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Preparation method of perovskite-like La*NiO* and applications

A technology of perovskite and species, applied in chemical instruments and methods, catalyst activation/preparation, inorganic chemistry, etc., can solve the non-uniform composition and structure, adjust the uniformity and fineness of the calcined precursor mixture, and affect the performance of calcined products. and other problems, to achieve the effect of uniform particle size and uniform composition

Inactive Publication Date: 2009-10-28
TIANJIN BOHAI VOCATIONAL TECHN COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the improved synthesis methods reported in the literature mainly include sol-gel method, co-precipitation method, hydrothermal synthesis method, etc., but because the above synthesis methods still use the mixture as the raw material of the roasted precursor, the mixture of the roasted precursor is homogeneous. The degree and fineness cannot be adjusted to a large extent from the microscopic level, resulting in uneven composition and structure in the product, which in turn affects the performance of the roasted product

Method used

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  • Preparation method of perovskite-like La*NiO* and applications
  • Preparation method of perovskite-like La*NiO* and applications
  • Preparation method of perovskite-like La*NiO* and applications

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Effect test

Embodiment 1

[0026] Embodiment 1: raw material is La (AC) 3 ·5H 2 O, Ni(AC) 2 4H 2 O, the prepared soluble salt concentration is 0.10mol / L, according to La(NO 3 ) 3 ·6H 2 O:Ni(NO 3 ) 2 ·6H 2 The molar ratio of O is 2:1 and the two salt solutions are mixed. Take citric acid as complexing agent, concentration is 0.10mol / L, get 500ml complexing agent, according to La(NO 3 ) 3 ·6H 2 O:Ni(NO 3 ) 2 ·6H 2 The molar ratio of O: citric acid is 2:1:3. Add the metal salt solution dropwise to the complexing agent, and perform ultrasonic vibration treatment to form a sol; heat in a water bath at 60°C, stir the sol until it gels; dry at 90°C The product precursor was formed in 10 hours, the product precursor was placed in a microwave synthesis furnace, and treated at 600 ° C for 120 minutes, and the obtained perovskite-like oxide was reduced with hydrogen at 500 ° C for 3 hours to obtain a perovskite-like oxide. Perovskite catalyst La 2 NiO 4 .

Embodiment 2

[0027]Embodiment 2: raw material is La (Cl) 2 ·6H 2 O, Ni(Cl) 2 ·6H 2 O, the prepared soluble salt concentration is 0.10mol / L, according to La(NO 3 ) 3 ·6H 2 O:Ni(NO 3 ) 2 ·6H 2 The molar ratio of O is 2:1 and the two salt solutions are mixed. Take citric acid as complexing agent, concentration is 0.10mol / L, get 500ml complexing agent, according to La(NO 3 ) 3 ·6H 2 O:Ni(NO 3 ) 2 ·6H 2 The molar ratio of O: citric acid is 2:1:3. Add the metal salt solution dropwise to the complexing agent, and perform ultrasonic vibration treatment to form a sol; heat in a water bath at 60°C, stir the sol until it gels; dry at 90°C The product precursor was formed in 10 hours, the product precursor was placed in a microwave synthesis furnace, and treated at 600 ° C for 120 minutes, and the obtained perovskite-like oxide was reduced with hydrogen at 500 ° C for 3 hours to obtain a perovskite-like oxide. Perovskite catalyst La 2 NiO 4 .

Embodiment 3

[0028] Embodiment 3: raw material is La (NO 3 ) 3 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O, the prepared soluble salt concentration is 0.10mol / L, according to La(NO 3 ) 3 ·6H 2 O:Ni(NO 3 ) 2 ·6H 2 The molar ratio of O is 2:1 and the two salt solutions are mixed. Take citric acid as complexing agent, concentration is 0.10mol / L, get 500ml complexing agent, according to La(NO 3 ) 3 ·6H 2 O:Ni(NO 3 ) 2 ·6H 2 The molar ratio of O: citric acid is 2:1:3. Add the metal salt solution dropwise to the complexing agent, and perform ultrasonic vibration treatment to form a sol; heat in a water bath at 60°C, stir the sol until it gels; dry at 90°C The product precursor was formed in 10 hours, the product precursor was placed in a microwave synthesis furnace, and treated at 600 ° C for 120 minutes, and the obtained perovskite-like oxide was reduced with hydrogen at 500 ° C for 3 hours to obtain a perovskite-like oxide. Perovskite catalyst La 2 NiO 4 .

[0029] From figure 1 (a) XRD ...

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Abstract

The invention relates to a preparation method of perovskite-like La2NiO4 catalyst and applications. The method includes the specific steps of: taking the soluble metal salts of La, Ni as raw materials to formulate a soluble metal salt solution with the concentration of 0.1-0.3mol / L; using citric acid with the concentration of 0.1-0.3mol / L as complexing agent; dripping the metal salt solution to the complexing agent according to the mol ratio of La:Ni: citric acid being 2:1:2-2:1:4 and implementing ultrasonic oscillation treatment to form sol; heating and stirring the sol in water bath with the temperature of 60-90 DEG C to be gelated; and drying the gelated sol at the temperature of 90-150 DEG C for 10-30h to form a product precursor; arranging the product precursor in a microwave synthesis furnace; and treating the product precursor at the temperature of 600-1000 DEG C for 30-180min and reducing the obtained product. When the La2NiO4 catalyst prepared by the method is applied to hydrogen production by ethanol vapor reforming, the characteristics of even components and uniform grain diameter are available.

Description

technical field [0001] The present invention relates to a preparation method and application of a catalyst, in particular to a perovskite-like La 2 NiO 4 Catalyst preparation methods and applications. Background technique [0002] In the past 20 to 30 years, in order to solve the problem of sustainable development of energy and environment, coupled with the depletion of fossil fuels, the development and utilization of clean renewable energy has attracted much attention. As a clean energy, hydrogen is attracting more and more attention. [0003] Hydrogen is an efficient, clean and renewable energy, which will play a significant role in the sustainable development of the global energy system. Compared with other energetic substances, hydrogen has a series of outstanding advantages. The energy density of hydrogen is high, 2.68 times that of ordinary gasoline; the thermal efficiency of converting hydrogen into power is 30-60% higher than that of conventional fossil fuels, an...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J37/34B01J37/16B01J37/18B01J37/08C01B3/32
Inventor 张利峰申奕王蕾
Owner TIANJIN BOHAI VOCATIONAL TECHN COLLEGE
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