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Method for preparing special-shaped lanthanum cuprate (La2CuO4) powder bodies by sol-gel method

A gel method, lanthanum cuprate technology, applied in chemical instruments and methods, copper compounds, inorganic chemistry, etc., can solve the problems of fast reaction process, long reaction period, and easy sintering of products.

Active Publication Date: 2012-06-20
山东格新精工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these methods have their own shortcomings. For example, in order to obtain a high-purity target product in the solid-state reaction method, the reactant powder should be fine enough, and it needs to be roasted at high temperature for a long time and repeatedly ground, which is time-consuming. , and there are more impurity phases in the product; for the self-propagating combustion method, the combustion reaction is very violent, the combustion temperature is high, the reaction process is fast, it is not easy to control, the product is easy to sinter, and there is a high possibility of non-equilibrium phase in the product Or metastable phase; for the hydrothermal method, the technical difficulty is high (strict temperature and pressure control), high equipment requirements (high temperature and high pressure resistant steel, corrosion resistant lining), poor safety performance, and long reaction cycle

Method used

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  • Method for preparing special-shaped lanthanum cuprate (La2CuO4) powder bodies by sol-gel method
  • Method for preparing special-shaped lanthanum cuprate (La2CuO4) powder bodies by sol-gel method

Examples

Experimental program
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Effect test

Embodiment 1

[0018] 1) Analytical pure lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) and copper nitrate (Cu(NO 3 ) 3 ·3H 2 O) dissolve with deionized water, be mixed with the solution A that total metal ion concentration is 0.5mol / L;

[0019] 2) Add glycine to solution A at a molar ratio of 1.2:1 to the sum of glycine and metal ions, and then add lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) and copper nitrate (Cu(NO 3 ) 3 ·3H 2 The total mass of O is 2% stearic acid as a dispersant, and urea is used to adjust pH=2.5, and stirred at a constant temperature of 80° C. to form a blue transparent solution B;

[0020] 3) The sol formed after the solution B was left to age for 10 hours was placed in a blast drying oven and dried at a constant temperature of 90°C to obtain a xerogel;

[0021] 4) Grind the dry gel into powder with a mortar, put it into a muffle furnace, raise the temperature from room temperature to 650 °C at a rate of 5 °C / min, keep it warm for 3 hours, cool down to room temperatur...

Embodiment 2

[0024] 1) Analytical pure lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) and copper nitrate (Cu(NO 3 ) 3 ·3H 2 O) dissolve with deionized water, be mixed with the solution A that total metal ion concentration is 1mol / L;

[0025] 2) According to the molar ratio of the sum of glycine and metal ions being 2:1, add glycine to solution A and then add lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) and copper nitrate (Cu(NO 3 ) 3 ·3H 2 The total mass of O is 3% of the dispersant EDTA, and urea is used to adjust the pH=3, and it is stirred at a constant temperature of 80° C. to form a blue transparent solution B;

[0026] 3) The sol formed after the solution B was left to age for 15 hours was placed in a blast drying oven and dried at a constant temperature of 100°C to obtain a xerogel;

[0027] 4) Grind the dry gel into powder with a mortar, put it into a muffle furnace, raise the temperature from room temperature to 700 °C at a rate of 5 °C / min, keep it warm for 2 hours, cool to room tem...

Embodiment 3

[0029] 1) Analytical pure lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) and copper nitrate (Cu(NO 3 ) 3 ·3H 2 O) dissolve with deionized water, be mixed with the solution A that total metal ion concentration is 1.5mol / L;

[0030] 2) Add glycine to solution A at a molar ratio of 0.8:1 to the sum of glycine and metal ions, and then add lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) and copper nitrate (Cu(NO 3 ) 3 ·3H 2 The total mass of O is 6% dispersant oxalic acid, and the pH is adjusted to 1.5 with urea, and stirred at a constant temperature of 50 ° C to form a blue transparent solution B;

[0031] 3) The sol formed after the solution B was allowed to stand and age for 2 hours was placed in a blast drying oven and dried at a constant temperature of 70°C to obtain a xerogel;

[0032] 4) Grind the dry gel into powder with a mortar, put it into a muffle furnace, raise the temperature from room temperature to 500 °C at a rate of 5 °C / min, keep it warm for 6 hours, cool down to roo...

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Abstract

The invention relates to a method for preparing special-shaped lanthanum cuprate (La2CuO4) powder bodies by a sol-gel method. The method comprises the steps of: dissolving lanthanum nitrate and copper nitrate by de-ionized water to obtain a solution A; sequentially adding glycine and dispersants into the solution A, and adjusting the pH to be 1.5 to 4.5 with urea to obtain a solution B; standing, aging and drying the solution B to obtain dry gel; and grinding the dry gel into powders by a mortar, placing into a muffle furnace for calcining and grinding into powder to obtain the special-shaped La2CuO4 powder bodies. According to the method, the special-shaped La2CuO4 powder bodies are prepared by using the sol-gel method; EDTA (Ethylene Diamine Tetraacetic Acid), stearic acid and oxalic acid are used as dispersants respectively, so that the needle-like, rod-like and spindle-like La2CuO4 powder bodies can be obtained; the prepared La2CuO4 has the advantages of good crystallization, complete shape, good repeatability and low reaction temperature, so that the energy consumption is greatly reduced, the cost is saved; and the method is simple to operate and is suitable for large scale production.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a sol-gel method for preparing lanthanum cuprate (La 2 CuO 4 ) powder method. Background technique [0002] Because of its low carbon content, natural gas produces greenhouse gas CO when burned. 2 The amount is less, becoming a more ideal fuel. However, high temperature combustion of natural gas produces a large amount of NO X , discharged into the atmosphere will seriously pollute the environment. With the help of the catalyst, natural gas can be burned at a lower temperature, thereby avoiding the N in the air due to high temperature 2 Oxidation to NO X , to achieve high-efficiency combustion of natural gas and ultra-low emission processes. Therefore, catalytic oxidation is an environmentally friendly green technology with good application prospects. The traditional catalysts used for methane oxidation are supported noble metals. Although they have excellent low-tempe...

Claims

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Application Information

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IPC IPC(8): C01G3/00B01J23/83
Inventor 黄剑锋李意峰孙莹曹丽云吴建鹏
Owner 山东格新精工有限公司
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