Method for improving Y-shaped molecular sieve water heat stability by employing cage heteroatom

A technology of hydrothermal stability and thermal stability, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low crystallinity and hydrothermal stability, and the reaction process that cannot be applied to catalytic cracking, etc. problems, to achieve the effect of improving skeleton stability, improving thermal stability and hydrothermal stability

Inactive Publication Date: 2008-03-05
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the introduction of heteroatoms into Y molecular sieves is mainly through gas-solid replacement or liquid-solid replacement, that is, various heteroatoms are introduced into the framework of Y molecular sieves in the ultra-stable process ("Secondary Synthesis and Characterization of Heteroatom Zeolites I , II", "Mole...

Method used

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  • Method for improving Y-shaped molecular sieve water heat stability by employing cage heteroatom
  • Method for improving Y-shaped molecular sieve water heat stability by employing cage heteroatom
  • Method for improving Y-shaped molecular sieve water heat stability by employing cage heteroatom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Preparation and ultra-stable treatment of TiY molecular sieve

[0031] Step 1: Preparation of crystallization directing agent

[0032] According to 15Na 2 O: Al 2 o 3 : 2Ti(SO 4 ) 2: 15SiO 2 : 230H 2 The ratio of O is water glass (Beijing Red Star Soda Soda Factory, modulus: 3.1~3.4), NaOH (Beijing Chemical Plant, chemically pure, effective content ≮82%), NaAlO 2 (Beijing Chemical Plant, chemically pure), Ti(SO 4 ) 2 (Beijing Chemical Plant, chemically pure) and H 2 After mixing O evenly, age at 30°C for 3 days to obtain the liquid phase directing agent.

[0033] Step 2: Synthesis of TiY molecular sieve

[0034] According to 3.5Na 2 O: Al 2 o 3 : Ti(SO 4 ) 2 : 9SiO 2 : 320H 2 The raw material ratio of O is water glass (same as above), NaOH (same as above), aluminum sulfate (Beijing chemical plant, chemically pure), Ti (SO 4 ) 2 (Beijing chemical plant, chemically pure), directing agent (the amount of directing agent added is Al in the reac...

Embodiment 2

[0041] Example 2: Preparation and ultra-stable treatment of the comparative sample Y molecular sieve

[0042] Step 1: Preparation of crystallization directing agent

[0043] According to 15Na 2 O: Al 2 o 3 : 15SiO 2 : 230H 2 The ratio of O is water glass (Beijing Red Star Soda Soda Factory, modulus: 3.1~3.4), NaOH (Beijing Chemical Plant, chemically pure, effective content ≮82%), NaAlO 2 (Beijing Chemical Plant, chemically pure) and H 2 After mixing O evenly, age at 30°C for 3 days to obtain the liquid phase directing agent.

[0044] Step 2: Synthesis of Y molecular sieve

[0045] According to 3.5Na 2 O: Al 2 o 3 : 9SiO 2 : 320H 2 The raw material proportioning of O, with water glass (same as above), NaOH (same as above), aluminum sulfate (Beijing chemical plant, chemically pure), directing agent (directing agent add-on is Al in the reaction system 2 o 3 10% of the total substance mass) and H 2 O mixed evenly to obtain an opaque milky white gel. The obtained gel...

Embodiment 3

[0052] Embodiment 3: Preparation and ultra-stable treatment of FeY molecular sieve

[0053] Step 1: Preparation of crystallization directing agent

[0054] With embodiment 1 step one, the heteroatom source Ti(SO 4 ) 2 Replaced by Fe(NO 3 ) 3 .

[0055] Step 2: Synthesis of FeY molecular sieve

[0056] With embodiment 1 step 2, the heteroatom source Ti(SO 4 ) 2 Replaced by Fe(NO 3 ) 3 , the content of Fe atoms in the crystallized product is 4.2wt%, and the Na in the crystallized product is analyzed by X-ray fluorescence detection. 2 O content is 15.2wt%, Al 2 o 3 Content is 22.9wt%, SiO 2 The content is 57.6wt%, Fe 2 o 3 The content is 4.3wt%, and the crystallinity of the FeY molecular sieve is 80% as detected by XRD.

[0057] Step 3: Ultra-stable treatment of FeY molecular sieve

[0058] With step 3 of embodiment 1, the heteroatom Y molecular sieve USFeY1 and USFeY2 of ultra-stable treatment are obtained through bis-cross-baking, wherein USFeY1 adds a small amo...

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Abstract

The present invention provides process of selecting proper hetero atom to modify the skeleton of Y-type molecular sieve and to raise the heat stability and hydrothermal stability of Y-type molecular sieve. The process includes direct hydrothermal crystallizing, adding proper amount of hetero atom to prepare MY-type molecular sieve containing skeleton hetero atom, performing the secondary ion exchange and secondary roasting of MY-type molecular sieve after adding small amount of hetero atom in the same kind to obtain USMY type molecular sieve with very high heat stability and hydrothermal stability. The molecular sieve with very high heat stability and hydrothermal stability is applied in the catalysts for catalytic cracking, hydrogenation cracking, etc of hydrocarbons.

Description

technical field [0001] The invention relates to a method for improving the hydrothermal stability of Y-type molecular sieves by using skeleton heteroatoms, belonging to the technical field of chemical industry. Background technique [0002] Y-type molecular sieve has a hollow skeleton structure, large specific surface area, good structural stability, and low production cost. Currently, it is mainly used as an active component of catalytic cracking catalysts for petroleum processing. [0003] Due to the harsh operating conditions of the catalytic cracking reaction, there is an environment of high temperature and high water vapor, so the cracking catalyst, especially the active component of the catalyst (such as Y molecular sieve) is required to have high thermal stability and hydrothermal stability. For the Y-type molecular sieve used in this kind of catalytic cracking reaction, in order to improve its hydrothermal stability, the usual treatment method is to perform ion excha...

Claims

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Application Information

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IPC IPC(8): C01B39/24B01J29/08
Inventor 沈志虹鞠雅娜赵俊桥朱俊哲陈然赵佳周冬严
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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