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Low-cost ZSM-5 molecular sieve preparation method

A technology of ZSM-5 and molecular sieve, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problems of long time consumption, cumbersome operation process and high cost, and achieve short time consumption , Simple operation, cost reduction effect

Inactive Publication Date: 2018-09-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problems of the existing template-free method for preparing ZSM-5 molecular sieves, which are cumbersome, time-consuming and cost-increasing, and provide a low-cost method for preparing ZSM-5 molecular sieves.

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  • Low-cost ZSM-5 molecular sieve preparation method
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  • Low-cost ZSM-5 molecular sieve preparation method

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specific Embodiment approach 1

[0017] Specific embodiment one: the preparation method of the low-cost ZSM-5 molecular sieve of the present embodiment is carried out according to the following steps:

[0018] 1. Weigh polyvinylpyrrolidone (PVP), water, solid alkali, aluminum source, silicon source and silicon source; first mix polyvinylpyrrolidone, water, solid alkali and aluminum source evenly, stir for 5 minutes to obtain solution A, and then pour into the solution Add silicon source dropwise to A. After the dropwise addition, pour it into an open container and record the volume V of the liquid in the open container. 1 , and then stirred at a temperature of 70-90°C for a stirring time T 1 =4~7 hours, obtain solution B;

[0019] 2. Add water to solution B, continue to stir at 70-90°C, stirring time T 2 =8-T 1 hour, get the precursor solution, record the volume V of the precursor solution 2 ; The amount of water added should ensure the volume V of the precursor solution 2 =(0.9~1)V 1 ;

[0020] 3. Tra...

specific Embodiment approach 2

[0022] Embodiment 2: This embodiment is different from Embodiment 1 in that the inorganic base is sodium hydroxide, ammonia water or potassium hydroxide; the others are the same as Embodiment 1.

specific Embodiment approach 3

[0023] Specific embodiment three: this embodiment is different from specific embodiment one or two in that the aluminum source is one or more combinations of aluminum nitrate, sodium metaaluminate and aluminum sulfate; others are the same as specific embodiment one or two .

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Abstract

A low-cost ZSM-5 molecular sieve preparation method. The invention relates to a preparation method of the ZSM-5 molecular sieve and solves technical problems that a template-free preparation method ofthe ZSM-5 molecular sieve has complex steps and consumes long time, which increase cost. The method includes steps of: uniformly mixing polyvinylpyrrolidone, water, solid alkali and an aluminum source, dropwisely adding a silicon source, and pouring the mixture into an opened container with stirring; during the stirring, supplying water to obtain a precursor solution; crystallizing the precursorsolution, and washing and drying the crystal to obtain a powder; finally roasting the powder to obtain the ZSM-5 molecular sieve. The ZSM-5 molecular sieve has an appearance of regular hexagonal prisms and has pores being 0.47-0.65 nm in diameter. The molecular sieve can be used for catalysis.

Description

technical field [0001] The invention relates to a preparation method of ZSM-5 molecular sieve, belonging to the technical field of molecular sieve synthesis. Background technique [0002] ZSM-5 molecular sieve has been widely used in the field of catalysis, such as alkylation, isomerization, disproportionation, catalytic cracking, dewaxing and methanol to gasoline because of its high silicon-aluminum ratio, adjustable acidity and good thermal stability. in the reaction with alkenes. At present, ZSM-5 molecular sieves are mainly synthesized by template method. Generally refers to the use of organic amines, ammonia water, and alcohols as templates for synthesis. Because the templates used account for too much product cost and are expensive, and most of them have certain toxicity, they will cause harm to the operator's body. And cause pollution to the environment, so it is very meaningful to find a preparation method that can replace the above-mentioned template agent. [00...

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Application Information

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IPC IPC(8): C01B39/40
CPCC01B39/40C01P2002/72C01P2004/03
Inventor 杨春晖牛晓冉雷作涛李季
Owner HARBIN INST OF TECH