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Preparation method of SBA-15/ZSM-5 composite molecular sieve, catalyst and application in double branched chain isomerization

A technology of ZSM-5 and composite molecular sieves, which is applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low selectivity of double-branched isoparaffins, low yield of isoparaffins, cracking, etc. question

Pending Publication Date: 2021-04-13
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] In order to solve the problem of low selectivity and severe cracking of double-branched isoparaffins caused by single microporous ZSM-5 molecular sieve in catalytic cracking (FCC) gasoline hydroisomerization due to narrow pore channels, small specific surface area and strong acidity, single mesoporous SBA-15 molecular sieve has the problem of low isoparaffin yield due to its weak acidity. The present invention provides a low-cost green preparation method of SBA-15 / ZSM-5 composite molecular sieve material with suitable acidity and stepped pore structure, and Using the composite material as a carrier to support non-noble metals to prepare a sulfur-tolerant double-branched isomerization catalyst

Method used

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  • Preparation method of SBA-15/ZSM-5 composite molecular sieve, catalyst and application in double branched chain isomerization
  • Preparation method of SBA-15/ZSM-5 composite molecular sieve, catalyst and application in double branched chain isomerization
  • Preparation method of SBA-15/ZSM-5 composite molecular sieve, catalyst and application in double branched chain isomerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Activation of natural minerals: Weigh 40g of diatomite powder and roast at 800°C for 6h; weigh 80g of retort earth, 80g of sodium hydroxide, and 300g of water, stir mechanically at room temperature for 1h, then activate in an oven at 200°C for 10h, then Crush and set aside.

[0076] Preparation of ZSM-5 nanocrystal precursor solution: Weigh 10g of activated diatomite, 1.8g of activated rectorite, and 1.5g of NaOH, dissolve 0.2g of seed crystal in 60g of deionized water, and then age in a water bath at 80°C for 4h. The mixture was put into a stainless steel crystallization kettle lined with polytetrafluoroethylene, heated to 170°C for static crystallization for 24h. Cool to room temperature after crystallization, stir evenly and set aside.

[0077] Pre-hydrolysis of silicon-aluminum source of composite material: Add 5 g of the above-mentioned nanocrystalline precursor solution and 5 g of tetraethyl orthosilicate to 18 g of hydrochloric acid solution, then adjust the pH ...

Embodiment 2

[0082] This embodiment provides a SBA-15 / ZSM-5 composite molecular sieve carrier material, the preparation steps are the same as in Example 1, only some parameters are adjusted, as follows:

[0083] Preparation of ZSM-5 nanocrystalline precursor solution: Weigh 8.5g of activated diatomite, 2.7g of 600°C activated bauxite, and 1.3g of NaOH, dissolve 0.14g of seed crystals in 60g of deionized water, and then °C for aging in a water bath for 4 hours, put the mixture into a stainless steel crystallization kettle lined with polytetrafluoroethylene, and raise the temperature to 170°C for static crystallization for 24 hours. Cool to room temperature after crystallization, stir evenly and set aside.

[0084] Pre-hydrolysis of silicon-aluminum source of composite materials: Add 5 g of the above-mentioned nanocrystalline precursor solution and 4.2 g of methyl orthosilicate to 18 g of hydrochloric acid solution, then adjust the pH value of the solution to 4, perform pre-hydrolysis at 60 ...

Embodiment 3

[0089] This embodiment provides a SBA-15 / ZSM-5 composite molecular sieve carrier material, the preparation steps are the same as in Example 1, only some parameters are adjusted, as follows:

[0090] Preparation of ZSM-5 nanocrystalline precursor solution: Weigh 6.9g of activated diatomite, 1g of bauxite activated at 600°C, 1.5g of rectorite, and 0.8g of NaOH, and dissolve 0.17g of seed crystals in 60g of deionized water, and then aged in a water bath at 80°C for 4h, the mixture was put into a stainless steel crystallization kettle with a polytetrafluoroethylene liner, and the temperature was raised to 170°C for static crystallization for 24h. Cool to room temperature after crystallization, stir evenly and set aside.

[0091] Pre-hydrolysis of the silicon-aluminum source of the composite material: add 5 g of the above-mentioned nanocrystalline precursor solution and 4 g of methyl orthosilicate to 20 g of hydrochloric acid solution, then adjust the pH value of the solution to 5,...

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Abstract

The invention relates to the field of petroleum processing, discloses a preparation method of an SBA-15 / ZSM-5 composite molecular sieve material and application in double branched chain isomerization, and in particular relates to a low-cost green preparation method of an SBA-15 / ZSM-5 composite molecular sieve material with proper acidity and a stepped pore channel structure and a sulfur-tolerant double-branched-chain isomerization catalyst prepared by loading non-noble metals on the SBA-15 / ZSM-5 composite molecular sieve material. The catalyst is applied to a catalytic cracking (FCC) gasoline hydroisomerization reaction. According to the invention, a ZSM-5 molecular sieve nanocrystalline precursor solution is greenly synthesized by taking natural minerals as raw materials without a template agent, and then the SBA-15 / ZSM-5 composite molecular sieve carrier is prepared through in-situ assembly by adopting a low-acidity prehydrolysis method, so that the production cost is greatly reduced, the equipment corrosion is relieved, and the pollutant emission is reduced. Therefore, the method provided by the invention has good economic and environmental benefits, and provides technical support for promoting the industrialization process.

Description

technical field [0001] The invention relates to the field of petroleum processing, in particular to a preparation method of an SBA-15 / ZSM-5 composite molecular sieve material and its application in double branched chain isomerization. Background technique [0002] Since 2019, my country has gradually implemented strict national VI gasoline emission standards nationwide, which further increases the requirements for oil product upgrading technology. Catalytic cracking (FCC) gasoline has always been the main blending component of motor gasoline in my country. The main difficulty in upgrading the quality of oil products in my country is to reduce the olefins in gasoline while maintaining the octane number. Isomerized oil has high octane number and low sulfur content, and does not contain olefins, aromatics, and benzene. Therefore, alkane isomerization has become a research hotspot in the field of producing high-octane gasoline. [0003] Molecular sieve is one of the most commonl...

Claims

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Application Information

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IPC IPC(8): B01J29/80C10G45/64
CPCB01J29/005C10G45/64B01J29/0333B01J29/46B01J2229/186C10G2300/1044C10G2300/104
Inventor 岳源源康颖鲍晓军王廷海向永生常晓昕姚文君张永泽谢元李景锋高海波王高峰
Owner PETROCHINA CO LTD
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