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A catalyst for oxidative dehydrogenation of light alkanes to olefins, its optimization method and application

A low-carbon alkane, oxidative dehydrogenation technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, hydrocarbons, etc., to achieve high olefin yield, high conversion rate of low-carbon alkane, and improve catalytic performance

Active Publication Date: 2019-10-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the direct application of boron nitride materials or their functionalized derivatives in the oxidative dehydrogenation of low-carbon alkanes

Method used

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  • A catalyst for oxidative dehydrogenation of light alkanes to olefins, its optimization method and application
  • A catalyst for oxidative dehydrogenation of light alkanes to olefins, its optimization method and application
  • A catalyst for oxidative dehydrogenation of light alkanes to olefins, its optimization method and application

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Experimental program
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Effect test

Embodiment 1

[0034] Add 6.916g of bulk boron nitride powder and 4.58g of urea, the molar ratio of boron nitride and urea is 1:5, put them into a ball mill jar, and mill for 6 hours alternately. After ball milling, add 184ml deionized water to dissolve and disperse, and ultrasonicate in water bath for 2h. The liquid mixture after ultrasound is transferred to a dialysis zone for dialysis to remove urea, and then centrifuged at 3000 rpm for 30 minutes, and the obtained liquid mixture is dried overnight in an oven to obtain boron nitride nanosheets.

Embodiment 2

[0036] Add 0.63g of melamine, 0.45g of urea and 1.86g of boric acid into a ball mill jar for ball milling for 2 hours. The molar ratio of nitrogen atoms to boron atoms is 1.5:1, and the molar ratio of melamine to urea nitrogen atoms is 1:0.5. Add 10ml of ethanol to dissolve the raw material, and then evaporate until the residual solvent is 0.5mL. Transfer the wet material to a tube furnace, react at 1000°C for 1.5h, control NH 3 The flow rate is 80mL / min, and the product after vapor deposition is washed and dried. The specific surface area of ​​the sample is 487m 2 / g.

Embodiment 3

[0038] 0.33g of boron powder and 1.22g of magnesium oxide, the molar ratio of boron powder and magnesium oxide is 1:1, put into the ball mill jar and mill for 6 hours. The milled mixture was transferred to a BN boat in a vertical induction furnace. 200mL / min Ar purge and gradually increase the temperature, when it reaches 1300℃, introduce 100mL / min NH from bottom to top 3 , kept for 2 hours, the fluffy boron nitride was collected on the BN boat and the wall of the reaction chamber, and the product was characterized by SEM as a nanotube structure with a diameter ranging from a few nanometers to 70nm and a length of up to 10μm.

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Abstract

Belonging to the technical field of industrial catalysis, the invention discloses a catalyst for oxidative dehydrogenation of light alkane to prepare olefin, an optimization method and application thereof. The catalyst for oxidative dehydrogenation of light alkane to prepare olefin is a solid non-metal catalyst, is composed of nitrogen atoms and boron atoms, is sp<2> or sp<3> hybridized hexagonal boron nitride, cubic boron nitride and rhombohedral, and presents a boron nitride crystal structure. By means of surface functionalization (preferably hydroxylation), the catalyst surface structure can be optimized. The catalyst can be used for oxidative dehydrogenation reaction of single component and multicomponent light alkane to prepare olefin, the alkane conversion rate and olefin selectivity are high, and the content of generated CO2 is smaller than 5%. Compared with the prior art, the catalyst provided by the invention has no need of loading other metal / metal oxide and other active components, the process is simple, and can significantly improve olefin yield, and the catalyst has good long-term stability, and very low CO2 emission, thus having good industrial development and application prospects.

Description

technical field [0001] The invention relates to a catalyst for oxidative dehydrogenation of low-carbon alkanes to olefins, its optimization method and application in the reaction of oxidative dehydrogenation of low-carbon alkanes (C2-C6) to olefins, belonging to the technical field of industrial catalysis. Background technique [0002] Low-carbon olefins (such as ethylene, propylene, butadiene, isobutylene, etc.) are an important class of basic organic chemical raw materials, which are widely used in aerospace, daily chemicals, civil fuels, building materials, packaging and textiles, etc. . At present, the main source of low-carbon olefins is the steam cracking process of gasoline, naphtha and liquefied petroleum gas. The reaction temperature is generally 800-1000 °C, there are many types of by-products, the separation process is complicated, the energy consumption is high, and the equipment and materials are expensive. . In recent years, the dehydrogenation of low-carbon ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C07C5/333C07C11/04C07C11/06C07C11/09
CPCB01J27/24C07C5/333C07C11/04C07C11/06C07C11/09Y02P20/52
Inventor 陆安慧石磊李文翠
Owner DALIAN UNIV OF TECH
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