A kind of boron-containing zsm-5 zeolite catalyst for producing olefin from methanol and preparation method thereof

A zeolite catalyst, ZSM-5 technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low reaction conversion rate and weak acidity, and achieve high reaction space velocity and high crystallinity. , the effect of excellent catalytic activity

Inactive Publication Date: 2011-11-30
FUDAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, B-ZSM-5 molecular sieve is used in the reaction of methanol to olefins, because its acidity is too weak, resulting in a very low conversion rate (<1%)

Method used

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  • A kind of boron-containing zsm-5 zeolite catalyst for producing olefin from methanol and preparation method thereof
  • A kind of boron-containing zsm-5 zeolite catalyst for producing olefin from methanol and preparation method thereof
  • A kind of boron-containing zsm-5 zeolite catalyst for producing olefin from methanol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The preparation process and steps of this embodiment are as follows:

[0048] a. Preparation of the reaction mixture

[0049] Take the following materials: the silicon source is silica sol, the aluminum source is aluminum isopropoxide, the boron source is boric acid, the template agent is ethylenediamine and deionized water; each material is weighed by molar ratio, namely SiO 2 :Al 2 o 3 :B 2 o 3 : Templating agent: H 2 O = 1: 0.005: 0.05: 1.0: 10, to prepare a mixture solution; the process of preparing a mixture solution is: first mix the aluminum source, boron source and deionized water evenly, add the template agent under constant stirring, and wait to stir to form After clarifying the transparent liquid, continue to stir and slowly add the silicon source. After stirring evenly again, slowly add sulfuric acid to adjust the pH of the solution to neutral, and then add ammonia water to adjust the pH of the solution to 8~10. After further stirring (4~12h), a reacti...

Embodiment 2

[0055] In the preparation process of the catalyst in this example, water glass was used as the silicon source, aluminum sulfate was used as the aluminum source, and sodium tetraborate was used as the boron source. The synthesis steps are exactly the same as in Example 1, and the catalyst obtained is marked as HBZ5-2.

Embodiment 3

[0057] The steps in this embodiment are exactly the same as those in Embodiment 1 above. The difference is: in the preparation process of the reaction mixture, the silicon source adopts ethyl orthosilicate, the boron source adopts boron trichloride, and the template agent adopts tetrapropylammonium hydroxide; and the molar ratio of each substance is: SiO 2 :Al 2 o 3 :B 2 o 3 : Templating agent: H 2 O = 1:0.004:0.02:0.6:20; hydrothermal crystallization at 170°C for three days was used in the hydrothermal crystallization process; Molecular sieve (B-Al-ZSM-5) raw powder was subjected to ion exchange for three consecutive times, each time for 5 hours. Wherein the solution volume / product mass=10ml / g, and the ion exchange temperature is 85°C. The resulting catalyst was labeled HBZ5-3.

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Abstract

The invention belongs to the technical field of chemical catalysts, in particular to a boron-containing zeolite catalyst for preparing olefins from methanol, and a preparation method and application thereof. In the invention, the silicon source, the aluminum source, the boron source and the template are mixed with deionized water and subjected to hydrothermal treatment to synthesize a ZSM-5 zeolite catalyst containing both boron and aluminum and silicon in the framework in one step. The synthesized zeolite has a high crystallinity and a typical MFI structure, and the medium acid strength and the ratio of strong acid sites on the surface of the molecular sieve can be effectively controlled. The zeolite catalyst exhibits excellent catalytic activity and stability in the catalytic reaction of methanol to olefins.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysts, and in particular relates to a boron-containing ZSM-5 zeolite catalyst and its preparation method and application, in particular to the application of the catalyst in the reaction of methanol to olefins. Background technique [0002] ZSM-5 zeolite molecular sieve was developed by Mobil in 1972 [USP 3702886], which has a two-dimensional ten-membered ring channel (a ten-membered ring straight channel with a pore size of 0.54nm x 0.56nm, and a ten-membered ring sinusoidal channel of 0.51nm x 0.54nm). Due to its unique pore structure and acidic properties, it has become one of the most widely used catalytic materials so far, mainly used in the fluid catalytic cracking (FCC) process of long-chain hydrocarbons. ZSM-5 zeolite catalyst has achieved good results in increasing the production of low-carbon olefins, especially propylene, and has become one of the important active components. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C1/20C07C11/06C07C11/04C07C11/02
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 徐华龙杨依苏沈伟杜俊明乐英红华伟明魏建华张春雷宁春利曾义红
Owner FUDAN UNIV
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