Modified no-adhesive ZSM-5 zeolite catalyst and its prepn process

A zeolite catalyst and binder-free technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of ethylene non-selectivity and non-renewable catalysts, and achieve excellent catalytic activity, ethylene High selectivity and high ethanol conversion

Inactive Publication Date: 2007-06-06
FUDAN UNIV
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  • Abstract
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Problems solved by technology

Diethyl ether, acetaldehyde and acetone are the main by-products in the dehydration process, but the catalyst is not selective to ethylene [JournalOf Molecular Catalysis A-Chemical 2003, 200(1-2),

Method used

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  • Modified no-adhesive ZSM-5 zeolite catalyst and its prepn process
  • Modified no-adhesive ZSM-5 zeolite catalyst and its prepn process
  • Modified no-adhesive ZSM-5 zeolite catalyst and its prepn process

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Embodiment Construction

[0026] Further describe the present invention by embodiment below:

[0027] Different silicon-aluminum ratios (SiO 2 / Al 2 o 3 =20, 40, 80, 160, 300), and the basic binderless ZSM-5 zeolite with diameters of 0.5, 1.0, 1.5, and 2.0 mm respectively was a product of Shanghai Fuxu Molecular Sieve Co., Ltd.

[0028] The hydrothermal treatment conditions of the basic binder-free ZSM-5 zeolite are as follows: the basic zeolite is placed in a saturated water vapor environment, and the space velocity is controlled to be 1, 2, and 3 hours respectively. -1 , the temperatures were 400, 600, and 800°C, and the treatment times were 5, 10, 15, and 20 hours, respectively.

[0029] The zeolite after the hydrothermal treatment is then treated with a hot acid solution. The method is as follows: use hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, acetic acid, citric acid, etc., respectively, with a concentration of 0.5, 1.0, and 2.0 mol / L, at a temperature of 80, 90, 100 ℃ aci...

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Abstract

The present invention belongs to the field of material synthesis technology, and is especially modified no-adhesive ZSM-5 zeolite catalyst and its preparation process and application in catalyzing the dewatering of dilute alcohol solution to prepare ethylene. The catalyst is prepared with no-adhesive ZSM-5 zeolite as basic material and through one modification process combining high temperature water vapor and acid treatment. The catalyst has high content of effective component ZSM-5 zeolite, high molecule diffusion, high crystallization degree, opened channels and great specific surface area. In catalyzing the dewatering of dilute alcohol solution to prepare ethylene, the catalyst has high catalytic activity, low reaction solution ethanol concentration, low reaction temperature, high ethanol converting rate, high ethylene selectivity and high space velocity.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and in particular relates to a modified binderless ZSM-5 zeolite catalyst, a preparation method thereof, and an application in the catalytic reaction of dilute ethanol dehydration to ethylene. Background technique [0002] Zeolite molecular sieve is an inorganic aluminosilicate or phosphate crystal, the skeleton contains regular and orderly arranged pores or cages of molecular size (ca. It is widely used in industrial catalysis, adsorption separation and ion exchange. [0003] ZSM-5 (MFI type) zeolite is a molecular sieve [U.S. Patent 3702886, 1972] developed by Mobil Corporation in 1972. It is the most widely used petrochemical catalyst, and it is one of the main active components in petroleum fluid catalytic cracking (FCC) catalysts, and it is also used in petroleum catalytic cracking in hydrocracking In oil refining processes such as cracking and refining. Zeolite molecular sieve...

Claims

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Application Information

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IPC IPC(8): B01J29/40C07C1/24C07C11/04
CPCY02P20/52
Inventor 龙英才程晓维汪靖
Owner FUDAN UNIV
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