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Molecular sieve containing rare earth elements and production method thereof

A rare earth element and production method technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of weak catalytic ability of molecular sieves, achieve excellent hydrothermal aging resistance, large specific surface area, good The effect of catalytic activity

Active Publication Date: 2020-10-13
BAOTOU RES INST OF RARE EARTHS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It uses a one-step hydrothermal method to synthesize molecular sieves. The microscopic shape of the molecular sieves is non-spherical, and the catalytic ability of molecular sieves at high and low temperatures is relatively weak.

Method used

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  • Molecular sieve containing rare earth elements and production method thereof
  • Molecular sieve containing rare earth elements and production method thereof
  • Molecular sieve containing rare earth elements and production method thereof

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preparation example Construction

[0047] The preparation method of the molecular sieve containing rare earth elements of the present invention comprises the following steps: (1) a hydrothermal reaction step; (2) a roasting step. The composition and properties of the obtained rare earth element-containing molecular sieve are as described above. Detailed description will be given below.

[0048] The steps of the hydrothermal reaction

[0049] The molecular sieve framework mixture including silicon source, aluminum source, template agent, organic base and water is subjected to the first hydrothermal reaction to obtain the first reaction product; after the first reaction product, ammonium source and copper source are mixed, the second hydrothermal reaction is carried out thermal reaction to obtain a second reaction product; after mixing the second reaction product with a rare earth source, perform a third hydrothermal reaction to obtain a third reaction product.

[0050] The aluminum source of the present inve...

Embodiment 1

[0076] 28.4g of 25wt% aqueous solution of N,N,N-trimethyladamantane ammonium, 3.1g of sodium ethoxide and 85g of water were heated to reflux at a temperature of 40°C and stirred evenly to form a mixture A; A, 1.17g sodium metaaluminate and 32.9g silica sol (solid content is 20wt%, pH is 3.2, and density is 1.2g / cm 3 , with a particle size of 11 nm) was stirred and mixed for 2 hours to form a molecular sieve framework mixture; the molecular sieve framework mixture was subjected to a first hydrothermal reaction at 110° C. for 2 days to obtain a first reaction product.

[0077] Lower the temperature of the first reaction product to 25°C; stir and mix the cooled first reaction product with 3.43g of ammonium nitrate for 8 hours, then stir and mix with 8.9g of chelated copper glutamic acid for 3 hours, then carry out the second reaction at 80°C. Two hydrothermal reaction 10h, to obtain the second reaction product.

[0078] After stirring and reacting the second reaction product with ...

Embodiment 2

[0081] 34.4g concentration is 25wt% the aqueous solution of N,N,N-trimethyladamantane ammonium, 5.25g concentration is 20wt% tetraethylammonium hydroxide and 85g water under heating reflux, temperature is under the condition of 30 ℃ Stir evenly to form mixture A; Mix mixture A, 7.28g aluminum sol (solid content is 10wt%, pH is 4, viscosity is 43mPa·s, particle diameter is 10nm) and 28.5g silica sol (solid content is 20wt%, pH 5.6, the density is 1.5g / cm 3 , with a particle size of 11nm) was stirred and mixed for 3 hours to form a molecular sieve framework mixture; the molecular sieve framework mixture was subjected to a first hydrothermal reaction at 130° C. for 3 days to obtain a first reaction product.

[0082] Lower the temperature of the first reaction product to 25°C; stir and mix the cooled first reaction product with 4.57g of ammonium nitrate for 8 hours, then stir and mix with 8.6g of copper acetate for 3 hours, then carry out the second hydrothermal reaction at 70°C ...

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Abstract

The invention discloses a molecular sieve containing rare earth elements and a production method thereof. A framework of the molecular sieve containing rare earth elements comprises an aluminum element and a silicon element, active components of the molecular sieve comprise a rare earth element(s) and a copper element, and the microstructure of the molecular sieve is flower-ball-shaped, wherein the rare earth element(s) are selected from one or more of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, scandium and yttrium. The molecular sieve has a large specific surface area.

Description

technical field [0001] The invention relates to a molecular sieve containing rare earth elements and a production method thereof, in particular to a CHA type molecular sieve containing rare earth elements and a production method thereof. Background technique [0002] Molecular sieve is a kind of adsorbent or thin film material with uniform micropores, mainly composed of silicon, aluminum, oxygen and some other metal cations. Zeolite molecular sieve is an inorganic crystal material, which is widely used in the fields of catalysis, adsorption and ion exchange because of its regular pore structure, strong acidity and high hydrothermal stability, and plays an irreplaceable role. [0003] CN110193379A discloses a preparation method of CuRE / SAPO-34 molecular sieve. Mix phosphoric acid with deionized water, add pseudo-boehmite, stir and mix, add a salt containing rare earth element RE, stir and mix, add silica sol, and then add template agent drop by drop to obtain a gel product; ...

Claims

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Application Information

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IPC IPC(8): C01B39/04B01J29/76B01J35/08B01J35/10B01J37/10
CPCC01B39/04B01J29/763B01J23/002B01J37/10C01P2006/12C01P2006/16C01P2006/14C01P2004/03C01P2002/72C01P2004/30B01J35/51B01J35/617B01J35/643B01J35/635
Inventor 李兆强王艳丁智勇樊蓉蓉张丞王雨郭欣康娜刘威王荣宋静
Owner BAOTOU RES INST OF RARE EARTHS
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