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Nano ZSM-5 catalyst for alkylation of benzene and methanol and preparation method thereof

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

Active Publication Date: 2019-12-24
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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  • Nano ZSM-5 catalyst for alkylation of benzene and methanol and preparation method thereof
  • Nano ZSM-5 catalyst for alkylation of benzene and methanol and preparation method thereof
  • Nano ZSM-5 catalyst for alkylation of benzene and methanol and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Preparation of raw catalyst powder

[0052] The 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; mix template agent M19.3814g TPAOH and 34.8g water, and stir evenly. Add 0.051g of NaOH, mix well, stir to dissolve, continue to add 0.5g of aluminum source AIP, stir until it is completely hydrolyzed to obtain solution A, drop 26.097g of silicon source TEOS into the solution A, after 0.5h hydrolysis is complete, use The three-necked flask was refluxed in a water bath at 80°C for 24h to obtain a seed crystal solution; 1.362g of silane coupling agent (Q)APTES was added dropwise to the seed solution, rinsed with 20g water, stirred in a water bath at 80°C for 6h, and the resulting material Transfer to a high-pressure hydrothermal synthesis kettle with polytetrafluoroethylene lining, and crystallize at 170°C for 72 hours to obtain a crystalline product; after the c...

Embodiment 2

[0054] (1) Preparation of raw catalyst powder

[0055] The raw materials include silicon source, aluminum source, template (M) is TPAOH, silane coupling agent (Q) is APTES, NaOH, and water. Prepare each raw material; mix template M19.3814g TPAOH with 34.8g water, and stir evenly. Add 0.051g of NaOH, mix well, stir to dissolve, continue to add 0.5g of aluminum source AIP, stir until template M and NaOH are completely dissolved to obtain solution A, add 26.097g of silicon source TEOS to said solution A dropwise, after 0.5h After the hydrolysis is complete, use a three-necked flask to continue refluxing in a water bath at 80°C for 24h to obtain a seed solution; add 1.362g of the silane coupling agent (Q) APTES dropwise to the seed solution, rinse with 20g of water, and stir in a water bath at 80°C 6h, transfer the obtained material to a high-pressure hydrothermal synthesis kettle with polytetrafluoroethylene lining, and crystallize at 170°C for 72h to obtain a crystalline product; a...

Embodiment 3

[0067] (1) Preparation of raw catalyst powder

[0068] The raw materials include silicon source, aluminum source, template (M) is TPAOH, silane coupling agent (Q) is APTES, NaOH, and water. Prepare each raw material; mix template M19.3814g TPAOH with 34.8g water, and stir evenly. Add 0.051g of NaOH, mix well, stir to dissolve, continue to add 0.5g of aluminum source AIP, stir until template M and NaOH are completely dissolved to obtain solution A, add 26.097g of silicon source TEOS to said solution A dropwise, after 0.5h After the hydrolysis is complete, use a three-necked flask to continue refluxing in a water bath at 80°C for 24h to obtain a seed solution; add 1.362g of the silane coupling agent (Q) APTES dropwise to the seed solution, rinse with 20g of water, and stir in a water bath at 80°C 6h, transfer the obtained material to a high-pressure hydrothermal synthesis kettle with polytetrafluoroethylene lining, and crystallize at 170°C for 72h to obtain a crystalline product; a...

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Abstract

The invention discloses a modified molecular sieve catalyst for alkylation of benzene and methanol. According to the method, tetraethoxysilane (TEOS) and aluminum isopropoxide (AIP) are used as a silicon source and an aluminum source; tetrapropylammonium hydroxide (TPAOH) is used as a template agent; gamma-aminopropyltriethoxysilane (APTES) is used as a silane coupling agent, so that the nano molecular sieve catalyst is prepared, wherein the silica-alumina ratio (nSiO2 / Al2O3) of the prepared catalyst is 50 to 200; oxides of nickel and phosphorus are respectively supported as active component modifiers, and the catalyst is preapred through impregnation, drying and roasting treatments; by using the catalyst, in the reaction of preparing methylbenzene and p-xylene through benzene and methanolalkylation, the one-way conversion rate of benzene can reach 59% or above, the selectivity of methylbenzene and xylene can reach 95% or above, by-products of propylbenzene are eliminated, the contentof by-products of ethylbenzene, methyl ethylbenzene and the like is greatly reduced, and the catalyst has the characteristics of good activity, high shape selectivity and the like.

Description

Technical field [0001] The invention relates to a nano catalyst and a preparation method thereof, in particular to a modified nano ZSM-5 molecular sieve catalyst for alkylation of benzene and methanol and a preparation method thereof. Background technique [0002] In recent years, the production of pure benzene in my country has gradually increased, and the overcapacity of benzene has gradually emerged; with the development of coal chemical industry, methanol has also appeared in a serious excess. However, toluene and xylene are important organic chemical raw materials, which are widely used in materials, textiles, medicine, daily chemicals and other fields, and domestic demand exceeds demand. In particular, paraxylene (PX) is one of the basic organic raw materials in the petrochemical industry, and has a wide range of uses in many chemical production fields such as chemical fiber, medicine, pesticide, synthetic resin, plastic, and medicine. From 2008 to 2012, the production of ...

Claims

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Application Information

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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
Owner BEIJING UNIV OF CHEM TECH
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