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Mesoporous molecular sieve catalyst and preparation method thereof

A technology of mesoporous molecular sieves and catalysts, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of improved selectivity, reduced cracking reactions, high olefin oligomerization activity and diesel yield

Active Publication Date: 2015-04-15
SYNFUELS CHINA INNER MONGOLIA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on the use of mesoporous molecular sieve MSU-SMFI as olefin oligomerization catalyst

Method used

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  • Mesoporous molecular sieve catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1, preparation catalyst Na / MSU-S MFI

[0034] (1) Dissolve 5.81g of hexamethylenediamine in 41.27g of deionized water, add 40g of silica sol (containing 30% SiO 2 ), configured as solution A, dissolved 0.55g sodium metaaluminate and 1.18g NaOH in 14.25g deionized water to form solution B, added solution B dropwise to solution A while stirring, and filled the obtained solution into 100ml In a closed autoclave, hydrothermal crystallization was carried out at 50°C for 1 day to obtain MFI seed crystals.

[0035] (2) Dissolve 18.22g of cetyltrimethylammonium bromide (CTAB) in 130g of deionized water, heat in a 40°C water bath until the solution is clear, add the MFI seed crystal prepared in step (1) while stirring, and then With 2.0M H 2 SO 4 The pH value of the solution was quickly adjusted to 9.0, and after stirring for 2 hours, it was loaded into a stainless steel reactor lined with polytetrafluoroethylene, and the temperature was raised from room temperatu...

Embodiment 2

[0042] Embodiment 2, preparation catalyst ZrNa / MSU-S MFI

[0043] (1) Prepare Na / MSU-S according to the method in Example 1 MFI sample.

[0044] (2) Weigh a certain amount of formed Na / MSU-S MFI Molecular sieves were impregnated in zirconium nitrate solution and evacuated to dryness. After drying at 120 °C for 3 h, the dried catalyst was put into a muffle furnace and calcined at 500 °C for 4 h to obtain the modified ZrNa / MSU-S MFI Molecular sieve catalyst, the weight percent content of Zr in the catalyst is 1.0wt%, Na + The content of 0.38wt%, Na / MSU-S MFI The content of aluminum oxide is 79wt%, and the content of alumina is 20wt%.

[0045] The catalyst prepared by this embodiment is used for olefin oligomerization, at N 2 Under the condition of existence, the process conditions of olefin oligomerization reaction in Fischer-Tropsch synthesis LPG (the composition is the same as that in Example 1) are as follows: operating pressure is 4.0MPa, reaction temperature is 250°C...

Embodiment 3

[0047] Embodiment 3, preparation catalyst LaZrNa / MSU-S MFI

[0048] (1) Prepare Na / MSU-S according to the method in Example 1 MFI sample.

[0049] (2) Weigh a certain amount of formed Na / MSU-S MFI Molecular sieves are impregnated in a mixed solution of zirconium nitrate and lanthanum nitrate, and evacuated to dryness. After drying at 120 °C for 3 h, the dried catalyst was put into a muffle furnace and calcined at 500 °C for 4 h to obtain the modified LaZrNa / MSU-S MFI Molecular sieve catalyst, the weight percentage content of Zr and La in the catalyst is 1.0wt%, Na + The content is 0.37wt%, Na / MSU-S MFI The content of aluminum oxide is 78wt%, and the content of alumina is 20wt%.

[0050] The catalyst prepared by this embodiment is used for olefin oligomerization, at N 2 Under the condition of existence, the process conditions of olefin oligomerization reaction in Fischer-Tropsch synthesis LPG are: operating pressure is 4.0MPa, reaction temperature is 250℃, N 2 The / olef...

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Abstract

The invention discloses a mesoporous molecular sieve catalyst and a preparation method thereof. The mesoporous molecular sieve catalyst comprises a matrix, an active component and a binder; the matrix is an H-type MSU-SMFI mesoporous molecular sieve; the active component is Na; and the binder is alumina. The preparation method comprises the following steps: 1, carrying out ion exchange of an MSU-SMFI mesoporous molecular sieve with an NH4NO3 solution, and roasting to obtain the H-type MSU-SMFI mesoporous molecular sieve; 2, carrying out ion exchange of the H-type MSU-SMFI mesoporous molecular sieve and an NaNO3 solution, adding the alumina binder and a nitric acid solution after the ion exchange, grinding, carrying out extrusion molding, and roasting; and / or 3, dipping the mesoporous molecular sieve obtained in step 2 in an aqueous solution containing at least one of a lanthanum salt and a zirconium salt, and drying and stoving. High olefin oligomerization activity and high diesel yield can be obtained through adopting the mesoporous molecular sieve MSU-SMFI as the matrix of an olefin oligomerization catalyst.

Description

technical field [0001] The invention relates to a mesoporous molecular sieve catalyst and a preparation method thereof. Background technique [0002] Oligomerization of low-carbon olefins can be used to synthesize environmentally friendly liquid fuels, and the content of aromatics in the products is very low. At present, there are already mature olefin oligomerization technologies abroad, but mainly for C 2 ~C 4 The oligomerization reaction of olefins, the reaction product is mainly oligomerized gasoline. With the rapid growth of diesel consumption and environmental protection requirements, my country's resources and technology status determine that the diesel-gasoline ratio in the production of liquid fuels using petroleum as raw materials is low, and the grade is low, which is far from meeting the demand. Fischer-Tropsch synthesis product LPG contains a considerable amount of olefins, which can produce oligomerized gasoline and oligomerized diesel oil through oligomeriz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/70C07C2/12C07C11/02C10G50/00
Inventor 黄丽华王新娟王虎林徐智陶智超杨勇李永旺
Owner SYNFUELS CHINA INNER MONGOLIA CO LTD
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