Preparation method and application of perovskite catalyst

A catalyst and perovskite technology, which is applied in the field of modification of titanium ore catalysts, can solve the problems of catalyst deactivation, low selectivity of low-carbon olefins, crushing and pulverization, etc., so as to inhibit the secondary hydrogenation reaction and improve the olefin Selectivity, reducing the effect of secondary reactions

Active Publication Date: 2020-12-25
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Metal Fe will be carbonized to form iron carbide during the reaction process. Although the formation of iron carbide does not affect the activity and is even beneficial to the selectivity, the change of the catalyst structure will lead to the phenomenon of carbon deposition, fragmentation and pulverization of the catalyst, so...

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  • Preparation method and application of perovskite catalyst

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Effect test

Embodiment 1

[0014] Weigh 6.5g of lanthanum nitrate, 10.1g of ferric nitrate, 6.25g of manganese nitrate, 19.2g of citric acid, dissolve in distilled water, stir and evaporate the solution in a water bath at 75°C until it becomes gelatinous, then put it in an oven at 105°C for 10 hours for further drying. To the heated dry powder was added 0.8 g of potassium ethoxide. Dry in an oven at 70°C for 10 h. Then grind the dry powder, put it in a muffle furnace, raise the temperature from room temperature to 450°C at a rate of 10°C / min and keep the temperature constant for 1h, then continue to heat up to 780°C at a rate of 5°C / min, keep it for 4h, take it out and cool it for collection , the catalyst samples were obtained after grinding. Denoted as sample 1. figure 1 It is the XRD pattern of sample 1, which shows that the perovskite type LaFeMnO was successfully prepared 3 .

Embodiment 2

[0016] Weigh 6.5g of lanthanum nitrate, 10.1g of ferric nitrate, 6.25g of manganese nitrate, 19.2g of citric acid, dissolve in distilled water, and add 1.6g of potassium ethoxide to the solution. Stir in a water bath at 75°C and evaporate to dryness until gelatinous, then place it in an oven at 105°C for 10 h for further drying. Grind the dry powder, place it in a muffle furnace, raise the temperature from room temperature to 450°C at a rate of 10°C / min and keep the temperature constant for 1 hour, then continue to heat up to 850°C at a rate of 5°C / min, keep it warm for 4 hours, take it out for cooling, collect, and grind Catalyst samples were then obtained. Denoted as sample 2.

Embodiment 3

[0018] Weigh 6.5g of lanthanum nitrate, 10.1g of ferric nitrate, 6.25g of manganese nitrate, 19.2g of citric acid, dissolve in distilled water, and add 1.2g of potassium tert-butoxide into the solution. Stir in a water bath at 80°C and evaporate to dryness until gelatinous, then place it in an oven at 105°C for 10 hours for further drying. Grind the dry powder, put it in a muffle furnace, raise the temperature from room temperature to 450°C at a rate of 10°C / min and keep the temperature constant for 1h, then continue to raise the temperature to 850°C at a rate of 5°C / min, keep it warm for 4h, take it out and cool it for collection, and grind Catalyst samples were then obtained. Denoted as sample 3.

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Abstract

The invention relates to a modified titanium ore catalyst which is applied to preparation of ethylene, propylene and butene through CO or CO2 hydrogenation. The catalyst shows good CO hydrogenation performance after being treated and modified by potassium ethoxide and potassium tert-butoxide, the selectivity of low-carbon olefin is kept at 50% or above, and the olefin-to-alkane ratio (O/P) can reach 5.6. Potential economic value is realized.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, and relates to the modification of a titanium ore catalyst, which is applied to CO or CO 2 Hydrogenation to produce ethylene, propylene, butene. Background technique [0002] Low-carbon olefins are important chemical basic raw materials with a wide range of uses. In the CO hydrogenation process, affected by the phase change of the active components, the main reactions including the synthesis of alkenes and alkanes and the conversion of CO, as well as the generation of methane and oxygenates, the disproportionation reaction of CO, and the surface carbon in the Internal side effects. [0003] Perovskite oxide is a new type of inorganic non-metallic material with unique physical and chemical properties. It has been found in a large number of studies that perovskite oxide has stable and controllable structure, good thermal stability and high catalytic efficiency. , low cost and other ...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J35/02C07C1/04C07C1/12C10G2/00
CPCB01J23/002B01J23/8892B01J35/023B01J35/026B01J2523/00C07C1/044C07C1/12C07C2523/889C10G2/332C10G2/50B01J2523/3706B01J2523/72B01J2523/842C07C11/04C07C11/06C07C11/08C07C9/04Y02P20/52
Inventor 郭庆杰马利海张建利
Owner NINGXIA UNIVERSITY
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