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Method for preparing isohexadecane by using Pd-supported SAPO-31 molecular sieve nanocrystalline bifunctional catalyst

A SAPO-31, dual-function catalyst technology, applied in the field of isoparaffin production, can solve the problems of large grain size of micron molecular sieve, reduced isomerization reaction selectivity, increased catalyst cost, etc. The effect of improving yield, high reactivity and isomerization selectivity

Active Publication Date: 2019-10-15
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem that the high loading capacity of noble metals in the catalyst prepared by the prior art causes the cost of the catalyst to increase, and the micron molecular sieve grain size used in the existing catalyst is large, and the selectivity of the isomerization reaction is reduced. Problem; And provide a kind of method that utilizes the SAPO-31 molecular sieve nano crystal bifunctional catalyst of carrying Pd to prepare isohexadecane

Method used

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  • Method for preparing isohexadecane by using Pd-supported SAPO-31 molecular sieve nanocrystalline bifunctional catalyst
  • Method for preparing isohexadecane by using Pd-supported SAPO-31 molecular sieve nanocrystalline bifunctional catalyst
  • Method for preparing isohexadecane by using Pd-supported SAPO-31 molecular sieve nanocrystalline bifunctional catalyst

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specific Embodiment approach 1

[0017] Specific embodiment 1: This embodiment is a method for preparing isohexadecane by using a Pd-loaded SAPO-31 molecular sieve nanocrystalline bifunctional catalyst, which is specifically completed according to the following steps:

[0018] Using Pd-loaded SAPO-31 molecular sieve nanocrystals as a bifunctional catalyst, the hydroisomerization reaction of n-hexadecane is carried out on a fixed-bed reactor to produce isohexadecane; the Pd-loaded SAPO-31 molecular sieve The loading amount of Pd in ​​the nanocrystalline bifunctional catalyst is 0.02wt% ~ 0.09wt%; the yield of isohexadecane reaches over 75%, and the proportion of multi-branched isomers in isohexadecane reaches over 50% .

specific Embodiment approach 2

[0019] Specific embodiment two: The difference between this embodiment and specific embodiment one is: the SAPO-31 molecular sieve nanocrystalline bifunctional catalyst loaded with Pd is prepared according to the following steps:

[0020] 1. Preparation of SAPO-31 molecular sieve nanocrystals: phosphoric acid as phosphorus source, pseudoboehmite as aluminum source, silica sol as silicon source, di-n-butylamine as template, 1-octyl-3-methyl chloride Imidazole is a crystal growth inhibitor. Add phosphorus source, aluminum source, silicon source, template agent and crystal growth inhibitor to deionized water in sequence, stir evenly to make initial gel, crystallize at 160-180°C for 12h-36h, Synthesize SAPO-31 molecular sieve nanocrystals, and the grain size of SAPO-31 molecular sieve nanocrystals is 30nm~50nm; the chlorinated 1-octyl-3-methylimidazole and pseudoboehmite in the initial gel Al 2 o 3 The molar ratio is 0.4:1;

[0021] 2. Loading Pd: SAPO-31 molecular sieve nanocr...

specific Embodiment approach 3

[0023] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the particle size of the bifunctional catalyst is 20-40 mesh. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for preparing isohexadecane by using a Pd-supported SAPO-31 molecular sieve nanocrystalline bifunctional catalyst, and relates to a method for preparing isoparaffin byadopting the bifunctional catalyst through n-alkane hydroisomerization reaction. The invention aims to solve the problems that the cost of the catalyst is increased due to high loading capacity of noble metals in the catalyst prepared in the prior art, and the selectivity of isomerization reaction is reduced due to large grain size of a micron-sized molecular sieve adopted by the existing catalyst. The method comprises the following steps: with the Pd-supported SAPO-31 molecular sieve nanocrystalline as a bifunctional catalyst, carrying out n-hexadecane hydroisomerization reaction on a fixedbed reactor to prepare isohexadecane. The method has the advantages that the loading capacity of Pd is 0.02 wt%-0.09 wt%; and the proportion of polybranched isomers in the isohexadecane reaches more than 50%. The method is mainly used for preparing isohexadecane.

Description

technical field [0001] The invention relates to a method for preparing isoparaffins through hydroisomerization reaction of normal paraffins by using a bifunctional catalyst. Background technique [0002] With the rapid development of the global economy, the demand for energy is increasing day by day, and the massive consumption and non-renewability of traditional fossil energy pose a higher challenge to the efficient use of existing energy. my country's energy distribution is rich in coal, short of gas, and low in oil. my country's dependence on foreign oil continues to increase, but coal reserves are abundant. Therefore, making full use of my country's abundant coal resources to develop non-petroleum routes to produce fuel oil and other petroleum products is of great significance for solving my country's oil shortage, substitution of petroleum raw materials, and clean oil products. [0003] The production of Fischer-Tropsch synthetic oil with n-alkanes of different carbon ...

Claims

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Application Information

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IPC IPC(8): C07C5/27B01J29/85C07C9/22
CPCC07C5/2791B01J29/85B01J2229/18C07C2529/85C07C9/22Y02P30/20
Inventor 吴伟郭春牧白雪峰王巍贾国志
Owner HEILONGJIANG UNIV
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