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Mesoporous ZSM-5 molecular sieve and preparation method thereof

A ZSM-5, molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, borocarbonane silicone crystalline aluminosilicate zeolite, etc., can solve the complex post-processing method steps, expensive template agent, small mesopore volume, etc. problems, to achieve good industrial application prospects, good structural stability, and the effect of large mesopore volume

Active Publication Date: 2015-06-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the steps of the post-processing method are relatively complicated, and the energy consumption is high. The price of the template agent required by the template agent method is relatively expensive, and it is easy to cause environmental pollution, which increases the cost of synthesis.
[0003] ZSM-5 molecular sieve is the main component of important oil refining catalysts such as FCC catalysts. my country consumes a large amount of ZSM-5 molecular sieves every year. However, most of the synthesis of ZSM-5 molecular sieves uses chemical raw materials, the cost is relatively high, and the mesopore volume is small. , looking for a raw material with abundant reserves of mineral raw materials that can synthesize mesoporous ZSM-5 molecular sieves can not only save the synthesis cost of catalysts, improve the international competitiveness of my country's FCC catalysts, but also play an important role in the full development and utilization of mineral raw materials

Method used

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  • Mesoporous ZSM-5 molecular sieve and preparation method thereof
  • Mesoporous ZSM-5 molecular sieve and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] This embodiment provides a kind of mesoporous ZSM-5 molecular sieve, which is prepared by the following steps:

[0032] Add 450g of distilled water and 13g of sodium hydroxide into the beaker in turn, control the temperature in the beaker to 60°C, add 4.3g of ZSM-5 seed crystals, stir for 0.5h, then add 78g of diatomite, stir for 0.5h to dissolve, then add 2.7g of aluminum sulfate , after stirring for 1 h, the reaction mixture was obtained;

[0033] The reaction mixture was put into a reaction kettle, crystallized at 170°C for 24 hours, then filtered, washed, and dried to obtain ZSM-5 zeolite, which was designated as G-1 sample.

[0034] The relative crystallinity of the mesoporous ZSM-5 molecular sieve determined by XRD ray diffraction is 64%, and the diffraction spectrum whose scanning range 2θ is 5-50° is shown in figure 1 , the median diameter is about 1.65μm (see the pore size distribution diagram figure 2 ), the mesopore volume of the product is 0.058cm higher ...

Embodiment 2

[0041] This embodiment provides a kind of mesoporous ZSM-5 molecular sieve, which is prepared by the following steps:

[0042] Add 335g of distilled water and 6.1g of sodium hydroxide into the beaker in sequence, control the temperature in the beaker to 60°C, add 4.3g of ZSM-5 seed crystals, stir for 0.5h, add 78g of diatomaceous earth, and stir for 1h to obtain a reaction mixture;

[0043] The reaction mixture was put into a reaction kettle, crystallized at 170°C for 24 hours, then filtered, washed, and dried to obtain ZSM-5 zeolite, which was designated as G-2 sample.

[0044] The relative crystallinity of this mesoporous ZSM-5 molecular sieve measured by XRD ray diffraction is 58%, and the XRD spectrogram is similar to Example 1, as figure 1 As shown, the mesoporous volume of the mesoporous ZSM-5 molecular sieve is 0.066cm higher than that of the conventional ZSM-5 molecular sieve 3 g -1 , that is, increased by more than 200%, reaching 0.098cm 3 g -1 . The mesopore vol...

Embodiment 3

[0046] This embodiment provides a kind of mesoporous ZSM-5 molecular sieve, which is prepared by the following steps:

[0047] Add 330g of distilled water and 7.1g of sodium hydroxide to the beaker in turn, control the temperature in the beaker to 60°C, add 4.3g of ZSM-5 seed crystals, stir for 0.5h, add 77g of diatomaceous earth, and stir for 1h to obtain a reaction mixture;

[0048] The reaction mixture was put into a reaction kettle, crystallized at 170°C for 24 hours, then filtered, washed, and dried to obtain ZSM-5 zeolite, which was designated as G-3 sample.

[0049] The relative crystallinity of this mesoporous ZSM-5 molecular sieve measured by XRD ray diffraction is 57%, and the XRD spectrogram is similar to Example 1, as figure 1 As shown, the mesoporous volume of the mesoporous ZSM-5 molecular sieve is 0.047cm higher than that of the conventional ZSM-5 molecular sieve 3 g -1 , which increased by 146%, reaching 0.079cm 3 g -1 .

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Abstract

The invention provides a mesoporous ZSM-5 molecular sieve and a preparation method thereof. The mesoporous ZSM-5 molecular sieve is prepared from natural mineral diatomite as only silicon source or expanded perlite as only aluminum source and has a mesoporous volume of 0.064-0.100cm<3>.g<-1>. The invention also provides a preparation method of the mesoporous ZSM-5 molecular sieve. The mesoporous ZSM-5 molecular sieve can be used in a cracking reaction. Because of abundant mesopores, in the reaction, a catalyst fluidization state is good, a heavy oil macro-molecule approaches to an active center easily, cracking products can be diffused easily, the catalyst has good catalytic activity, and ethene and propylene yields can be improved.

Description

technical field [0001] The invention relates to a mesoporous ZSM-5 molecular sieve directly synthesized from natural minerals and a preparation method thereof, belonging to the technical field of molecular sieve preparation. Background technique [0002] In recent years, my country's refining and processing of crude oil has become increasingly heavy. However, with the development of society, people's demand for fuel has continued to increase. Therefore, reducing heavy oil to light has become an important direction of catalyst research. The catalytic cracking of heavy oil macromolecules requires molecular sieves to have larger pore sizes to improve the accessibility to active centers, while the cracking of small molecules in reaction intermediates requires molecular sieves to provide strong acidity and appropriate micropores. ZSM-5 molecular sieves have strong acidity and good thermal and hydrothermal stability, but their microporous structure makes it difficult for heavy oil...

Claims

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Application Information

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IPC IPC(8): C01B39/38
CPCC01B39/38C01P2002/72C01P2004/52C01P2006/14
Inventor 申宝剑郭艳余倩倩金文龙申波俊王闻年徐盼
Owner BC P INC CHINA NAT PETROLEUM CORP
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