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Mesoporous selective molecular sieve and preparation method thereof

A type-selective molecular sieve and molecular sieve technology, applied in the direction of molecular sieve catalysts, molecular sieves and base exchange compounds, chemical instruments and methods, etc., can solve problems that have not been involved in mesoporous composite IM-5 molecular sieves, and achieve good catalytic activity and use Longevity, raw material cost environmental protection, high yield effect

Inactive Publication Date: 2017-11-07
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no research on the post-treatment preparation of mesoporous composite IM-5 molecular sieves.

Method used

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  • Mesoporous selective molecular sieve and preparation method thereof
  • Mesoporous selective molecular sieve and preparation method thereof
  • Mesoporous selective molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a method for preparing the mesoporous IM-5 molecular sieve, which includes the following steps:

[0038] Step 1: Directly prepare Na-type microporous IM-5 zeolite with low silicon-to-aluminum ratio (Si / Al=10) through traditional hydrothermal synthesis.

[0039] Step 2: Add the low silicon-aluminum ratio IM-5 zeolite synthesized in Step 1 to the NaOH solution with a concentration of 0.2mol / L, the mass ratio of solid to liquid is 1:20, stir for 2h under the condition of 70℃ water bath, filter, The mesoporous IM-5 zeolite is obtained by washing and drying, which is recorded as IM-5A sample;

[0040] The relative crystallinity of the product determined by XRD ray diffraction is 96%, and the mesopore volume of the product is 0.149cm higher than that of the conventional ZSM-5 molecular sieve. 3 g -1 That is an increase of about 133%, reaching 0.261cm 3 g -1 (For pore volume distribution see image 3 ).

Embodiment 2

[0042] This embodiment provides a method for preparing the mesoporous IM-5 molecular sieve, which includes the following steps:

[0043] Step 1: Directly prepare Na-type microporous IM-5 zeolite with low silicon-to-aluminum ratio (Si / Al=13) through traditional hydrothermal synthesis.

[0044] Step 2: Add the low silicon-aluminum ratio IM-5 zeolite synthesized in step 1 to the NaOH solution with a concentration of 0.2mol / L, the mass ratio of solid to liquid is 1:10, stir for 2h under the condition of 70℃ water bath, filter, The mesoporous IM-5 zeolite was obtained by washing and drying, which was recorded as IM-5B sample;

[0045] The relative crystallinity of the product determined by XRD ray diffraction is 94%, and the mesopore volume of the product is increased by 0.180cm compared with the conventional ZSM-5 molecular sieve. 3 g -1 That is an increase of about 161%, reaching 0.292cm 3 g -1 (For pore volume distribution see Figure 4 ).

Embodiment 3

[0047] This embodiment provides a method for preparing the mesoporous IM-5 molecular sieve, which includes the following steps:

[0048] Step 1: Directly prepare Na-type microporous IM-5 zeolite with low silicon to aluminum ratio (Si / Al=14) through traditional hydrothermal synthesis.

[0049] Step 2: Add the low silicon-aluminum ratio IM-5 zeolite synthesized in step 1 to the NaOH solution with a concentration of 0.2mol / L, the mass ratio of solid to liquid is 1:20, and stir for 3h under the condition of 60℃ water bath, filter, The mesoporous IM-5 zeolite is obtained by washing and drying, which is recorded as IM-5C sample;

[0050] The relative crystallinity of the product determined by XRD ray diffraction is 94%, and the mesopore volume of the product is 0.158cm higher than that of the conventional ZSM-5 molecular sieve. 3 g -1 That is an increase of about 141%, reaching 0.270cm 3 g -1 (For pore volume distribution see Figure 5 ).

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Abstract

The invention provides a mesoporous selective molecular sieve and a preparation method thereof. The mesoporous selective molecular sieve is obtained by performing alkali treatment on IM-5 zeolite with the silica-alumina ratio being 10 to 14. The preparation method comprises the following steps that the IM-5 zeolite is added into an alkali treatment solution for alkali treatment; after filtering, washing and drying, the mesoporous selective molecular sieve is obtained, wherein the alkali treatment solution comprises one or a combination of several of a NaOH solution, a KOH solution, a TPAOH solution and a TBAOH solution. The mesoporous IM-5 molecular sieve can be applied to cracking reaction; the mesoporous IM-5 molecular sieve has rich mesopores, so that in the reaction process, the catalyst fluidizing state is better; heavy oil macromolecules can easily approach to the active center; cracked products can be easily diffused; the yield of ethylene and propylene is relatively high; catalysts cannot generate carbon deposition, so that the catalysts have good catalytic activity and long service life.

Description

Technical field [0001] The invention relates to a mesoporous selective molecular sieve and a preparation method thereof, and belongs to the technical field of molecular sieve preparation. Background technique [0002] In recent years, my country's oil refining and processing crude oil has become increasingly heavy. However, with the development of society, people's demand for fuel has continued to increase. Therefore, lightening heavy oil has become an important direction of catalyst research. The catalytic cracking of heavy oil macromolecules requires molecular sieves to have a larger pore size to improve accessibility to the active center, while the cracking of small molecules in the reaction intermediate product requires molecular sieves to provide strong acidity and appropriate micropores. IM-5 is a kind of high-silica molecular sieve, and its pore size is 0.53nm×0.59nm. It is a new type of selective zeolite, making it more widely used in the petrochemical industry. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02B01J29/70C10G11/05
CPCC01B39/026B01J29/70C01P2004/03C01P2004/04C01P2006/14C01P2006/17C10G11/05C10G2400/20
Inventor 申宝剑余倩倩郭巧霞王艳丹申波俊申宝华牛庆静彭博文韩华军
Owner BC P INC CHINA NAT PETROLEUM CORP
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