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Method for preparing SAPO molecular sieve containing copper and silver bimetal and application thereof

A molecular sieve and bimetallic technology, applied in the field of catalyst synthesis, can solve the problems of low-temperature hydrothermal stability and activity decline, and achieve the effects of reducing production costs, reducing energy consumption, and improving conversion rates

Active Publication Date: 2018-02-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Cu 2+ The introduction of Cu-SAPO-34 can improve its low-temperature stability to a certain extent, but the activity of Cu-SAPO-34, especially in the low-temperature section, still drops significantly after long-term storage.
Therefore, its low-temperature hydrothermal stability needs to be improved.

Method used

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  • Method for preparing SAPO molecular sieve containing copper and silver bimetal and application thereof
  • Method for preparing SAPO molecular sieve containing copper and silver bimetal and application thereof
  • Method for preparing SAPO molecular sieve containing copper and silver bimetal and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0042] Preparation of SAPO-34 molecular sieve raw powder:

[0043] According to the method described in [Document 1], diethylamine was used as an organic template (abbreviated as DEA), and the sample was dried at 120°C to obtain the original SAPO-34 molecular sieve powder.

[0044] 【Document 1】: Microporous and Mesoporous Materials, 2008, 114(1-3), 416-423.

[0045] Preparation of SAPO-18 molecular sieve powder O18-1:

[0046] According to the method described in [Document 2], N,N-diisopropylethylamine was used as an organic template, and the sample was dried at 120°C to obtain the raw SAPO-18 molecular sieve powder.

[0047] 【Document 2】: Journal of Physical Chemistry, 1994, 98(40), 10216-10224.

[0048] Preparation of DNL-6 molecular sieve raw powder:

[0049] According to the method described in [Document 3], diethylamine was used as a template, and the sample was dried at 120°C to obtain the DNL-6 molecular sieve powder.

[0050] 【Document 3】: Microporous and Mes...

Embodiment 1

[0066] The preparation of embodiment 1 Cu-SAPO-34 former powder sample

[0067] With Cu(CH 3 COO) 2 ·H 2 O is the copper source, prepare an aqueous solution with a concentration of 0.01mol / L, put 10g of SAPO-34 molecular sieve raw powder into 220ml of copper ion solution according to the solid-to-liquid ratio of 1:22, stir for 5 minutes, and heat up to 50°C. Exchange 4h. Then it was separated by centrifugation, washed three times with deionized water, and dried at 80° C. to obtain the Cu-SAPO-34 raw powder sample. The mass content of copper oxide in the molecular sieve was determined by XRF to be 1.78 wt%. The XRD results show that the XRD patterns of Cu-SAPO-34 raw powder sample and SAPO-34 molecular sieve raw powder are basically the same, that is, the peak positions are the same, and the peak intensities are slightly different.

Embodiment 2

[0068] The preparation of the former powder sample of embodiment 2 HCu-SAPO-34

[0069] With Cu(CH 3 COO) 2 ·H 2 O is the copper source, prepare an aqueous solution with a concentration of 0.02mol / L, put 10g of SAPO-34 molecular sieve raw powder into 250ml of copper ion solution according to the solid-to-liquid ratio of 1:25, stir for 5 minutes, and then heat up to 50°C. Exchange 4h. Then it was separated by centrifugation, washed three times with deionized water, and dried at 80° C. to obtain the raw powder sample of HCu-SAPO-34. The mass content of copper oxide in the molecular sieve was determined by XRF to be 4.96 wt%. The XRD results show that the XRD spectra of the HCu-SAPO-34 raw powder sample and the SAPO-34 molecular sieve raw powder are basically consistent, that is, the peak positions are the same, and the peak intensities are slightly different.

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Abstract

The invention discloses a method for preparing a SAPO molecular sieve containing copper and silver bimetal. The method is characterized in comprising at least the following steps: (1) after SAPO molecular sieve raw powder is ion-exchanged with a solution containing silver ions to obtain a solid I; (2) after the obtained solid I in step (1) is ion-exchanged a solution containing copper ions, a obtained solid sample is separated and washed, and dried to obtain the SAPO molecular sieve containing the copper and silver bimetal. The method avoids destruction of a molecular sieve structure during preparation of a catalyst by loading metal elements into the SAPO-type molecular sieve through ion exchange. The prepared SAPO molecular sieve containing the copper and silver bimetal has good low-temperature hydrothermal stability and when the prepared SAPO molecular sieve containing the copper and silver bimetal is used as a nitrogen oxide removal reaction catalyst and the total metal loading is relatively large, a high temperature section does not cause strong NH3 oxidation and has good percent conversion over an entire temperature range.

Description

technical field [0001] The application relates to a preparation method of SAPO-type molecular sieves containing copper and silver bimetal and its application in catalysis, belonging to the field of catalyst synthesis. Background technique [0002] SAPO-n (n is the model) series silicoaluminophosphate molecular sieve: its skeleton is made of PO 2 + , AlO 2 - and SiO 2 Composed of tetrahedrons, Si atoms replace P atoms into the framework of neutral aluminum phosphate molecular sieves, causing them to generate negative charges on the framework. According to different synthesis conditions and different Si contents, SAPO molecular sieves exhibit moderate to strong protic acidity. In addition, many SAPO molecular sieves have regular pore structures and good thermal and hydrothermal stability. Such materials have been widely used as Adsorbents, catalysts and catalyst supports. [0003] As one of the main air pollutants, NOx can cause many environmental problems such as acid r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01D53/86B01D53/76B01D53/56
CPCB01D53/76B01D53/8628B01D2251/2062B01D2257/404B01J29/85B01J2229/183
Inventor 向骁田鹏刘中民杨淼刘琳曹磊
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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