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Metal modification ZSM-5 molecular sieve based catalyst and preparation method and application

A ZSM-5, metal modification technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of large acidity drop of molecular sieves, blockage of molecular sieve channels, high reaction temperature, etc., and achieve the modification effect Good, reduce energy consumption, improve the effect of selectivity

Active Publication Date: 2016-11-23
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent proposes a better modification idea, but the reaction temperature is high, the pressure is high, and the rare earth salt solution is thicker, and there may be excessive rare earth element ions, resulting in blockage of molecular sieve channels and excessive drop in acidity of the modified molecular sieve. Not conducive to its application in the reaction

Method used

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  • Metal modification ZSM-5 molecular sieve based catalyst and preparation method and application
  • Metal modification ZSM-5 molecular sieve based catalyst and preparation method and application
  • Metal modification ZSM-5 molecular sieve based catalyst and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Dissolve 30g of lanthanum nitrate into 400ml of water to prepare a solution, slowly add the solution dropwise to 200g of HZSM-5 with a silicon-aluminum ratio of 28, stir thoroughly for 2 hours, transfer the solid-liquid mixture to a high-temperature reaction kettle, and heat it at 140°C After reacting for 12 hours, the reaction kettle was taken out, cooled to room temperature in the air, the lid of the reaction kettle was opened, and dried at 100°C for 10 hours to obtain catalyst powder. The catalyst was pressed into tablets at 20 MPa, and 40-80 mesh particles were sieved to obtain a catalyst for evaluation. The XRD pattern of the product is as follows figure 2 As shown, the electron microscope photos of the product are as follows image 3 shown.

Embodiment 2

[0054] Dissolve 30g of cerium chloride into 400ml of water and oxalic acid mixture (water: oxalic acid = 4:1) to prepare a solution, slowly add this solution dropwise to 200g of HZSM-5 with a silicon-aluminum ratio of 38, fully After stirring for 2 hours, the solid-liquid mixture was transferred to a high-temperature reactor, and reacted at 140°C for 14 hours, then the reactor was taken out, cooled to room temperature in air, the lid of the reactor was opened, and dried at 100°C for 10 hours to obtain catalyst powder. The catalyst was pressed into tablets at 20 MPa, and 40-80 mesh particles were sieved to obtain a catalyst for evaluation.

Embodiment 3

[0056] Dissolve 25g of cerium nitrate into 400ml of water and citric acid mixture (water: citric acid mass ratio is 10:1) to prepare a solution, slowly add the solution dropwise to 200g of HZSM-5 with a silicon-aluminum ratio of 180, and stir thoroughly After 2 hours, the solid-liquid mixture was transferred to a high-temperature reactor, reacted at 180°C for 12 hours, and then the reactor was taken out, cooled to room temperature in air, the lid of the reactor was opened, and dried at 100°C for 10 hours to obtain catalyst powder. The catalyst was pressed into tablets at 20 MPa, and 40-80 mesh particles were sieved to obtain a catalyst for evaluation.

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Abstract

The invention provides a metal modification ZSM-5 molecular sieve based catalyst. The catalyst is characterized in that the catalyst is prepared by modifying and preparing a ZSM-5 molecular sieve through a hydrothermal method by means of modification elements, wherein the modification elements are La and / or Ce; the total mass of ZSM-5 in ZSM-5 molecular sieve based catalyst is 100%, and the mass content of modified elements is 0.01-15%; preferentially, the metal modification ZSM-5 molecular sieve is used for light dydrocarbon catalytic cracking to prepare low carbon olefin, and light hydrocarbon is alkane or olefin simple substance or a mixture with the carbon number being 4-8. The metal modification ZSM-5 molecular sieve based catalyst is easy and convenient to operate and free of high-temperature operation, lowers energy consumption and improves modified element utilization rate, the modification effect is better than a traditional mode, the addition amount of modification elements is reduced, the selectivity of catalyst for low-carbon olefin is improved, the reaction service life is enhanced greatly in the long-period reaction, and the better application value is achieved.

Description

technical field [0001] The invention relates to the field of catalysts, specifically to the field of catalysts for preparing olefins by cracking hydrocarbons, and more specifically to a metal-modified ZSM-5 molecular sieve catalyst and its preparation method and application. Background technique [0002] Ethylene and propylene are important chemical raw materials. For nearly half a century, the main source of ethylene is steam cracking, and the main source of propylene is the by-product of naphtha steam cracking and fluid catalytic cracking (FCC) process. Steam cracking is a process of steam thermal cracking of naphtha at a high temperature above 850°C. On the one hand, the energy consumption of the process is the largest in the petrochemical industry. Although the continuous optimization of the steam cracking process has not started Solving the problem at the source caused the energy consumption and carbon emissions of the process to remain high. In addition, the steam cr...

Claims

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Application Information

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IPC IPC(8): B01J29/40C07C11/04C07C11/06C07C4/06
Inventor 巩雁军张络明马通王洪华李冰李国栋
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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