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Modified Y molecular sieve with its surface rich in mesopores, and preparation method thereof

A molecular sieve and modification 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 difficult regulation, collapse of molecular sieve framework structure, and difficulty in the same degree of catalyst surface dealumination And other issues

Active Publication Date: 2019-12-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dealumination process of molecular sieves is a complex and difficult to control process. The removal of aluminum is very sensitive to dealumination conditions, and it is difficult to achieve the same degree of dealumination on the surface of the catalyst as in the bulk phase. Usually, the aluminum on the surface of molecular sieves is easier to remove, while To remove the aluminum in the bulk phase of the molecular sieve, more severe dealumination conditions are required, which will cause the collapse of the molecular sieve skeleton structure and the destruction of the micropores. The structure and acid properties have a great influence

Method used

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  • Modified Y molecular sieve with its surface rich in mesopores, and preparation method thereof
  • Modified Y molecular sieve with its surface rich in mesopores, and preparation method thereof
  • Modified Y molecular sieve with its surface rich in mesopores, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] 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.

[0061] 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

[0063] 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.

[0064] 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

[0066] 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.

[0067] 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 invention relates to a modified Y molecular sieve with its surface rich in mesopores, and a preparation method thereof. A molar ratio of the bulk phase SiO2 / Al2O3 of the modified Y molecular sieveis 10.0 to 13.0; the modified Y molecular sieve has a BET-process total pore volume of no less than 0.38 cm <3> / g and a BET-process secondary pore volume of no less than 0.06 cm <3> / g; the cell parameters a, b and c are equal and are in a range of 2.44-2.46 nm; and the content of sodium oxide in the modified Y molecular sieve is not more than 0.1 wt% based on the total weight of the modified Y molecular sieve. Compared with conventional Y molecular sieves, the modified Y molecular sieve of the invention has a larger surface mesoporous volume.

Description

technical field [0001] The disclosure relates to a modified Y molecular sieve whose surface is rich in mesopores 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 si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24C01B39/02
CPCC01B39/026C01B39/24C01P2002/01C01P2004/04C01P2006/14
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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