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Multistage hole ZSM-5/SiO2 catalyst, preparation method catalyst, and n-octane catalytic cracking method

A ZSM-5, catalytic cracking technology, applied in the petrochemical field, can solve the problem of high temperature in the cracking reaction of the tube furnace, and achieve the effect of excellent reaction performance and improved mechanical strength

Active Publication Date: 2013-12-18
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cracking reaction temperature of the conventional tube furnace is high, making the ethylene production device the largest energy-consuming device in the petrochemical industry, and its energy consumption accounts for 40% of the entire petrochemical industry.

Method used

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  • Multistage hole ZSM-5/SiO2 catalyst, preparation method catalyst, and n-octane catalytic cracking method
  • Multistage hole ZSM-5/SiO2 catalyst, preparation method catalyst, and n-octane catalytic cracking method
  • Multistage hole ZSM-5/SiO2 catalyst, preparation method catalyst, and n-octane catalytic cracking method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment provides a kind of hierarchical hole ZSM-5 / SiO based on small grain ZSM-5 2 Composite catalyst, it is prepared by the following steps:

[0047] At room temperature, weigh 27.38g of TPAOH and 19.82g of water, mix and stir, then add 0.38g of aluminum isopropoxide every half hour, then add 20.03g of TEOS after half an hour, and then stir the four substances together for 12h to obtain a mixed solution;

[0048] The mixed solution was subjected to open-open alcohol distillation treatment at 50°C for 6 hours, and the water lost due to evaporation was replenished during the alcohol distillation process;

[0049] Then by macroporous-mesoporous SiO 2 Carrier: silica sol=0.065:1 mass ratio Put the carrier into the mixed solution for 30 minutes, then pour the mixed solution and the substrate into the cleaned polytetrafluoroethylene hydrothermal synthesis kettle, and crystallize at 90°C 72h;

[0050] After the crystallization is completed, the synthesized solutio...

Embodiment 2

[0055] The sample crystallization time in Example 1 was changed to 96h, and other conditions were the same as in Example 1. The reaction results and yields of main products obtained are shown in Table 2.

[0056] The hierarchical porous ZSM-5 / SiO prepared in this example 2 The XRD patterns and SEM patterns of the composite catalyst are as follows Figure 2a and Figure 2b shown.

[0057] Table 2 Cracking reaction main product yield distribution

[0058]

Embodiment 3

[0060] The crystallization time of the sample in Example 1 was changed to 120 h, and other conditions were the same as in Example 1. The reaction results and yields of main products obtained are shown in Table 3.

[0061] The hierarchical porous ZSM-5 / SiO prepared in this example 2 The XRD patterns and SEM patterns of the composite catalyst are as follows Figure 3a and Figure 3b shown.

[0062] Table 3 Cracking reaction main product yield distribution

[0063]

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Abstract

The invention provides a multistage hole ZSM-5 / SiO2 catalyst, a preparation method of the catalyst, and an n-octane catalytic cracking method. The preparation method of the catalyst comprises the following steps: stirring and mixing 15-35 parts by weight of TPAOH (Tetrapropylammonium Hydroxide) and 10-25 parts by weight of water, sequentially adding 0.1-0.6 part by weight of aluminium isopropoxide and 15-30 parts by weight of TEOS (Tetraethyl Orthosilicate) every half hour, and then stirring and mixing for 6-24 hours to obtain a mixed solution; heating the mixed solution to 40-60 DEG C for carrying out alcohol evaporating treatment for 4-8 hours, and supplementing water lost due to evaporation in the alcohol evaporating process; after the alcohol evaporating treatment is completed, adding a macroporous-mesoporous SiO2 carrier, stirring for 30-60 minutes, and then carrying out crystallization treatment at 80-140 DEG C for 48-84 hours; centrifugalizing, cleaning and drying products which are subjected to the crystallization treatment, and then calcining at 500-550 DEG C to obtain the multistage hole ZSM-5 / SiO2 composite catalyst. The invention also provides the multistage hole ZSM-5 / SiO2 catalyst prepared through using the mehtod. The invention also provides the n-octane catalytic cracking method by adopting the multistage hole ZSM-5 / SiO2 catalyst.

Description

technical field [0001] The invention relates to a kind of hierarchical hole ZSM-5 / SiO 2 The catalyst, its preparation method and n-octane catalytic cracking method belong to the technical field of petrochemical industry. Background technique [0002] Ethylene and propylene are two important basic chemical raw materials, which play a pivotal role in the development of the national economy. In recent years, due to the continuous increase of market demand, the existing production process conditions are increasingly unable to meet the market demand. At present, the production method of low-carbon olefins such as ethylene and propylene is mainly steam cracking. However, the high cracking reaction temperature of the conventional tube furnace makes the ethylene production unit the largest energy-consuming device in the petrochemical industry, and its energy consumption accounts for 40% of the entire petrochemical industry. Compared with steam thermal cracking, catalytic cracking...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J35/10C07C11/04C07C11/06C07C4/06
CPCY02P20/52
Inventor 赵震姜桂元李祥虎刘佳徐春明段爱军刘坚韦岳长高金森
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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