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Catalyst for normal paraffin hydroisomerization reaction and preparation method as well as application thereof

A technology for hydroisomerization and normal alkanes, applied in the field of catalysts

Inactive Publication Date: 2012-09-12
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] So far, there is no known about the introduction of mesoporous ZSM-12 zeolite molecular sieve by alkali treatment modification as a carrier, supporting Pt to prepare catalysts for alkane isomerization reactions

Method used

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  • Catalyst for normal paraffin hydroisomerization reaction and preparation method as well as application thereof
  • Catalyst for normal paraffin hydroisomerization reaction and preparation method as well as application thereof
  • Catalyst for normal paraffin hydroisomerization reaction and preparation method as well as application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Mix the ZSM-12 zeolite molecular sieve containing the template agent and the sodium hydroxide solution with a concentration of 0.2M in the ratio of zeolite molecular sieve (g): sodium hydroxide solution (g) = 1:30 in Comparative Example 1, and place in a water bath at 65°C Stir in medium temperature for 30min, filter the mixture with suction, wash the solid with deionized water until the filtrate is neutral, dry the filter cake at 110°C for 8h, and then roast the sample at 550°C in air atmosphere for 2h to obtain the modified ZSM-12 zeolite molecular sieve.

[0054] Mix the modified ZSM-12 zeolite molecular sieve obtained above with a concentration of 1.0M ammonium nitrate solution according to the ratio of zeolite molecular sieve (gram): ammonium nitrate solution (gram) = 1:20, stir in a water bath at 80°C for ionization After 2 hours of exchange, the mixture was filtered with suction to separate the sample, and the exchange was repeated three times. The filter cake w...

Embodiment 2

[0059] Carry out stability investigation experiment to catalyst of the present invention, reaction condition is identical with embodiment 1, and the relational curve of reactant conversion rate changing with time is shown in Figure 9 . Depend on Figure 9 It can be seen that the catalyst has excellent stability, and there is no sign of deactivation when used for 1200 min.

[0060] Table 1

[0061]

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PUM

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Abstract

The invention relates to a catalyst for a normal paraffin hydroisomerization reaction and a preparation method as well as an application thereof. The catalyst has the characteristics that the activity is high in an n-hexane hydroisomerization reaction, and the selectivity and stability are good for a double-branched-chain product. The catalyst comprises modified zeolite molecular sieve ZSM-12 treated by alkaline solution and noble metal of family VIII, wherein the zeolite molecular sieve ZSM-12 adopts zeolite molecular sieve ZSM-12 containing organic amine template. The preparation method of the catalyst comprises the following steps of: desilication of zeolite molecular sieve ZSM-12 containing template after being treated with alkaline solution to obtain zeolite molecular sieve ZSM-12 with high content of mesoporous, and preparing isomerized catalyst by loading Pt. The catalyst is applied in the normal paraffin hydroisomerization reaction, when the catalyst is applied, the n-hexane hydroisomerization reaction is carried out on a fixed bed miniature reactor, the reacting raw material n-hexane is fed into the reactor by a force pump, and is contacted with the catalyst to react in the reactor after being mixed with hydrogen in a mixer.

Description

technical field [0001] The invention relates to a catalyst for the hydroisomerization reaction of normal alkanes, a preparation method and application thereof. Background technique [0002] C 4 ~C 7 The gasoline blending component produced by the linear paraffin isomerization process does not contain sulfur, olefins, and aromatics, and is the cleanest high-octane gasoline blending component, so this process is an important technology for producing high-octane gasoline. The catalysts commonly used in the isomerization process of linear alkanes are metal / acid bifunctional catalysts, which can be divided into low-temperature type and medium-temperature type according to the operating temperature, and the low-temperature type catalyst is mainly Pt / Cl-Al 2 o 3 Type, medium temperature catalyst is mainly Pt / zeolite molecular sieve type. The former has higher activity and requires a lower reaction temperature, but because it has extremely strict requirements on the content of i...

Claims

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Application Information

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IPC IPC(8): B01J29/74C07C9/16C07C5/27
Inventor 朱伟东郭玉萍卢信清肖强钟依均
Owner ZHEJIANG NORMAL UNIVERSITY
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