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Surface aluminum-rich nay molecular sieve and preparation method thereof

A molecular sieve and aluminum-rich technology, applied in the direction of molecular sieves and alkali exchange compounds, chemical instruments and methods, octahedral crystalline aluminum silicate zeolite, etc., can solve the problems of poor stability of hydrothermal structure, etc. simple and easy effects

Active Publication Date: 2021-02-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Early X-type molecular sieves, as described in USP2882244, are also molecular sieves with a faujasite structure with a very high aluminum content, but because they do not belong to the category of Y-type molecular sieves, and their hydrothermal structural stability is very poor, they cannot Instead of Y molecular sieve and aluminum-rich Y molecular sieve, it is used in the catalytic process

Method used

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  • Surface aluminum-rich nay molecular sieve and preparation method thereof

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Effect test

Embodiment 1

[0048] Add 642.44g of peralkali sodium metaaluminate solution to 866.51g of water glass, age at room temperature 20°C with dynamic stirring for 48 hours, then stand and age at 60°C for 5 hours, and finally add 195g under stirring Deionized water to obtain a molar composition of 15Na 2 O: A1 2 o 3 : 15SiO 2 : 320H 2 O's directing agent.

[0049] Mix 348.4 g of the above-mentioned directing agent and 12.63 g of the first silicon source colloidal silicon dioxide at room temperature and high-speed stirring (900 r / min), and continue stirring for 30 minutes to obtain the first mixture, which is then also stirred at room temperature and high speed Under certain conditions, the first mixture, 508.14g of the second silicon source water glass, 43.10g of the aluminum source low-alkali sodium metaaluminate solution, 286.5g of the aluminum source aluminum sulfate and 166.5g of water are added to the mixing tank in parallel to obtain mole The composition is 2.7Na 2 O: A1 2 o 3 : 8.6...

Embodiment 2

[0051] Mix 642.44g of peralkali sodium metaaluminate solution with 866.51g of water glass, age at room temperature 20°C with dynamic stirring for 48 hours, then stand and age at 60°C for 5 hours, and finally add 195g under stirring Deionized water to obtain a molar composition of 15Na 2 O: A1 2 o 3 : 15SiO 2 : 320H 2 O's directing agent.

[0052] Mix 311.6 g of the above-mentioned directing agent and 12.63 g of the first silicon source colloidal silicon dioxide at room temperature and high-speed stirring (900 r / min), and continue stirring for 60 minutes to obtain the first mixture, which is then also stirred at room temperature and high speed (rotating speed is 1200r / min), the first mixture, 441.37g second silicon source water glass, 40.00g aluminum source low-alkali sodium metaaluminate solution, 251.00g aluminum source aluminum sulfate and 200.63g water are added in parallel In the mixing tank, the molar composition obtained is 2.7Na 2 O: A1 2 o 3 : 8.6SiO2 2 : 269H...

Embodiment 3

[0054] Mix 164.54g of peralkali sodium metaaluminate solution with 291.37g of water glass, age under dynamic stirring at 30°C for 20 hours, then stand and age at 40°C for 15 hours, and finally add 60g of deionized water, to obtain a molar composition of 20Na 2 O: A1 2 o 3 : 20SiO2 2 : 380H 2 O's directing agent.

[0055] Under the conditions of room temperature and high-speed stirring (rotating speed is 900r / min), 515.91g of the above-mentioned directing agent is mixed with 592.62g of the first silicon source water glass in a co-current manner to obtain the first mixture, and then under rapid stirring (rotating speed is 900r / min) / min), at a position far away from the first mixture, add 500g of the second silicon source water glass, 166.31g of aluminum source low-alkali sodium metaaluminate solution, 332.87g of aluminum source aluminum sulfate and 479.4g water, resulting in a molar composition of 4Na 2 O: A1 2 o 3 : 9SiO 2 : 220H 2 O's second mixture. SiO 2 Calcula...

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Abstract

The present disclosure relates to a surface aluminum-rich NaY molecular sieve and a preparation method thereof. The surface SiO of the molecular sieve 2 / Al 2 o 3 The molar ratio is 2.5 to 5, bulk SiO 2 / Al 2 o 3 The molar ratio of the molecular sieve is 6-10, and the Al distribution parameter D of the molecular sieve satisfies: 1.2≤D≤4, wherein, D=Al(S) / Al(C), and Al(S) represents the molecular sieve surface measured by XPS method and the aluminum content in the region of 2-6nm below the surface, Al(C) means the overall aluminum content of the molecular sieve determined by XRF method. The NaY molecular sieve has a larger aluminum distribution gradient than conventional molecular sieves from the particle surface to the center.

Description

technical field [0001] The disclosure relates to a NaY molecular sieve with an aluminum-rich surface and a preparation method thereof. Background technique [0002] At the end of the 1950s, Milton and Breck successfully synthesized Y-type molecular sieves. Due to the structure of NaY molecular sieves, SiO 2 / Al 2 o 3 The ratio is greater than that of X-type molecular sieve, so that its thermal stability and water stability are improved. In the early 1970s, Grace Company developed the directing agent method to synthesize NaY molecular sieves. The raw material was water glass instead of expensive silica sol. The process was simplified and the growth cycle was shortened, so that NaY molecular sieves were rapidly and widely used in petrochemical industries Petroleum cracking catalysis field. So far, among the hundreds of molecular sieves that have been developed, Y molecular sieve is the most widely used in industry. At present, the synthesis of NaY molecular sieves mainly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24
CPCC01B39/205
Inventor 付强李永祥张成喜胡合新慕旭宏舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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