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Alkane double-branch isomerization catalyst and preparation method thereof

A catalyst and double-branched technology, applied in catalyst activation/preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as two-phase separation and difficulty in recombination

Active Publication Date: 2021-07-02
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nano-assembly technology developed in recent years provides an ideal way for the preparation of micro-mesoporous composite molecular sieves, but the existing assembly technology level is difficult to realize the in-situ controllable growth of Beta molecular sieves on the surface of mesoporous molecular sieves, and the prepared composite carriers are often Only microporous molecular sieves and mesoporous molecular sieves are physically simple to compound, and there may even be a phenomenon that the two phases are separated and difficult to compound

Method used

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  • Alkane double-branch isomerization catalyst and preparation method thereof
  • Alkane double-branch isomerization catalyst and preparation method thereof
  • Alkane double-branch isomerization catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The preparation method of Pt / (Beta-SBA-15) alkane double-branched isomerization catalyst comprises the steps:

[0034] (1) Preparation of mesoporous SBA-15 molecular sieve matrix. At 40°C, mix 20 g of triblock copolymer P123, 40 g of cetyltrimethylammonium bromide, 450 mL of 2 mol / L hydrochloric acid and 300 mL of deionized water until evenly stirred; Then add 42.8 g of tetraethyl orthosilicate and continue to stir for 24 h; finally add it to a stainless steel reactor with a polytetrafluoroethylene liner, crystallize at 100 ° C for 72 h, cool down, filter and wash , drying and roasting to obtain pure silicon SBA-15 mesoporous molecular sieves.

[0035] (2) Preparation of microporous Beta molecular sieve nanocrystal precursor slurry. Stir 0.49 g aluminum isopropoxide, 24.6 g deionized water, 9.57 g tetraethylammonium hydroxide (35%), and 13.15 g tetraethyl orthosilicate evenly, adjust the pH value of the slurry to 11.8, and continue stirring for 6 h to obtain An initi...

Embodiment 2

[0039] Identical to the synthesis steps and method in Example 1, the difference is that H in Example 1 step (4) 2 PtCl 4 The solution was changed to (NH 3 ) 4 Pt(NO 3 ) 2 solution. The final product name is C-2. The mass composition of the final catalyst is: mesoporous SBA-15 molecular sieve: microporous Beta molecular sieve: metal Pt=76.1:23.4:0.5.

Embodiment 3

[0041] Identical to the synthesis steps and method in Example 1, the difference is that H in Example 1 step (4) 2 PtCl 4 Solution ((CH 3 ) 2 NCH 2 CH 2 N(CH 3 ) 2 ) 2 Pt(NO 3 ) 2 solution. The final product name is C-3. The mass composition of the final catalyst is: mesoporous SBA-15 molecular sieve: microporous Beta molecular sieve: metal Pt=76.1:23.4:0.5.

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Abstract

The invention relates to an alkane double-branch isomerization catalyst and a preparation method thereof. The catalyst is prepared by loading Pt on the surface of a Beta / SBA-15 composite carrier material, the Beta / SBA-15 composite carrier material is prepared by adopting a ball-milling crystallization method, Beta molecular sieve nanocrystals and an SBA-15 molecular sieve matrix are mixed under the ball-milling condition, the mixture is heated to the crystallization temperature of a Beta molecular sieve to complete the crystallization process, and filtering, washing and drying are conducted to obtain the composite carrier material assembled by the Beta molecular sieve in the SBA-15 mesoporous channel. The metal Pt is loaded on the surface of the Beta / SBA-15 composite carrier material by an excessive impregnation method which is commonly used in the field in essence. The Pt / (Beta / SBA-15) catalyst disclosed by the invention shows higher alkane isomerization conversion rate and liquid yield when being used in alkane isomerization reaction, and is particularly beneficial to the generation of double-branch alkane.

Description

technical field [0001] The invention relates to an alkane double-branched isomerization catalyst and a preparation method thereof. Beta molecular sieves are assembled into the mesoporous channels of SBA-15 by ball milling crystallization to obtain a Beta-SBA-15 composite carrier material, and then the metal Pt is loaded On the surface of the composite carrier, a Pt / (Beta-SBA-15) alkane double-branched isomerization catalyst is obtained. The catalyst has the advantages of high alkane isomerization conversion rate, low cracking by-products and good double-branch isomerization selectivity. Background technique [0002] In order to control the air pollution caused by vehicle exhaust emissions, my country has accelerated the pace of upgrading the quality of motor gasoline, and implemented the National IV (olefin content <28 v%, aromatics 40 v%), China V (olefin content <24 v%, aromatics content <40 v%) and China VI (A) (olefins content <18 v%, aromatics content <35...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01J29/74B01J35/10B01J37/00B01J37/02C10G45/64
CPCB01J29/005B01J37/0205B01J37/0036C10G45/64B01J2229/18B01J2229/62B01J35/617B01J35/64B01J35/635B01J35/633
Inventor 鲍晓军张航王廷海王鹏照岳源源崔勍焱
Owner FUZHOU UNIV