Method for synthesizing MCM-56 molecular sieve by HMI (hexamethylene imine)/PI (piperidine) composite template

A MCM-56, composite template technology, applied in molecular sieves and alkali exchange compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of not being used alone, and achieve the effect of low cost, mild conditions and stable crystal phase

Active Publication Date: 2018-11-23
合肥龙智机电科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the templates for synthesizing MCM-56 molecular sieve mainly include hexamethyleneimine (HMI), piperidine (PI), aniline (AN), etc., but piperidine and aniline cannot be used alone, and aniline must be combined with hexamethylene MCM-56 molecular sieve can be synthesized only when imine is used simultaneously, while piperidine must be used together with MCM-56 molecular sieve seed crystal to synthesize MCM-56 molecular sieve, while hexamethyleneimine (HMI) and piperidine ( PI) has not been reported so far as a composite template for the synthesis of MCM-56 molecular sieves

Method used

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  • Method for synthesizing MCM-56 molecular sieve by HMI (hexamethylene imine)/PI (piperidine) composite template
  • Method for synthesizing MCM-56 molecular sieve by HMI (hexamethylene imine)/PI (piperidine) composite template
  • Method for synthesizing MCM-56 molecular sieve by HMI (hexamethylene imine)/PI (piperidine) composite template

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Experimental program
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Embodiment 1

[0031] The method for the synthesis of MCM-56 molecular sieves provided by a kind of HMI / PI composite template provided by the present embodiment comprises the following steps:

[0032] S1, weigh 12g white carbon black (SiO 2 ), 54g deionized water (H 2 (O), 1.64g sodium metaaluminate (mass content is Al 2 o 3 62%, Na 2 O 38%), 0.72g sodium hydroxide (NaOH), 4.6218g hexamethyleneimine (HMI), 1.9925g piperidine (PI);

[0033] S2, add part of 54g of deionized water to 12g of white carbon black, and keep stirring until the white carbon black becomes colloidal, then add 4.6218g of hexamethyleneimine (HMI) and 1.9925g of piperin at one time while stirring. Pyridine (PI) was made into mixed solution A, and the mouth of the beaker containing mixed solution A was sealed with plastic wrap, and placed on a heat-collecting constant temperature magnetic stirrer at room temperature for 3 hours (the stirrer was Gongyi Yuhua DF -101s model, speed 15);

[0034] S3, use another part of ...

Embodiment 2

[0040] The method for the synthesis of MCM-56 molecular sieves provided by a kind of HMI / PI composite template provided by the present embodiment comprises the following steps:

[0041]S1, weigh 12g white carbon black (SiO 2 ), 54g deionized water (H 2 O), 1.0824g sodium metaaluminate (mass content is Al 2 o 3 62%, Na 2 O 38%), 0.72g sodium hydroxide (NaOH), 4.6218g hexamethyleneimine (HMI), 1.9925g piperidine (PI);

[0042] S2, add part of 54g of deionized water to 12g of white carbon black, and keep stirring until the white carbon black becomes colloidal, then add 4.6218g of hexamethyleneimine (HMI) and 1.9925g of piperin at one time while stirring. Pyridine (PI) was made into mixed solution A, and the mouth of the beaker containing mixed solution A was sealed with plastic wrap, and placed on a heat-collecting constant temperature magnetic stirrer at room temperature for 3 hours (the stirrer was Gongyi Yuhua DF -101s model, speed 15);

[0043] S3, use another part of ...

Embodiment 3

[0049] The method for the synthesis of MCM-56 molecular sieves provided by a kind of HMI / PI composite template provided by the present embodiment comprises the following steps:

[0050] S1, weigh 12g white carbon black (SiO 2 ), 54g deionized water (H 2 O), 1.312g sodium metaaluminate (mass content is Al 2 o 3 62%, Na 2 O 38%), 0.72g sodium hydroxide (NaOH), 4.6218g hexamethyleneimine (HMI), 1.9925g piperidine (PI);

[0051] S2, add part of 54g of deionized water to 12g of white carbon black, and keep stirring until the white carbon black becomes colloidal, then add 4.6218g of hexamethyleneimine (HMI) and 1.9925g of piperin at one time while stirring. Pyridine (PI) was made into mixed solution A, and the mouth of the beaker containing mixed solution A was sealed with plastic wrap, and placed on a heat-collecting constant temperature magnetic stirrer at room temperature for 3 hours (the stirrer was Gongyi Yuhua DF -101s model, speed 15);

[0052] S3, use another part of ...

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Abstract

The invention belongs to the technical field of MCM-56 molecular sieve synthesis, and specifically discloses a method for synthesizing an MCM-56 molecular sieve by HMI (hexamethylene imine)/PI (piperidine) composite templates. According to the invention, HMI and PI are taken as the composite template, solid silica gel is selected as a silicon source, and the MCM-56 molecular sieve is synthesized under dynamic hydrothermal crystallization conditions. The dynamic hydrothermal crystallization method is realized by the manner of heating in an oil bath and magnetically stirring the reaction material. The method is simple in operation, mild in condition, and reduces the synthesis cost of the MCM-56 molecular sieve. The crystal phase of the synthesized MCM-56 molecular sieve is stable, and the synthesized MCM-56 molecular sieve is not subjected to phase transformation to form an MCM-49 molecular sieve with the prolongation of crystallization time, which enriches the species of templates for synthesizing the MCM-56 molecular sieve and provides a new method for synthesizing the MCM-56 molecular sieve.

Description

technical field [0001] The invention relates to the technical field of synthesis of MCM-56 molecular sieves, in particular to a method for synthesizing MCM-56 molecular sieves with an HMI / PI composite template. Background technique [0002] MCM-56 layered zeolite molecular sieve has the same MWW topology as MCM-22, MCM-49, etc. Due to its unique structural characteristics and physical and chemical properties, it shows good catalytic performance in many hydrocarbon conversion reactions The cost of methylimine is relatively high (200 yuan / 100ml, AR), and it is a highly toxic chemical, so researchers have been working on the research of replacing or partially replacing hexamethyleneimine as a template to synthesize molecular sieves with MWW structure. At present, researchers have successfully used cyclohexylamine, cyclopentylamine, cycloheptylamine, and heptamethyleneimine as templates to synthesize molecular sieves with MWW structures, but hexamethyleneimine is still the most ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/48C01B39/04
CPCC01B39/04C01B39/48C01P2002/72
Inventor 林卿郭泽平杨芳许建梅何云
Owner 合肥龙智机电科技有限公司
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