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SAPO-11 molecualr sieve and its preparing method

A technology of SAPO-11 and molecular sieve, which is applied in the direction of molecular sieve catalyst, molecular sieve and alkali-exchanged phosphate, molecular sieve characteristic silicoaluminophosphate, etc., can solve the unfavorable industrial scale-up and production of SAPO-11 molecular sieve, reduce catalytic performance, SAPO-11 Not easy to repeat and other problems, to achieve excellent reaction performance, high Si content, good effect

Inactive Publication Date: 2003-01-22
FUDAN UNIV
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AI Technical Summary

Problems solved by technology

However, for the conventional hydrothermal method, the obtained SAPO-11 is not easy to repeat, and it is easy to form more Si regions to reduce the catalytic performance. These two shortcomings are not conducive to the industrial scale-up and production of SAPO-11 molecular sieves.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] Example 1. Put 5.0g of pseudo-boehmite in 20mL of distilled water and stir vigorously, add dropwise 5.0ml of phosphoric acid, and stir evenly at 15°C; at the same time, in another beaker, 0.2g of hexadecyltrimethyl bromide Stir ammonium in 40ml of n-hexanol, add 1.8ml of tetraethyl orthosilicate, and stir evenly at 15°C; mix the two mixtures together and stir vigorously, and slowly add 6.0ml of n-dipropylamine dropwise, and continue stirring for 1 hour; Put it into a stainless steel reactor with a polytetrafluoroethylene liner, then crystallize at 180°C for 48 hours, take it out, cool, filter, dry at 80°C, and roast at 550°C for 20 hours to obtain the roasted SAPO- 11 samples. After the sample is loaded with 0.5wt% palladium, the isomer yield can reach 80% in the hydroisomerization reaction of n-dodecane.

[0022] Example 2. 5.0ml of phosphoric acid was placed in 20mL of distilled water and stirred, and 5.0g of pseudo-boehmite was added in batches, and vigorously stirr...

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PUM

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Abstract

The present invention provides a synthesis process of SAPO-11 molecular sieve. Available technology adopts conventional hydrothermal method, which is non-repeatable and easy to produce many Si areas to degrade catalytic performance. The present invention is that in a water-surfactant-organic alcohol system, nano level SAPO-11 molecular sieve with high repeatability, less Si areas and more strong B acid is synthesized. After carrying noble metal, the molecular sieve has high selectivity, yield and repeatability while being used in hydrogensing isomerization reaction of long-chain alkane.

Description

technical field [0001] The invention relates to a SAPO-11 molecular sieve and a preparation method thereof. Background technique [0002] The main components of lubricating oil are some long-chain alkanes with high boiling points. Through hydroisomerization, some of the straight-chain molecules are converted into branched molecules, thereby increasing its viscosity, reducing the pour point, and significantly improving its low temperature performance. Due to its special structure and acid properties, SAPO-11 molecular sieve has excellent hydroisomerization performance after supporting noble metals, which makes it attract much attention as an acidic support for isomerization dewaxing catalyst. [0003] SAPO-11 molecular sieve has AEL topological structure, one-dimensional channel of ten-membered ring, and its channel size is 0.39×0.63nm. Because Si atoms enter the framework, SAPO-11 molecular sieve has moderate acidity. If two Si atoms simultaneously replace adjacent P atoms...

Claims

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Application Information

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IPC IPC(8): B01J29/85C01B37/08C01B39/54
Inventor 李全芝黄茜丹王利军
Owner FUDAN UNIV
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