A kind of nano zsm-5 catalyst for the alkylation of benzene and methanol and its preparation method

A ZSM-5, catalyst technology, applied in the field of nano-catalyst and its preparation, can solve the problems of many by-products, low benzene conversion rate, low xylene yield, etc., and achieves less by-product types, improved conversion rate and, The effect of high catalyst activity

Active Publication Date: 2020-09-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Aiming at the technical defects in the prior art, such as generally low p-xylene yield, low benzene conversion rate, and many by-products, the present invention provides a nano ZSM-5 molecular sieve catalyst for the alkylation of benzene and methanol and its preparation method

Method used

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  • A kind of nano zsm-5 catalyst for the alkylation of benzene and methanol and its preparation method
  • A kind of nano zsm-5 catalyst for the alkylation of benzene and methanol and its preparation method
  • A kind of nano zsm-5 catalyst for the alkylation of benzene and methanol and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Preparation of catalyst raw powder

[0052] Raw materials include silicon source, aluminum source, template agent (M) is TPAOH, silane coupling agent (Q) is APTES, NaOH and water, prepare each raw material; template agent M 19.3814gTPAOH and 34.8g water are mixed, after stirring evenly, Add 0.051g of NaOH, mix well, stir and dissolve, continue to add 0.5g of aluminum source AIP, stir until complete hydrolysis to obtain solution A, add 26.097g of silicon source TEOS dropwise to the solution A, after 0.5h of complete hydrolysis, use The three-necked flask continued to reflux for 24 hours in a water bath at 80°C to obtain a seed crystal solution; 1.362 g of silane coupling agent (Q)APTES was added dropwise to the seed crystal solution, rinsed with 20 g of water, stirred in a water bath at 80°C for 6 hours, and the resulting material Transfer to a high-pressure hydrothermal synthesis kettle lined with polytetrafluoroethylene, and crystallize at 170°C for 72 hours to obt...

Embodiment 2

[0054] (1) Preparation of catalyst raw powder

[0055] Raw materials include silicon source, aluminum source, template agent (M) is TPAOH, silane coupling agent (Q) is APTES, NaOH and water, prepare each raw material; template agent M 19.3814gTPAOH and 34.8g water are mixed, after stirring evenly, Add 0.051g of NaOH, mix well, stir and dissolve, continue to add 0.5g of aluminum source AIP, stir until the template agent M and NaOH are completely dissolved to obtain solution A, add 26.097g of silicon source TEOS to the solution A dropwise, after 0.5h After the hydrolysis is complete, use a three-neck flask to reflux for 24 hours in a water bath at 80°C to obtain a seed solution; add 1.362 g of silane coupling agent (Q) APTES dropwise to the seed solution, rinse with 20 g of water, and stir in a water bath at 80°C 6h, the obtained material was transferred to a high-pressure hydrothermal synthesis kettle with a polytetrafluoroethylene liner, and crystallized at 170°C for 72h to ob...

Embodiment 3

[0067] (1) Preparation of catalyst raw powder

[0068] Raw materials include silicon source, aluminum source, template agent (M) is TPAOH, silane coupling agent (Q) is APTES, NaOH and water, prepare each raw material; template agent M 19.3814gTPAOH and 34.8g water are mixed, after stirring evenly, Add 0.051g of NaOH, mix well, stir and dissolve, continue to add 0.5g of aluminum source AIP, stir until the template agent M and NaOH are completely dissolved to obtain solution A, add 26.097g of silicon source TEOS to the solution A dropwise, after 0.5h After the hydrolysis is complete, use a three-neck flask to reflux for 24 hours in a water bath at 80°C to obtain a seed solution; add 1.362 g of silane coupling agent (Q) APTES dropwise to the seed solution, rinse with 20 g of water, and stir in a water bath at 80°C 6h, the obtained material was transferred to a high-pressure hydrothermal synthesis kettle with a polytetrafluoroethylene liner, and crystallized at 170°C for 72h to ob...

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Abstract

The invention discloses a modified molecular sieve catalyst for alkylation of benzene and methanol. The method uses ethyl orthosilicate (TEOS) and aluminum isopropoxide (AIP) as the silicon source and aluminum source, and uses tetrapropyl hydroxide Ammonium (TPAOH) is used as the template agent, and γ-aminopropyltriethoxysilane (APTES) is used as the silane coupling agent to prepare the nanomolecular sieve catalyst and obtain the catalyst silicon-aluminum ratio (nSiO 2 / Al 2 O 3 ) is 50 to 200. The oxides loaded with nickel and phosphorus are respectively active component modifiers. After impregnation, drying, and roasting, in the reaction of alkylation of benzene and methanol to produce toluene and p-xylene, the single-pass reaction of benzene The conversion rate can reach more than 59%, and the selectivity of toluene and xylene can reach more than 95%. It eliminates the by-product propylbenzene and greatly reduces the content of by-products such as ethylbenzene and toluene. The catalyst has good activity and shape selection. Characteristics of high sex.

Description

technical field [0001] The invention relates to a nanometer catalyst and a preparation method thereof, in particular to a modified nanometer ZSM-5 molecular sieve catalyst used for the alkylation of benzene and methanol and a preparation method thereof. Background technique [0002] In recent years, the output of pure benzene in my country has gradually increased, and the situation of overcapacity of benzene has gradually emerged; with the development of coal chemical industry, there has also been a serious surplus of methanol. However, toluene and xylene are important organic chemical raw materials, which are widely used in the fields of materials, textiles, medicine, and daily chemicals, and the domestic supply exceeds demand. Especially p-xylene (PX), which is one of the basic organic raw materials in the petrochemical industry, is widely used in chemical fiber, medicine, pesticide, synthetic resin, plastic, medicine and many other chemical production fields. From 2008 t...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01J29/46B01J35/08B01J35/10B01J37/08C07C2/86C07C15/08
CPCB01J29/46B01J37/08C07C2/864C07C2529/46B01J2229/18B01J35/51B01J35/615B01J35/633B01J35/647B01J35/651C07C15/08Y02P20/52
Inventor李建伟张艳君郭丹张佳瑾陈标华
OwnerBEIJING UNIV OF CHEM TECH