Modified aluminium phosphate molecular sieve and preparation method thereof

An aluminum phosphate molecular sieve and molecular sieve technology, applied in the field of molecular sieves, can solve the problems of ZSM-5 molecular sieves such as unsatisfactory hydrothermal stability, adsorption performance and cracking performance, and achieve excellent adsorption performance and cracking performance, small particle size and complete crystallization Effect

Active Publication Date: 2014-05-28
鹤壁博文科峰催化技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modified ZSM-5 molecular sieve obtained by this method is still not ideal in terms of hydrothermal stability, adsorption performance and cracking performance.

Method used

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  • Modified aluminium phosphate molecular sieve and preparation method thereof
  • Modified aluminium phosphate molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In parts by weight, add 1 part of ZSM-5 molecular sieve to 4 parts of purified water, add 0.50 parts of diammonium hydrogen phosphate and 0.008 parts of zinc nitrate solution in the purified water, stir for 35min-40min, then heat up to 140°C, pressure control At 0.30MPa, stir for 140min to complete the exchange reaction, then filter and dry; finally roast at 560°C for 2h to obtain a modified aluminum phosphate molecular sieve of the present invention, its structure is as follows: figure 1 The scanning electron microscope image and figure 2 shown in the crystal phase diagram.

Embodiment 2

[0026] In parts by weight, add 1.5 parts of ZSM-5 molecular sieve to 5 parts of purified water, add 0.48 parts of diammonium hydrogen phosphate and 0.010 parts of zinc nitrate solution in the purified water, stir for 30min-35min, then heat up to 130°C, pressure control At 0.38MPa, stir for 150min to complete the exchange reaction, then filter and dry; finally roast at 590°C for 2h to obtain a modified aluminum phosphate molecular sieve of the present invention, whose structure refers to figure 1 The scanning electron microscope image and figure 2 crystal phase diagram.

Embodiment 3

[0028] In parts by weight, add 0.5 parts of ZSM-5 molecular sieve to 3 parts of purified water, add 0.52 parts of diammonium hydrogen phosphate and 0.010 parts of zinc nitrate solution in the purified water, stir for 30min-35min, then heat up to 150°C, pressure control At 0.18MPa, stir for 130min to complete the exchange reaction, then filter and dry; finally roast at 590°C for 2h to obtain a modified aluminum phosphate molecular sieve of the present invention, whose structure refers to figure 1 The scanning electron microscope image and figure 2 crystal phase diagram.

[0029] Example of application effect

[0030] Take 6 parts of the modified molecular sieves prepared in Examples 1-3 and put them into a ball mill to form small balls, intermittently spray the mixture of 5 parts of aluminum sol solution and 1 part of deionized water, and then dry at 140°C for more than 5 hours, Calcined at 400-600°C for 2-8 hours to obtain the catalyst.

[0031] When the reaction temperatu...

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PUM

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Abstract

The invention provides a modified aluminium phosphate molecular sieve, which is prepared by a ZSM-5 molecular sieve, diammonium phosphate and zinc nitrate, wherein ratio of silica to alumina is 25-40. The preparation method comprises the following steps: adding 0.5-1.5 parts of ZSM-5 molecular sieve in 3-5 parts of purified water according to weight, adding 0.48-0.52 parts of diammonium phosphate and 0.006-0.010 parts of zinc nitrate solution in purified water, stirring for 30-40 minutes, then heating to the temperature of 120-150 DEG C, controlling the pressure at 0.18-0.40MPa, stirring for 120-150 minutes for completing an exchange reaction, then filtering and drying, and finally roasting for 2 hours under the temperature of 530-590 DEG C to obtain the modified ZSM-5 molecular sieve. The modified aluminium phosphate molecular sieve has strong B acid site, crystal phase conversion is not generated through high temperature and hydro-thermal treatment, and the modified aluminium phosphate molecular sieve has good heat and hydro-thermal stability, excellent adsorption performance and cracking performance. The invention also provides a preparation method of the modified aluminium phosphate molecular sieve.

Description

technical field [0001] The invention relates to a molecular sieve, in particular to a modified aluminum phosphate molecular sieve and a preparation method thereof. Background technique [0002] ZSM-5 molecular sieve has high silica-alumina ratio, strong acidity, and low hydrogen transfer activity. It is currently the most widely and important component used in pro-propylene FCC catalysts and additives. However, due to the influence of the hydrothermal stability and activity of ZSM-5, directly using it as a catalytic cracking catalyst usually reduces the conversion rate and gasoline yield, and increases the yield of heavy oil. Therefore, the application of ZSM-5 molecular sieve needs to be modified first to improve its hydrothermal stability and activity. The research on the modification of ZSM-5 molecular sieve has become one of the core technologies in the development of catalysts for increasing production of propylene. [0003] In the prior art, the modification of ZSM-5 ...

Claims

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Application Information

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IPC IPC(8): B01J29/85
Inventor 赵连堂
Owner 鹤壁博文科峰催化技术有限公司
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