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A kind of modification method of molecular sieve

A molecular sieve and modification technology, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve problems such as difficult fine adjustment of pore size, and achieve the effects of smooth pores, increased exchange degree, and increased loading capacity

Active Publication Date: 2016-05-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the molecular dynamics diameter difference that needs to be identified in research and production is far less than 0.1nm, and the pore size of zeolite changes in a jumping manner, with a change range of more than 0.1nm, it is difficult to fine-tune its pore size through the traditional one-time synthesis method Change

Method used

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  • A kind of modification method of molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This example illustrates the modification process of the β molecular sieve provided by the present invention.

[0030] 10g β molecular sieve (provided by Zhoucun Catalyst Factory, SiO 2 / Al 2 o 3 =25,Na 2 O%<0.1%, roasting at 550°C for 2h) Add 10g of diethylamine (Beijing Yili Fine Chemicals Co., Ltd., analytical grade) and 50g of ethanol (Beijing Chemical Plant, analytical grade, the same below), and add it to the pressure melting bomb , heated at 120°C for 24h. Suction filter, wash, and dry the obtained sample at 110°C, add 5 g of the above-mentioned organic base modified sample to 300 g of water, add 40 g of lanthanum nitrate hexahydrate (Sinopharm Chemical Reagent Company, analytical grade, the same below), and exchange at 50°C After 5h, washing and suction filtration, and drying at 110°C, the obtained sample number is A. The results of XRF and BET characterization of sample A are listed in Table 1.

Embodiment 2

[0035] This example illustrates the modification process of the Y-type molecular sieve provided by the present invention.

[0036] 10gY molecular sieve (provided by Changling Catalyst Factory, SiO 2 / Al 2 o 3 =5,Na 2O%<0.1%, roasting at 550°C for 2h) add 10g triethylamine (Beijing Yili Fine Chemicals Co., Ltd., analytical grade) and 50g methanol (Beijing Chemical Plant, analytical grade, the same below), and add them to the pressure melting bomb , heated at 120°C for 144h. Suction filter, wash, and dry the obtained sample at 110°C, add 5 g of the above-mentioned organic base modified sample to 200 g of water, add 30 g of cerium nitrate hexahydrate (Sinopharm Chemical Reagent Company, analytical grade, the same below) and exchange at 60°C After 4 hours, washing and suction filtration, and drying at 110°C, the obtained sample number is B. The results of XRF and BET characterization of sample B are listed in Table 1.

Embodiment 3

[0038] This example illustrates the modification process of the mordenite provided by the present invention.

[0039] 10g mordenite molecular sieve (provided by Zhoucun Catalyst Factory, SiO 2 / Al 2 o 3 =10, Na 2 O%<0.1%, roasting at 550°C for 2h) Add 10g of ethylenediamine (Tianjin Guangfu Technology Development Co., Ltd., analytically pure) and 50g of deionized water, add to the pressure melting bomb, and heat at 150°C for 1h. Suction filter, wash, and dry the obtained sample at 110°C, then add 200 g of water to the above-mentioned organic base modified sample, add 30 g of lanthanum nitrate hexahydrate, exchange at 70°C for 3 hours, wash and suction filter, and dry at 110°C, the obtained sample The number is C. The results of XRF and BET characterization of sample C are listed in Table 1.

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Abstract

The invention provides a modification method of a molecular sieve. The modification method comprises the following steps of mixing a molecular sieve, one or more of water, alcohols and esters, and an organic base to obtain a uniform mixture, treating the mixture in a sealed reactor at a temperature of 100-250 DEG C under self-generated pressure, recovering the treated product and carrying out rare earth ion salt exchange. According to the molecular sieve obtained by the modification method, through removal of silicon in molecular sieve tunnels and skeleton, a rare earth exchange degree and interaction with aluminum atoms in the molecular sieve are improved, unblocking of the molecular sieve tunnels is guaranteed and a rare earth carrying capacity is substantially increased.

Description

technical field [0001] The invention relates to a method for modifying molecular sieves, and more particularly relates to a method for co-modifying molecular sieves with organic bases and rare earths. Background technique [0002] Molecular sieving can be achieved to a certain extent by utilizing the specific pore structure and pore size difference of zeolite. Since the molecular dynamics diameter difference that needs to be identified in research and production practice is far less than 0.1nm, and the pore size of zeolite changes in a jumping manner, with a change range of more than 0.1nm, it is difficult to fine-tune its pore size through traditional one-time synthesis methods Change. On the other hand, in order to improve the adsorption and catalytic selectivity of zeolite molecular sieves, the surface structure and acid properties of zeolite need to be modified. The existing modification methods mainly include: (1) cation exchange of zeolite molecular sieve; (2) hetero...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02
Inventor 付强李永祥胡合新慕旭宏张久顺舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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