Cerium modified lanthanum oxide catalyst and preparation method and application thereof

A lanthanum oxide and catalyst technology, applied in the field of preparation of cerium additive modified lanthanum oxide catalyst, can solve problems such as slow speed, achieve long service life, improve oxygen transport/migration ability, excellent catalytic performance and thermal stability. Effect

Active Publication Date: 2018-03-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But does the Ce additive have an effect on La 2 o 3 It has other promoting effects that still need to be verified
In addition, although La 2 o 2 CO 3 It has the ability to eliminate carbon deposits, but the reaction rate with carbon deposits is slow, which belongs to the reaction rate control step

Method used

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  • Cerium modified lanthanum oxide catalyst and preparation method and application thereof
  • Cerium modified lanthanum oxide catalyst and preparation method and application thereof
  • Cerium modified lanthanum oxide catalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Take lanthanum nitrate hexahydrate (La(NO 3 ) 3 ·6H 2 O) and urea (CO(NH 2 ) 2 ) were completely dissolved in deionized water respectively, and after complete dissolution, the above two solutions were mixed and continuously stirred; in the resulting mixed solution, La 3+ The molar concentration of the substance is 0.015mol / L, and the molar concentration of the urea substance is 0.30mol / L; add ammonia water to the resulting mixed solution to adjust the pH to 8.5, stir in a water bath at 90°C for 3 hours, and the obtained white suspension Naturally cool to room temperature; centrifuge the suspension, wash the obtained precipitate twice with absolute ethanol and centrifuge; dry the white precipitate at 80°C until it is completely dry, and then roast it at 500°C 2 hours, obtain hexagonal lanthanum oxycarbonate (La 2 o 2 CO 3 ) carrier.

[0032] (2) Take cerium nitrate hexahydrate (Ce(NO 3 ) 2 ·6H 2 O) be completely dissolved in deionized water, and the hexago...

Embodiment 2

[0035] Adopt embodiment 1 method to carry out catalyst preparation cerium modified lanthanum oxide catalyst, its difference is only in (one) in mixed solution La 3+ The concentration of the substance is 0.010mol / L.

Embodiment 3

[0037] Adopt embodiment 1 method to carry out catalyst preparation cerium modified lanthanum oxide catalyst, its difference is only in (one) in mixed solution La 3+ The concentration of the substance is 0.020mol / L.

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Abstract

The invention belongs to rare earth element auxiliary modified lanthanum oxide catalysts and discloses a cerium modified lanthanum oxide catalyst and a preparation method and application thereof. Thecatalyst is obtained by uniformly dispersing cerium oxide nanoparticles on the surface of a lanthanum oxide carrier, and a chemical metering proportion of Ce/La is 0.10-0.20. The preparation method includes: taking and completely dissolving hexahydrate cerous nitrate in deionized water, and using an obtained solution to soak a hexagonal oxygen lanthanum carbonate carrier through a wet process; performing rotary evaporation on an obtained sample, and performing depressurizing distillation until a solvent is completely evaporated, drying to be dry, grinding, and calcining. The catalyst can be applied to preparing cerium modified nickel loaded lanthanum oxide catalysts. The invention demonstrates effect of a cerium auxiliary on the surface of lanthanum oxide; by regulating and controlling adsorption and activation of CO2 on the surface of lanthanum oxide, the catalyst can be used for participating in eliminating accumulated carbon in the process of methane dry gas reforming to prepare synthetic gas, so that reaction rate of this speed control step of eliminating accumulated carbon reaction is increased, and activity and stability of the catalyst are improved.

Description

technical field [0001] The invention belongs to the technical field of rare earth element additive modified lanthanum oxide catalyst, specifically, it relates to a preparation method and application of a cerium additive modified lanthanum oxide catalyst, which can effectively regulate CO 2 Adsorption and activation process on the surface of lanthanum oxide. Background technique [0002] Lanthanum oxide is a common rare earth element oxide with strong basicity, which is usually used as a carrier or additive to promote CO 2 adsorption and activation. Usually, CO 2 will be adsorbed on La 2 o 3 surface, and with La 2 o 3 react to form La 2 o 2 CO 3 , forming La 2 o 2 CO 3 Species can react with carbon deposition to improve the stability of the catalyst. In addition, La 2 o 2 CO 3 With methane oxidative coupling (OCM) activity, methane can be in La 2 o 2 CO 3 Surface adsorption and dissociation. La 2 o 2 CO 3 There are three crystal forms, including tetrago...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J23/83C01B3/40
CPCB01J23/10B01J23/83B01J35/006B01J35/0073B01J37/0201C01B3/40C01B2203/0227C01B2203/1041C01B2203/1058Y02P20/52
Inventor 巩金龙曾亮赵志坚李昕煜赵九冰桑思尔陈赛
Owner TIANJIN UNIV
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