Perovskite type composite oxygen carrier and application thereof

A perovskite-type, oxygen-carrier technology, applied in chemical instruments and methods, from carbon oxides to hydrocarbons, physical/chemical process catalysts, etc., to reduce secondary reactions, inhibit secondary hydrogenation reactions, and improve olefins selective effect

Active Publication Date: 2021-01-05
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] LaFeO 3 It is a kind of oxygen carrier with application prospect, because of its moderate oxidation ability, it can be absorbed by CO 2 Or water vapor and other weak oxidizing atmospheres, mostly used in methane reforming, but there are few reports on hydrogenation to prepare low-carbon olefins

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0017] The composition preparation method is: (1) according to Zn 2+ / Fe 3+ The molar ratio is 0.5, and a certain amount of zinc nitrate and ferric nitrate are dissolved in 50ml of deionized water. Press [NaBH 4 ] / [Zn 2+ +Fe 3+ ] The molar ratio is 2, NaBH 4 Dissolve in 70 ml deionized water. The above two solutions were slowly and evenly added to the colloid mill, and vigorously stirred for 3 min to fully reduce the metal ions to obtain a mixed solution containing nano-metal particles. Continue to stir vigorously for 1 min, transfer the above mixed solution to a high-pressure reactor with a polytetrafluoroethylene liner, conduct hydrothermal crystallization at 150 °C for 12 h, then cool naturally to room temperature, centrifuge and wash. After drying naturally in the air, transfer it to a drying oven at 110 °C for 24 h, and then place it in a muffle furnace at 800 °C for 6 h at a constant temperature and then crush it to obtain ZnFe 2 o 4 . Denoted as component A.

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Embodiment 1

[0021] Based on the total amount of 3g of catalyst, weigh 70% of component A, 20% of component B, and 10% of component C, and mix them mechanically.

Embodiment 2

[0023] Based on the total amount of 3g of catalyst, weigh 60% of component A, 30% of component B, and 10% of component C, and mix them mechanically.

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PUM

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Abstract

The invention discloses an application of a doped perovskite composite oxygen carrier for preparing ethylene, propylene and butene by applying CO2 hydrogenation. The problem that a single LaFeO3 oxygen carrier is poor in catalytic activity is solved, and the compounded oxygen carrier shows good low-carbon olefin selectivity in a CO2 hydrogenation reaction. The doped perovskite composite oxygen carrier has a certain industrial significance.

Description

technical field [0001] The invention relates to the technical field of oxygen carrier application, and relates to the application of CO doped perovskite composite oxygen carrier 2 Hydrogenation to produce ethylene, propylene, butene. Background technique [0002] The hydrogenation of carbon dioxide as raw material to prepare low-carbon olefins can not only alleviate the environmental pressure caused by carbon dioxide emissions, but also realize the effective use of carbon dioxide resources. From the perspective of thermodynamics, low temperature and high pressure are beneficial to the formation of low-carbon olefins. The suitable reaction conditions should be temperature 573-673K, pressure 2.0-3.0MPa, H2 / CO 2 =3, under this condition the equilibrium conversion rate of carbon dioxide is 72.8% to 74.5%. The direct hydrogenation of carbon dioxide to light olefins can be divided into two steps: reverse water gas shift reaction and continuous Fischer-Tropsch synthesis. At pres...

Claims

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Application Information

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IPC IPC(8): B01J27/22C07C1/12C07C11/04C07C11/06C07C11/08
CPCB01J27/22C07C1/12C07C11/04C07C11/06C07C11/08Y02P20/52
Inventor 郭庆杰马利海张建利赵天生高新华马清祥
Owner NINGXIA UNIVERSITY
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