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

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

Example Embodiment

[0045] Example 1

[0046] This embodiment provides a multi-level hole ZSM-5 / SiO based on small crystal grain ZSM-5 2 The composite catalyst 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 an hour, and then add 20.03g of TEOS after half an hour, and then stir the four substances together for 12 hours to obtain a mixed solution;

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

[0049] Then press 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 PTFE hydrothermal synthesis kettle, and crystallize at 90℃ 72h;

[0050] After the crystallization is completed, the synthesized solution is f...

Example Embodiment

[0054] Example 2

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

[0056] The multi-porous ZSM-5 / SiO prepared in this example 2 The XRD pattern and SEM pattern of the composite catalyst are as follows: Figure 2a with Figure 2b Shown.

[0057] Table 2 Yield distribution of main products of cracking reaction

[0058]

Example Embodiment

[0059] Example 3

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

[0061] The multi-porous ZSM-5 / SiO prepared in this example 2 The XRD pattern and SEM pattern of the composite catalyst are as follows: Figure 3a with Figure 3b Shown.

[0062] Table 3 Yield distribution of main products of cracking reaction

[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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