Vanadium-based catalyst for light alkane dehydrogenation to produce alkene and preparation method and process thereof

A technology for producing low-carbon alkanes and olefins, which is applied in the direction of hydrocarbons, hydrocarbons, molecular sieve catalysts, etc., can solve the problems of easy aggregation and crystallization of active components, low dispersion of metal vanadium, poor single-pass stability, etc., to avoid precious metals. The use of high specific surface area, the effect of improving dispersibility

Active Publication Date: 2014-12-24
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the existing vanadium-based catalysts for dehydrogenation of low-carbon alkane to olefins, metal vanadium has low dispersion at high dosage, easy aggregation and crystallization of active components, low selectivity at high temperature, and poor single-pass stability. The problem is to provide a new method for the dehydrogenation of low-carbon alkanes to olefins, using a supported vanadium-based catalyst. The catalyst has a simple preparation method, a high dispersion of active components, and a high unit effective utilization rate. When used under certain conditions, the catalyst has the advantages of slow carbon deposition deactivation rate, high catalyst stability and high selectivity of target olefins

Method used

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  • Vanadium-based catalyst for light alkane dehydrogenation to produce alkene and preparation method and process thereof
  • Vanadium-based catalyst for light alkane dehydrogenation to produce alkene and preparation method and process thereof
  • Vanadium-based catalyst for light alkane dehydrogenation to produce alkene and preparation method and process thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 40g V 2 o 5 and 400mL of tert-butanol were added to 1.2L of toluene, at 110 o Reaction under C for 24h, the water produced in the reaction process is separated out with a water trap, along with V 2 o 5 Dissolution, the solution turns from light yellow to red, after the reaction is completed, the unreacted V 2 o 5 Remove by filtration, then distill off toluene and tert-butanol under reduced pressure to obtain V(OC(CH 3 ) 3 ) 3 O white crystals, the product was again at 100 o C for 12 hours under vacuum. Under the protection of Ar, 12.45g of the prepared V(OC(CH 3 ) 3 ) 3 O and 95g of pure silicon molecular sieve MCM-41 were added to 300mL of toluene, left to stand at room temperature for 12 hours, then the toluene was distilled off under reduced pressure, and then at 120 o C for 2 hours, and finally at 600 o Calcined at C for 5 hours to obtain the corresponding supported vanadium-based catalyst, the active component VO 4 3- 5% of the weight of the catal...

Embodiment 2

[0034] 40g V 2 o 5 and 400mL tert-butanol were added to 1.2L toluene, at 60 o Reaction under C for 48h, the water produced in the reaction process is separated out with a water trap, along with V 2 o 5 Dissolution, the solution turns from light yellow to red, after the reaction is completed, the unreacted V 2 o 5 Remove by filtration, then distill off toluene and tert-butanol under reduced pressure to obtain V(OC(CH 3 ) 3 ) 3 O white crystals, the product was again at 90 o C for 24 hours under vacuum. in N 2 Under protection, 2.49g of prepared V(OC(CH 3 ) 3 ) 3 O and 99g pure silicon molecular sieve MCM-41 are added in 300mL toluene, at 10 o C under standing for 24 hours, then the toluene was distilled off under reduced pressure, and then at 90 o C for 24 hours, and finally at 500 o Roasting at C for 24 hours, the corresponding supported vanadium-based catalyst, the active component VO 4 3- 1% of the weight of the catalyst. Before the prepared catalyst ca...

Embodiment 3

[0037] 40g V 2 o 5 and 400mL tert-butanol were added to 1.2L benzene, at 80 o C under reaction 10h, the water produced in the reaction process is separated out with a water trap, and the unreacted V 2 o 5 Remove by filtration, then distill off the solvent and tert-butanol under reduced pressure to obtain V(OC(CH 3 ) 3 ) 3 O white crystals, the product was again at 150 o C for 1 hour in vacuo. Under the protection of Ar, 24.90 g of the prepared V(OC(CH 3 ) 3 ) 3 O and 90g pure silicon molecular sieve MCM-41 are added in 300mL benzene, at 60 o C for 1 hour, then distilled benzene under reduced pressure, and then at 150 o C for 1 hour, and finally at 650 o Calcined at C for 1 hour to obtain the corresponding supported vanadium-based catalyst, the active component VO 4 3- 10% of the weight of the catalyst. Before the prepared catalyst catalyzes the dehydrogenation reaction, the catalyst is heated in air at 600 o C for 1 hour to obtain catalyst C.

[0038]

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Abstract

The invention relates to a method for preparing alkene from light alkane dehydrogenation, and mainly solves the problems of low dispersion, easy aggregation crystallization of active components, low selectivity under high temperature and poor one-way stability in the existing vanadium-based catalyst under high loading. The invention provides a vanadium-based catalyst for light alkane dehydrogenation to produce alkene and a preparation method thereof. The catalyst uses a silicon-based material as a carrier, vanadium or its oxide as the active component, and uses a synthetic method for preparation. Under the condition of low O2 concentration, a combined oxidative dehydrogenation and direct dehydrogenation method s used for catalysis of alkane preparation from alkane dehydrogenation; and finally the catalyst is subjected to charking for regeneration. The technical scheme well solves the above problems, and can be used for in the industrial production of alkene preparation from light alkane dehydrogenation.

Description

technical field [0001] The invention relates to a vanadium-based catalyst for dehydrogenating low-carbon alkanes to olefins, a preparation method and a process method thereof. Background technique [0002] Dehydrogenation of alkanes is of great significance to the effective utilization of petrochemical resources. At present, a large number of low-carbon alkanes obtained from oil refineries are the main components of liquefied petroleum gas, which are mainly used as civil fuels, have not been fully utilized, and have low added value. The use of low-carbon alkanes to dehydrogenate to produce low-carbon olefins has a huge application prospect. Low-carbon olefins are an important organic chemical raw material, widely used in the production of pharmaceuticals, plastics, synthetic rubber, gasoline additives, ion exchange resins, detergents, fragrances and various chemical intermediates. With the development of the chemical industry, the demand for low-carbon olefins has grown ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C11/08C07C5/48B01J29/78B01J29/035B01J23/22
CPCY02P20/52
Inventor 曾铁强吴文海樊志贵姜冬宇吴省缪长喜
Owner CHINA PETROLEUM & CHEM CORP
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