N-alkane isomerization catalyst and preparation method thereof

A technology of n-alkane and catalyst, which is applied in the field of catalyst and preparation of isobutane by isomerization of chlorine-free platinum series n-butane, and can solve the problems of fast deactivation, poor stability, poor selectivity and stability, etc. , to improve dispersion, promote uniform distribution, and ensure thermal stability

Active Publication Date: 2019-05-07
WANHUA CHEM GRP CO LTD
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When anhydrous aluminum chloride is used as a solid catalyst, the activity is high, but the selectivity and stability are poor
In recent years, SO 4 2- / ZrO 2 The representative solid superacid catalyst has attracted great attention. This type of catalyst can convert n-butane into isobutane at room temperature, but due to the serious problem of carbon deposition, its stability is extremely poor and its deactivation is extremely fast.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Catalyst preparation

[0051] (1) Weigh 26.40g aluminum sec-butoxide (molecular weight 246), 12.75g tetrabutyl titanate (molecular weight 340) and 5.51g zinc nitrate hexahydrate (molecular weight 297.5) and dissolve them in 60ml isopropanol solvent, fully stir Mix evenly for 1h to obtain a mixed solution;

[0052] (2) Add dropwise to the mixed solution, adjust the pH value to 5 with 5wt% dilute nitric acid aqueous solution to carry out the hydrolysis reaction, the hydrolysis time is 1h, stand and age at room temperature for 24h, dry at 80°C for 20h, 600°C Lower roasting for 4h to get ZnO-TiO 2 -Al 2 o 3 Composite oxide carrier;

[0053] (3) Weigh 0.033g Pt(NO 3 ) 2 (molecular weight: 319) and 0.065g Mn(NO 3 ) 2 (Molecular weight 179) was dissolved in 20ml of deionized water, made into a solution and stirred evenly, and the composite oxide carrier obtained in step (2) was immersed in equal volumes of platinum nitrate and manganese nitrate solution for 12h, dried ...

Embodiment 2

[0059] Catalyst preparation

[0060] (1) Weigh 23.96g aluminum sec-butoxide (molecular weight 246), 12.75g tetrabutyl titanate (molecular weight 340) and 7.10g zinc sulfate heptahydrate (molecular weight 287.5) and dissolve them in 60ml isopropanol solvent, fully stir Mixed evenly for 2h to obtain a mixed solution;

[0061] (2) Add 10wt% dilute nitric acid aqueous solution dropwise to the mixed solution to adjust the pH value to 5 to carry out the hydrolysis reaction. The hydrolysis time is 1h, and it is aged at room temperature for 20h, dried at 80°C for 20h, and then dried at 500°C. Roasted for 6h to get ZnO-TiO 2 -Al 2 o 3 Composite oxide carrier;

[0062] (3) Weigh 0.016g Pt(NO 3 ) 2 (molecular weight: 319) and 0.098g Mn(NO 3 ) 2 (Molecular weight 179) was dissolved in 20ml of deionized water, made into a solution and stirred evenly, the composite oxide carrier obtained in step (2) was immersed in equal volumes of platinum nitrate and manganese nitrate solution for...

Embodiment 3

[0066] Catalyst preparation

[0067] (1) Take by weighing 33.62g aluminum sec-butoxide (molecular weight 246), 7.12g tetraisopropyl titanate (molecular weight 284) and 3.67g zinc nitrate hexahydrate (molecular weight 297.5) and dissolve in 70ml isopropanol solvent together, fully Stir for 1.5h and mix evenly to obtain a mixed solution;

[0068] (2) Add dropwise to the mixed solution, adjust the pH value to 5 with dilute nitric acid aqueous solution to carry out the hydrolysis reaction, the hydrolysis time is 2 hours, stand and age at room temperature for 30 hours, dry at 70°C for 24 hours, and roast at 500°C for 6 hours , to get ZnO-TiO 2 -Al 2 o 3 Composite oxide carrier;

[0069] (3) Weigh 0.049g Pt(NO 3 ) 2 (molecular weight: 319) and 0.033g Mn(NO 3 ) 2 (Molecular weight 179) was dissolved in 20ml of deionized water, made into a solution and stirred evenly, and the composite oxide carrier obtained in step (2) was immersed in equal volumes of platinum nitrate and man...

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

PropertyMeasurementUnit
particle size (mesh)aaaaaaaaaa
Login to view more

Abstract

The invention discloses an n-alkane isomerization catalyst and a preparation method thereof. According to the catalyst, a ZnO-TiO2-Al2O3 composite oxide is used as a carrier, metal Pt is used as an active component, and Mn is used an auxiliary agent; based on the mass of the catalyst, the metal Pt content is 0.05-1.0 wt%, the auxiliary agent Mn content is 0.05-1.0 wt%, the ZnO content is 5-30 wt%,the TiO2 content is 10-80 wt%, and the balance is Al2O3; and the catalyst is prepared by using sol-gel method so as to ensure the thermal stability of the catalyst carrier, the sufficient specific surface area and the sufficient pore volume of the catalyst carrier. According to the present invention, the catalyst can be used in a hydrogen present atmosphere, has good effect in the n-alkane isomerization production of isobutane, has high activity under low temperature conditions, has isobutane selectivity of over 95%, and has good stability. .

Description

technical field [0001] The present invention relates to a catalyst for isomerization of n-paraffins and a preparation method thereof, in particular to a catalyst for preparing isobutane by isomerization of a chlorine-free platinum series n-butane supported on a composite oxide carrier and its preparation method. Background technique [0002] Isobutane, the isomerization product of n-butane, is the main raw material for the alkylation reaction and an important precursor for the synthesis of gasoline additives such as methyl tert-butyl ether (MTBE). Isobutane is widely used in many fields such as dyes, chemically synthesized refrigerants, synthetic rubber, and aviation gasoline. However, the utilization rate of n-butane is relatively low, and its added value can be greatly improved after isomerization into isobutane. [0003] The Butamer process developed by the UOP company in the United States is a representative n-butane isomerization process. This process is a typical lo...

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): B01J23/889B01J35/10B01J37/03B01J37/08B01J37/02C07C5/27C07C9/12
Inventor 蒋锋孔祥明李江常林张宏科华卫琦
Owner WANHUA CHEM GRP CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap