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Catalyst for C4 liquefied petroleum gas aromatization and its preparing method

A liquefied petroleum gas and catalyst technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problem of fast coking and deactivation of catalysts, reducing the effective size of zeolite micropores, and increasing the diffusion resistance of micropores and other problems, to achieve the effect of strong anti-coke deactivation ability, low cost, and few modification steps

Inactive Publication Date: 2005-03-02
DALIAN LIGONG QIWANGDA CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, although the aromatization catalyst prepared by the existing method has good aromatization catalytic performance, the coking deactivation speed of the catalyst is fast, the single-pass operation period is short, and the use temperature must generally be higher than 500 ° C.
[0015] After analysis, the inventor believes that the problem of the existing preparation method of aromatization catalyst is that it reduces the ratio of strong acid centers on the catalyst and increases the ratio of Lewis acid centers to protonic acid centers on the catalyst, and reduces the density of zeolite micropores. effective size, the result is a corresponding increase in the diffusion resistance in the micropores

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0033] Catalyst Preparation Example 1: A hydrogen-type zeolite catalyst was prepared by using sodium-type ZSM-5 zeolite with a grain size of 20-50 nanometers.

[0034](1) Removal of organic amine template agent treatment: get the sodium ZSM-5 zeolite powder (SiO 2 / Al 2 o 3 The molar ratio is 26), dried at 110°C for 3 hours, and then carried out temperature-programmed roasting in a muffle furnace. The heating method is as follows: from room temperature to 300°C at a heating rate of 1°C / min, and at a constant temperature of 300°C for 1 hour Then raise the temperature to 400°C at the same heating rate, and keep the temperature at 400°C for 1 hour; then raise the temperature to 500°C at the same heating rate, and keep the temperature at 500°C for 1 hour; then raise the temperature to 550°C at the same heating rate, Constant temperature at 550°C for 12 hours.

[0035] (2) Molding: According to the weight ratio of zeolite and alumina on a dry basis of 8:2, take 80 grams (dry bas...

preparation Embodiment 2

[0037] Catalyst Preparation Example 2: A hydrogen-type zeolite catalyst with low molecular sieve content was prepared by using sodium-type ZSM-5 zeolite with a grain size of 20-50 nanometers.

[0038] Repeat embodiment 1, but used 20-50 nanometer ZSM-5 zeolite (SiO 2 / Al 2 o 3 The molar ratio of 26) to the dry basis weight ratio of alumina is 50:50. Accordingly, the obtained hydrogen-form catalyst was designated as HZSM-5(B).

preparation Embodiment 3

[0039] Catalyst Preparation Example 3: A hydrogen-type zeolite catalyst was prepared by using sodium-type ZSM-5 zeolite with a grain size of 300-500 nm.

[0040] Repeat embodiment 1, but used sodium type ZSM-5 zeolite former powder grain size is 300-500 nanometer (SiO 2 / Al 2 o 3 Molar ratio 26). Accordingly, the obtained hydrogen-form catalyst was designated as HZSM-5(C).

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Abstract

The present invention belongs to the field of catalyst preparation in petrochemical technology, and especially one kind of catalyst for the aromatization of liquefied C4 petroleum gas in fixed bed reactor and its preparation process. Technologically, the catalyst features that its mother substance is high-silicon zeolite with crystal granulation of 10-500 nm and the zeolite is alumina formed and prepared into the hydrogen type catalyst via conventional process, and the hydrogen type catalyst is vapor treated to regulate the acidity and acid treated to expand the pores and restore the pore passage. The catalyst is used in the aromatization of liquefied C4 petroleum gas, and has low reaction temperature, high olefin converting rate and high carbon deposition resistance.

Description

technical field [0001] The invention belongs to the technical field of petrochemical catalyst preparation. It relates to a catalyst suitable for the aromatization of C4 liquefied petroleum gas in a fixed-bed reactor and a preparation method thereof. Background technique [0002] A large amount of C4 liquefied petroleum gas is produced by steam cracking units and various catalytic cracking units in refineries. C4 liquefied petroleum gas contains a large amount of various butenes, and converting butenes into fuel gasoline is a very meaningful way of resource utilization. [0003] Patent literature US3960978 (1976) discloses a kind of can light olefin (C 2 ~C 5 ) is a catalyst for conversion to olefinic gasoline through oligomerization or superposition, and the catalyst belongs to ZSM-5 / ZSM-11 modified with Ni, Zn or Cr metal ions. After this patent, many patents at home and abroad related to oligomerization or superposition catalysts of low-carbon olefins. The conversion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C10G50/00
Inventor 郭洪臣赵凌雁叶娜左广玲孙琳苏际陈黎行王祥生
Owner DALIAN LIGONG QIWANGDA CHEM TECH
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