Boron modified HZSM-5 molecular sieve, preparation method and application thereof

A technology of ZSM-5 and molecular sieve, which is applied in molecular sieve catalysts, chemical instruments and methods, and hydrocarbon production from oxygen-containing organic compounds. problem, to achieve the effects of short diffusion path length, low production cost, and reduced secondary reactions

Inactive Publication Date: 2017-05-31
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is usually necessary to add an organic template agent during hydrothermal synthesis, which will not only increase the cost, but also cause environmental pollution caused by the waste liquid discharged after hydrothermal synthesis, and when the ratio of silicon to aluminum is increased, crystallization will form in the ea

Method used

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  • Boron modified HZSM-5 molecular sieve, preparation method and application thereof
  • Boron modified HZSM-5 molecular sieve, preparation method and application thereof
  • Boron modified HZSM-5 molecular sieve, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Dissolve 9.0g sodium hydroxide, 65.6g coarse-porous silica gel, 0.6g sodium metaaluminate, and 0.22g boric acid in 120g deionized water, add 0.25g sodium chloride, add nitric acid to adjust the gel to neutral, and then add hydroxide Adjust the pH to 10-12 with sodium, add seed crystals accounting for 2.0wt% of the total feeding amount, stir evenly, put the reaction mixed gel into a stainless steel crystallization kettle, crystallize at 100°C for 30h, and crystallize at 160°C 24h. The crystallized product was washed to pH = 7-9, and dried at 100° C. for 10-12 hours.

[0043] Put the above sample in 1mol·L -1 Ammonium nitrate solution, wherein the quality of molecular sieve: NH 4 NO 3 Solution volume = 1(g): 10(mL), stirred in a water bath at 70°C for 2h, then washed and filtered with deionized water, the above steps were repeated 3 times; after filtration, the solid was dried at 100°C for 12h, calcined at 550°C for 5h, and the sample Press into tablets and sieve 10-2...

Embodiment 2

[0047] Repeat the operation steps of embodiment 1, difference is that the charging amount of boric acid is 0.45g.

[0048] According to X-ray diffraction analysis, the solid product is ZSM-5 molecular sieve with a relative crystallinity of 98%. The molecule was evaluated with a one pot yield of 22.7 wt%.

Embodiment 3

[0050] Repeat the operating steps of Example 1, except that the charging amount of boric acid is 0.67g.

[0051] According to X-ray diffraction analysis, the solid product is ZSM-5 molecular sieve with a relative crystallinity of 99%. The molecular sieve was evaluated, and the yield in one pot was 22.0wt%.

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Abstract

The invention discloses a method for preparing nanoscale boron modified HZSM-5 by seed crystal directing. The method comprises the steps as follows: (1) mixing an aluminum source, a silicon source, an alkali source, a boron source, ZSM-5 molecular sieve seed crystals and water, adjusting the pH of an obtained mixture to 10-12 and mixing the mixture uniformly to form gel; (2) crystallizing the gel in a reactor, and performing solid-liquid separation, washing and drying on a crystallized product to obtain a dried crystallized product; (3) adding the dried crystallized product in an ammonium salt solution for ion exchange to obtain an ammonia type ZSM-5 molecular sieve; (4) roasting the ammonia type ZSM-5 molecular sieve to obtain HZSM-5. The invention further discloses a molecular sieve prepared by the method and application of the molecular sieve in a reaction of methanol to propylene. The boron modified HZSM-5 requires no roasting of a template agent and is environment-friendly, the propylene yield and the service life are greatly increased, the selectivity of propylene reaches 44.0wt% or higher, and the service life reaches 500 h or longer.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve preparation, and relates to a method for preparing modified ZSM-5, in particular to a seed-guided method for preparing nano-scale boron-modified HZSM-5 molecular sieve, the prepared molecular sieve and its application in methanol to propylene in the application. Background technique [0002] ZSM-5 is an important solid acid catalyst in the chemical industry and the main active component of methanol to propylene (MTP) catalyst. Improving the selectivity of propylene and the service life of the catalyst are particularly important for the MTP process, and one of the research focuses is the preparation and modification of ZSM-5. [0003] The nano-scale ZSM-5 molecular sieve has the advantages of large specific surface area, short pore channel, high catalytic activity, strong anti-coking ability and good stability (CN 1608990 A). The reaction of methanol on ZSM-5 molecular sieve is seriously ...

Claims

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Application Information

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IPC IPC(8): C01B39/38B82Y30/00B82Y40/00B01J29/40C07C1/20C07C11/06
CPCY02P20/52C01B39/38B01J29/40C01P2002/72C01P2002/80C01P2004/03C01P2004/64C07C1/20C07C11/06
Inventor 安良成江永军王林齐静宋彩霞颜蜀儁刘素丽关翀张伟雍晓静罗春桃
Owner CHNA ENERGY INVESTMENT CORP LTD
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