Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of silane modified composite molecular sieve

A compound molecular sieve and silane modification technology, which is applied in the direction of molecular sieve and alkali-exchanged phosphate, molecular sieve characteristic silicoaluminophosphate, crystalline aluminosilicate zeolite, etc., can solve problems such as hindering application and rapid deactivation

Pending Publication Date: 2022-07-12
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its application in actual production is seriously hindered due to its microporous pore structure and rapid deactivation due to coke deposition after reaction.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of silane modified composite molecular sieve
  • Preparation method of silane modified composite molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) The synthesis of composite molecular sieve adopts hydrothermal synthesis method. Firstly, SAPO-34 mother liquor was prepared. Pseudoboehmite was used as aluminum source, TEOS was used as silicon source, orthophosphoric acid (H3PO4) was used as phosphorus source, and diethylamine (DEA) was used as template agent. glue, the molar ratio of aluminum source, phosphorus source, silicon source, diethylamine (DEA) and distilled water is 1.0Al 2 O 3 : 1.0P 2 O 5 : 0.6SiO 2 : 2.0 DEA: 60H 2 O;

[0024] 2) Add ZSM-5 molecular sieve powder to SAPO-34 mother liquor, and after stirring to form solution A, ZSM-5 crystals and SAPO-34 suspending gel are mixed uniformly at a certain weight ratio of 1:2;

[0025] 3) Add the mixed solution of piperazinylpropylmethyldimethoxysilane coupling agent (PZPMS) and cetyltrimethylammonium bromide (CTAB) to solution A, the amount of silane added, n(P2O5 ):n(silane)=1:0.3.

[0026] Continue stirring to form a gel precursor, transfer the ge...

Embodiment 2

[0029] 1) The synthesis of composite molecular sieve adopts hydrothermal synthesis method. Firstly, SAPO-34 mother liquor was prepared. Pseudoboehmite was used as aluminum source, TEOS was used as silicon source, orthophosphoric acid (H3PO4) was used as phosphorus source, and diethylamine (DEA) was used as template agent. glue, the molar ratio of aluminum source, phosphorus source, silicon source, diethylamine (DEA) and distilled water is 1.0Al 2 O 3 : 1.0P 2 O 5 : 0.6SiO 2 : 2.0 DEA: 60H 2 O;

[0030] 2) Add ZSM-5 molecular sieve powder to SAPO-34 mother liquor, and after stirring to form solution A, ZSM-5 crystals and SAPO-34 suspending gel are mixed uniformly at a certain weight ratio of 1:2;

[0031] 3) Add the mixed solution of piperazinylpropylmethyldimethoxysilane coupling agent (PZPMS) and cetyltrimethylammonium bromide (CTAB) to solution A, the amount of silane added, n(P2O5 ):n(silane)=1:0.5.

[0032] Continue stirring to form a gel precursor, transfer the ge...

Embodiment 3

[0035] 1) The synthesis of composite molecular sieve adopts hydrothermal synthesis method. Firstly, SAPO-34 mother liquor was prepared. Pseudoboehmite was used as aluminum source, TEOS was used as silicon source, orthophosphoric acid (H3PO4) was used as phosphorus source, and diethylamine (DEA) was used as template agent. glue, the molar ratio of aluminum source, phosphorus source, silicon source, diethylamine (DEA) and distilled water is 1.0Al 2 O 3 : 1.0P 2 O 5 : 0.6SiO 2 : 2.0 DEA: 60H 2 O;

[0036] 2) Add ZSM-5 molecular sieve powder to SAPO-34 mother liquor, and after stirring to form solution A, ZSM-5 crystals and SAPO-34 suspending gel are mixed uniformly at a certain weight ratio of 1:2;

[0037] 3) Add a mixed solution of [3-(trimethoxysilylpropyl)]octadecyldimethylammonium chloride (TPOAC) and cetyltrimethylammonium bromide (CTAB) to solution A, The amount of silane added, n(P2O5):n(silane) =1:0.3.

[0038] Continue stirring to form a gel precursor, transfer ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the technical field of molecular sieve synthesis, in particular to a preparation method of a silane modified composite molecular sieve, and a ZSM-5 / SAPO-34 composite molecular sieve with better crystallinity and grain size is synthesized by adopting a silane coupling agent and a cationic surfactant hexadecyl trimethyl ammonium bromide to form a double template.

Description

technical field [0001] The invention relates to the technical field of molecular sieve synthesis, in particular to a preparation method of a silane-modified composite molecular sieve. Background technique [0002] ZSM-5 molecular sieve has good thermal stability and three-dimensional pores, and is widely used in chemical reactions such as methanol to olefins (MTO) and methanol to aromatics (MTA). However, its pore structure is microporous and it is easily deactivated due to coke deposition after the reaction, which seriously hinders its application in practical production. SAPO-34 is considered to be an important catalyst for petrochemical reactions, especially methanol-to-olefins conversion, with mild acidity and high hydrothermal stability. The catalytic performance of the two symbiotic molecular sieves for the MTO / MTA reaction is not inferior. A core / shell structured ZSM-5 / SAPO-34 composite catalyst was hydrothermally synthesized by overgrowing SAPO-34 molecular sieve...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B39/38C01B37/08
CPCC01B39/54C01B39/38C01B37/08C01B39/026C01P2004/80C01P2002/72C01P2004/03Y02P30/40
Inventor 张玲常笑雨
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY