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High silicon-aluminum ratio ZSM-5 zeolite catalyst, preparation method and application thereof

A zeolite catalyst, high silicon-aluminum ratio technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of reducing catalyst activity, shortening single-pass reaction life, and low framework silicon-alumina

Inactive Publication Date: 2008-09-24
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ZSM-5 zeolite usually available on the market has a low silica-alumina framework and a large number of acid centers in the catalytic reaction, which can easily lead to coking in the molecular pores of the reactants or products, thereby reducing the activity of the catalyst and shortening its single-pass reaction life.

Method used

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  • High silicon-aluminum ratio ZSM-5 zeolite catalyst, preparation method and application thereof
  • High silicon-aluminum ratio ZSM-5 zeolite catalyst, preparation method and application thereof
  • High silicon-aluminum ratio ZSM-5 zeolite catalyst, preparation method and application thereof

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Embodiment Construction

[0029] Further describe the present invention by embodiment below:

[0030]

[0031]

[0032] Evaluate the activity and the selectivity of ultra-high silica ZSM-5 zeolite catalyst in MTP catalytic reaction with fixed-bed catalytic device, catalyst load is 5mL, raw material is the crude methanol solution of 40~95%, mass space velocity (relative to pure methanol ) is 1~4h -1 , the reaction temperature is 300-520°C. The product was imported into an Agilent 6820 gas chromatograph with an autosampler for online analysis, and the detector was an FID detector.

[0033] The specific examples of MTP catalytic reaction of ultra-high silica ZSM-5 zeolite catalyst are shown in the following table: (1) The concentration of methanol in the reaction solution is 40-95%; (2) The reaction temperature is 150-520°C; (3) The reaction space velocity is 1-4h -1 . The specific implementation examples are as follows:

[0034]

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Abstract

The invention belongs to the catalyst technical field, in particular to a ZSM-5 zeolite catalyst characterized by high ratio of silica and alumina as well as a preparation method and the application thereof. The catalyst, taking a pure silicon compound with activity as a silicon source, is made by a hydrothermal synthesis method by adding trace aluminum. The ratio of silica and alumina in the zeolite catalyst is over 1,000, sub-micron crystal particles with open channels have large surface area and good molecular diffusivity. The catalyst in the reaction of MTP has excellent catalytic activity, high selectivity of propylene, and high ratio of propylene and ethylene. The catalyst has simple regeneration method and good restoration of performance after regeneration.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a ZSM-5 zeolite catalyst with an ultrahigh skeleton silicon-aluminum ratio, a preparation method and application thereof. Background technique [0002] Zeolite molecular sieve is an inorganic aluminosilicate or phosphate crystal, the skeleton contains regular and orderly arranged molecular-sized pores (ca. It is widely used in industrial processes such as catalysis, adsorption separation and ion exchange. [0003] A ZSM-5 zeolite (MFI type) molecular sieve developed by Mobil in 1972 [U.S. Patent 3702886, 1972] has a two-dimensional ten-membered ring channel (a ten-membered ring straight channel with an aperture of 0.54nm×0.56nm and a ten-membered Ring sinusoidal channel, the pore size is 0.51nm×0.54nm), is the most widely used catalytic material so far, it is one of the important active components in petroleum fluidized catalytic cracking (FCC) catalysts, and is us...

Claims

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Application Information

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IPC IPC(8): B01J29/40C07C1/20C07C11/06
CPCY02P20/52Y02P20/584Y02P30/20Y02P30/40
Inventor 龙英才汪靖程晓维郭娟余辉陈筱诚
Owner FUDAN UNIV
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