of the preparation method, etc.

Inactive Publication Date: 2013-02-27
BASF CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] There is a continuing need to simplify the process for the preparation of copper-containing molecular sieves having the CHA structure, as the process involves many process steps which increase the capital and operating costs of the process

Method used

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  • Process of direct copper exchange into na+-form of chabazite molecular sieve, and catalysts, systems and methods
  • Process of direct copper exchange into na+-form of chabazite molecular sieve, and catalysts, systems and methods
  • Process of direct copper exchange into na+-form of chabazite molecular sieve, and catalysts, systems and methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0146] h 2 -TPR Spectrum

[0147] h 2 Temperature programmed reduction (TPR) measurements were performed on a Micromeritics Autochem 2910 analyzer with TCD detector. Pretreated at 4% O 2 He was carried out at a rate of 20°C / min from room temperature to 500°C with a residence time of 20 minutes. The samples were then cooled to room temperature. After this, it was purged under helium for 10 min. TPR at 0.5%H 2 / N 2 The process was carried out at a rate of 10°C / min from room temperature to 900°C with a residence time of 20 minutes. A liquid helium cold trap was used during the reduction. UV-VIS

[0148] The samples were ground by hand using a mortar and pestle and then filled into 0.2 cm quartz cuvettes. Diffuse reflectance UV-VIS spectra, expressed as F(R), were collected using diffuse reflectance in a Cary 300UV-VIS spectrometer, where the connection is useful for BaSO 4 Coated integrative spheres. Use the following instrument parameter settings:

[0149] Scan rate...

Embodiment 1

[0165] Embodiment 1—raw material Na-SSZ13

Embodiment 1A

[0166] Embodiment 1A—raw material Na-SSZ13 (1)

[0167] SSZ-13 was crystallized as described in US 4,544,538 using trimethyladamantyl ammonium hydroxide as a template and sodium hydroxide as the other OH source. The pH value was adjusted to 7.5, and the material was recovered by filtration and dried, followed by calcination at 600 °C to prepare Na-form SSZ-13.

[0168] Chemical analysis indicated that the material has 31.8SiO 2 :Al 2 o 3 and 0.62% by weight Na on a non-volatile basis 2 O. XRD indicated that pure SSZ-13 was obtained. The BET surface area of ​​the calcined material determined according to DIN 66131 is 663m 2 / g.

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Abstract

Disclosed are processes for the preparation of copper containing molecular sieves with the CHA structure wherein the copper is exchanged into the Na+-form of the Chabazite, using a liquid copper solution wherein the concentration of copper is in the range of about 0.001 to about 0.4 molar. Also described are copper containing molecular sieves with the CHA structure, catalysts incorporating molecular sieves, systems and methods for their use.

Description

Background technique [0001] Embodiments of the present invention relate to a process for preparing a copper-containing molecular sieve having a silica-to-alumina molar ratio of greater than about 10 and having a CHA structure, wherein the copper exchange into Na + Type chabazite. In addition, the present invention also relates to a copper-containing molecular sieve having a CHA structure obtainable by or through the above-mentioned method, and also relates to a catalyst, a system and a method. [0002] Synthetic and natural zeolites and their use in promoting certain reactions including selective catalytic reduction (SCR) of nitrogen oxides in the presence of oxygen with reducing agents such as ammonia, urea and / or hydrocarbons are well known in the art. Zeolites are aluminosilicate crystalline materials with fairly regular pore sizes, ranging from about 3 to 10 Angstroms in diameter, depending on the type of zeolite and the type and amount of cations contained in the zeolit...

Claims

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Application Information

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IPC IPC(8): B01J29/76B01J37/30B01J37/02B01D53/94F01N3/20B01D53/86C10G11/18
CPCB01J37/30B01J29/763C10G2300/70B01J37/0036B01D2257/406B01D53/9418B01D2257/402B01J37/0246B01D2255/50Y02C20/10C10G11/05B01D53/944B01D2255/20761B01J37/0228B01D53/9436B01J2229/18
Inventor T·比特尔M·迪特勒U·米勒I·布尔A·莫伊尼M·布林B·斯拉夫斯基S·阿莱拉苏W·林X·刘
Owner BASF CORP
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