Preparation method of snowflake-shaped H-ZSM-5 molecular sieve

A technology of ZSM-5 and molecular sieve, which is applied in the field of preparation of molecular sieve catalysts, can solve the problems of short supply and low efficiency of propylene, and achieve the effects of long service life, high production efficiency and simple process

Pending Publication Date: 2019-08-23
HENAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Propylene can be used to produce important chemical products such as polypropylene, propylene oxide, acetone, isopropanol, phenol, glycerin, etc. It is an indispensable chemical production raw material for the development of modern society and economy. Therefore, there is a need to develop efficient methods for the production of propylene

Method used

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  • Preparation method of snowflake-shaped H-ZSM-5 molecular sieve
  • Preparation method of snowflake-shaped H-ZSM-5 molecular sieve
  • Preparation method of snowflake-shaped H-ZSM-5 molecular sieve

Examples

Experimental program
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Embodiment 1

[0019] Add 19g of silica sol to 90g of aqueous solution, continue to add 0.85g of aluminum sulfate, 5.7g of 1,6-hexamethylenediamine and 1.8g of potassium hydroxide, stir and mix evenly to form a colloidal mixture, then dynamically crystallize the colloidal mixture for 48 hours, and filter with suction , washed with water, dried, and roasted to obtain snowflake-like ZSM-5 molecular sieve;

[0020] Add 3g of snowflake-like ZSM-5 molecular sieve into 300mL of 0.5mol / L ammonium nitrate aqueous solution, stir for 8h, suction filter, wash, dry, and roast to obtain the target product snowflake-like H-ZSM-5 molecular sieve.

[0021] The snowflake-shaped H-ZSM-5 molecular sieve prepared in Example 1 is used as a catalyst for the reaction of methanol to produce propylene, wherein the conversion rate of methanol reaches 99.76%, the selectivity of propylene reaches 39.23%, and the yield of propylene reaches 39.13%. And there was no deactivation of the catalyst within 11 hours.

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Abstract

The invention discloses a preparation method of a snowflake-shaped H-ZSM-5 molecular sieve. The method comprises the steps: adding a silicon source in an aqueous solution, adding an aluminum source, atemplate and an alkali source continuously, performing even stirring and mixing so as to form a mixture colloid, then performing crystallization on the mixture colloid for 48 hours, performing suction filtration, water washing and drying, performing roasting so as to obtain a snowflake-shaped ZSM-5 molecular sieve, adding the snowflake-shaped ZSM-5 molecular sieve at a solid-liquid ratio of 1 g:100 mL to an 0.5 mol/L ammonium nitrate aqueous solution, performing stirring for 8 h, performing suction filtration, water washing and drying, and conducting roasting so as to prepare the target product snowflake-shaped H-ZSM-5 molecular sieve. The prepared snowflake-shaped H-ZSM-5 molecular sieve has the advantages of a unique pore structure, suitable acidity, good stability, a large specific surface area and the like, and has good catalytic performance for methanol catalysis in a propylene preparation reaction and a long service life.

Description

technical field [0001] The invention belongs to the technical field of preparation of molecular sieve catalysts for catalyzing methanol to prepare propylene, and in particular relates to a preparation method of snowflake-shaped H-ZSM-5 molecular sieves. Background technique [0002] Propylene can be used to produce important chemical products such as polypropylene, propylene oxide, acetone, isopropanol, phenol, glycerin, etc. It is an indispensable chemical production raw material for the development of modern society and economy. Therefore, there is a need to develop an efficient method for producing propylene. [0003] At present, the production route of methanol to propylene (MTO) is mature, and H-ZSM-5 molecular sieve is considered to be a better catalyst for methanol to propylene. Conventional H-ZSM-5 molecular sieves, such as ellipsoidal H-ZSM-5 molecular sieves and boat-shaped H-ZSM-5 molecular sieves, can catalyze methanol to produce propylene. The conversion rate o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/40B01J29/40C07C11/06C07C1/20
CPCB01J29/40C01B39/40C01P2004/03C07C1/20C07C2529/40C07C11/06Y02P20/52
Inventor 徐霆岑诗雨杜立方
Owner HENAN NORMAL UNIV
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