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Modified ZSM-35 molecular sieve and preparation method thereof

A ZSM-35 and molecular sieve technology, applied in the field of modified ZSM-35 molecular sieve and its preparation, to achieve the effect of improving selectivity and ensuring strength

Active Publication Date: 2019-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method uses ZSM-35 molecular sieve powder as raw material, and uses a pore-enlarging agent to improve the secondary pore distribution and pore size of the ZSM-35 molecular sieve, thereby effectively solving the problem of diffusion of reactants and products, thereby improving the selectivity of the catalyst, and at the same time The secondary pores with appropriate size and uniform distribution also ensure the strength of the molecular sieve

Method used

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  • Modified ZSM-35 molecular sieve and preparation method thereof
  • Modified ZSM-35 molecular sieve and preparation method thereof
  • Modified ZSM-35 molecular sieve and preparation method thereof

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preparation example Construction

[0038] Therefore, the preparation method of the modified ZSM-35 molecular sieve provided by the present invention can be understood as a method for improving the secondary pore distribution of the ZSM-35 molecular sieve, which includes:

[0039] Step A, uniformly mixing ZSM-35 molecular sieve powder and alumina powder to obtain a ZSM-35 molecular sieve-alumina mixture;

[0040] Step B, adding a dilute acid solution to the ZSM-35 molecular sieve-alumina mixture for kneading to obtain an acidified ZSM-35 molecular sieve-alumina mixture;

[0041] Step C, adding a pore expander and deionized water to the prepared acidified ZSM-35 molecular sieve-alumina mixture for kneading to obtain a modified ZSM-35 molecular sieve precursor mixture;

[0042] In step D, the prepared catalyst precursor mixture is molded and extruded, then dried and calcined to obtain a modified ZSM-35 molecular sieve.

[0043]According to some embodiments of the present invention, the alumina powder includes one...

Embodiment 1

[0068] (1) Mix 250g ZSM-35 molecular sieve powder with 89.3g pseudo-boehmite (Al 2 o 3 Content is 70%) add in the mixer and mix, after mixing evenly, make ZSM-35 molecular sieve-alumina mixture;

[0069] (2) Add 99.2g dilute hydrochloric acid (HCl content is 6.3%) solution to the ZSM-35 molecular sieve-alumina mixture and knead to prepare the acidified ZSM-35 molecular sieve-alumina mixture;

[0070] (3) Add 15.6 g of cellulose to the prepared acidified ZSM-35 molecular sieve-alumina mixture, then add 39.7 g of deionized water and knead to obtain a modified ZSM-35 molecular sieve precursor mixture;

[0071] (4) Put the prepared modified ZSM-35 molecular sieve precursor mixture into an extruder for molding, dry the formed molecular sieve at 120°C, transfer the dried molecular sieve to a muffle furnace at 450°C Calcined for 4h to prepare modified ZSM-35 molecular sieve.

[0072] The prepared modified ZSM-35 molecular sieve was subjected to BET analysis, and the result showed ...

Embodiment 2

[0074] The difference from Example 1 is that the amount of ZSM-35 molecular sieve powder is changed to 300g, the aluminum source is changed to γ-alumina (alumina content 100%), and the consumption is 75g, and the acid is changed to dilute sulfuric acid, and the consumption is 297.6 g, the pore expander was changed to petroleum coke, the dosage was 26.3g, the amount of deionized water was changed to 208.3g, the drying temperature was changed to 110°C, the roasting temperature was changed to 500°C, the roasting time was changed to 10h, and the remaining components and conditions constant.

[0075] The prepared modified ZSM-35 molecular sieve was subjected to BET analysis, and the result showed that the secondary pore diameter of the prepared modified ZSM-35 molecular sieve was concentrated in 3-4nm, and the intensity was 87N.

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Abstract

The invention provides a modified ZSM-35 molecular sieve and a preparation method thereof. According to the preparation method, a pore-enlarging agent is used for improving the secondary pore distribution and pore size of the ZSM-35 molecular sieve and added in the ZSM- 35 molecular sieve forming stage, the added pore-enlarging agent is gasified through high temperature calcination to produce pores with specific sizes, the pores with the uniform sizes expand the secondary pore distribution range of the molecular sieve, and the appropriate-size uniformly distributed secondary pores effectivelysolve the diffusion problems of reactants and products, thus improving the selectivity of catalyst. At the same time, the appropriate-size uniformly distributed secondary pores ensure the strength ofthe molecular sieve.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve preparation, and relates to a modified ZSM-35 molecular sieve and a preparation method thereof. Background technique [0002] ZSM-35 molecular sieve is a mesoporous zeolite with Ferrierite (FER) topological structure. It has a vertically crossed two-dimensional channel structure. The size of the ten-membered ring channel parallel to the (001) crystal plane is 0.54nm×0.42nm. The size of the eight-membered ring channel parallel to the (010) crystal plane is 0.48nm×0.35nm. ZSM-35 molecular sieve was first successfully developed by the American Mobil Company in 1977. This kind of molecular sieve with vertically intersecting two-dimensional pore structure can be widely used in various catalytic reactions of hydrocarbon conversion, such as isomerization and aromatization. , polymerization reaction, etc., and exhibited excellent catalytic performance. [0003] In the application process of ZSM-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02
CPCC01B39/026C01P2006/16C01P2006/17
Inventor 吴凯任行涛赵岚贾志光杨怀军裴庆君
Owner CHINA PETROLEUM & CHEM CORP
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