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Method for synthesizing hierarchical pore ZSM-22 molecular sieve by adopting single template method

A multi-level pore, molecular sieve technology, applied in molecular sieve catalysts, molecular sieves and alkali exchange compounds, chemical instruments and methods, etc., can solve the problems of long one-dimensional micropore channels and large amount of organic template agent, and shorten the micropore channel. , the effect of improving the yield and shortening the diffusion distance of micropores

Active Publication Date: 2022-03-25
HEILONGJIANG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for synthesizing multi-level porous ZSM-22 molecular sieves by single-template method in order to solve the problem that the existing microporous ZSM-22 molecular sieve has a large amount of organic templates and long one-dimensional micropore channels

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  • Method for synthesizing hierarchical pore ZSM-22 molecular sieve by adopting single template method
  • Method for synthesizing hierarchical pore ZSM-22 molecular sieve by adopting single template method
  • Method for synthesizing hierarchical pore ZSM-22 molecular sieve by adopting single template method

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specific Embodiment approach 1

[0030] Specific implementation mode one: the method for synthesizing the multi-level porous ZSM-22 molecular sieve by the single template method in this embodiment is realized according to the following steps:

[0031] 1. According to the molar ratio of 1: (0.005 ~ 0.02): (0.1 ~ 0.5): (0.002 ~ 0.01): (10 ~ 50) silicon source, aluminum source, alkali source, PHMB templating agent (polyhexamethylene Biguanide) and water are fully mixed to obtain the initial gel mixture;

[0032] 2. Crystallization: The initial gel mixture is placed in a closed stainless steel reaction kettle with a polytetrafluoroethylene liner, and the crystallization reaction is carried out at a crystallization temperature of 140-190°C for 1-3 days, and then cooled to room temperature, and then successively undergo centrifugation, washing and drying, put it into a muffle furnace, and roast it at a temperature of 500-600°C to obtain a multi-stage porous ZSM-22 molecular sieve.

[0033] Step 1 of this embodimen...

specific Embodiment approach 2

[0036] Embodiment 2: This embodiment differs from Embodiment 1 in that the silicon source described in step 1 is silica sol.

specific Embodiment approach 3

[0037] Embodiment 3: This embodiment is different from Embodiment 2 in that the mass fraction of the silica sol is 20.0-40.0%.

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Abstract

The invention relates to a method for synthesizing a hierarchical pore ZSM-22 molecular sieve by adopting a single template method, and aims to solve the problems that an existing microporous ZSM-22 molecular sieve is large in organic template agent consumption and long in one-dimensional micropore pore channel. The synthesis method comprises the following steps: 1, uniformly mixing a silicon source, an aluminum source, an alkali source, a polyhexamethylene biguanide template agent and water to obtain an initial gel mixture; and 2, carrying out hydrothermal crystallization reaction at the crystallization temperature of 140-190 DEG C for 1-3 days, then sequentially carrying out centrifugal separation, washing and drying treatment, then putting into a muffle furnace, and carrying out roasting treatment at the temperature of 500-600 DEG C to obtain the hierarchical pore ZSM-22 molecular sieve. When the hierarchical pore ZSM-22 molecular sieve is synthesized, only PHMB is used as a single template agent, and the use amount of the template agent is only 1 / 5-1 / 10 of that of a traditional method, so that the pore channels of micropores are greatly shortened, the acid strength is obviously weakened, the accessibility of active sites of the catalyst is improved, and the cracking reaction of isomerization products is effectively inhibited.

Description

technical field [0001] The invention relates to a method for synthesizing a multi-level hole ZSM-22 molecular sieve by using a single template agent. Background technique [0002] As a microporous crystal material with regular pore structure, large specific surface area, strong acidity and high stability, zeolite molecular sieve is one of the most important shape-selective catalysts and carriers in modern petrochemical industry. , is widely used in industrial production processes such as catalysis, adsorption and ion exchange. Among them, ZSM-22 molecular sieve is a microporous zeolite molecular sieve with one-dimensional linear non-intersecting straight channels with ten-membered ring openings developed by Mobil Corporation of the United States in the 1980s. The pore size is 0.45nm×0.55nm and belongs to the TON topology. . Due to the appropriate pore structure, pore size and acidity, the Pt / ZSM-22 bifunctional catalyst prepared with ZSM-22 molecular sieve as a carrier sho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/48C01B39/04B01J29/70C07C5/27C07C9/16
CPCC01B39/48C01B39/04B01J29/7042C07C5/2775C01P2002/72C01P2004/03C01P2006/17C07C9/16Y02P20/52
Inventor 王巍吴伟李彤白雪峰孙嘉政
Owner HEILONGJIANG UNIV
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