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Process for preparing nanocrystalline mixed metal oxides and nanocrystalline mixed metal oxides obtained using the process

A nanocrystal, mixed metal technology, applied in metal/metal oxide/metal hydroxide catalysts, oxygen/ozone/oxide/hydroxide, chemical instruments and methods, etc. Crystal particles unfavorable agglomeration and other problems, to achieve the effect of enhanced reactivity, increased BET surface area, conversion rate and selectivity improvement

Inactive Publication Date: 2009-08-19
SUD CHEM IP GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] The prior art methods described above have disadvantages related in particular to the presence of very broad particle size distributions of the nanocrystals, unfavorable agglomeration between nanocrystal particles, and incomplete phase transitions, i.e., at the final Often only 40% to 70% of the desired end product is obtained in the product, which requires additional purification steps or recrystallization

Method used

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  • Process for preparing nanocrystalline mixed metal oxides and nanocrystalline mixed metal oxides obtained using the process
  • Process for preparing nanocrystalline mixed metal oxides and nanocrystalline mixed metal oxides obtained using the process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] LaMnO 3 preparation of

[0063] 2.5112g Mn(NO 3 ) 2 4H 2 O and 4.3302g La(NO 3 ) 2 ·6H 2 O and 4.2028 g of citric acid were dissolved together in 30 ml of water at a temperature of 80°C and slowly reheated to 150°C.

[0064] The resulting viscous solution was then introduced in atomized form through a Schenk distributor into the previously described reactor. The residence time of the solution in the reactor was about 700 milliseconds. The temperature was set at 270°C.

[0065] Then 6.1g LaMnO 3 (corresponding to 95% yield) was removed from the reactor with a BET surface area of ​​175m 2 / g.

Embodiment 2

[0067] La 0.5 Sr 0.5 MnO 3 preparation of

[0068] 1.07g Sr(NO 3 ) 2 , 2.60g Mn(NO 3 )·4H 2 O, 2.22g La(NO 3 ) 2 ·6H 2 O and 4.20g of citric acid were dissolved in 30ml of water at 80°C.

[0069] The solution was introduced into the reactor as in Example 1 via a Schenk distributor. The residence time of the powder in the reactor was likewise about 700 milliseconds, and the temperature of the reactor was 200°C. La 0.5 Sr 0.5 MnO 3 The yield of 4.5g, BET surface area is 185m 2 / g.

Embodiment 3

[0071] In the process of oxidizing CO, the La obtained in Example 2 0.5 Sr 0.5 MnO 3 Compared with La prepared by hydroxide precipitation method and subsequent calcination 0.5 Sr 0.5 MnO 3 Do a test comparison.

[0072] In each case 100 mg La 0.5 Sr 0.5 MnO 3 Mixed with 500mg of silica sand, the flow rate allowed for the reaction is 35ml per minute (the CO in the synthesis gas is 802ppm). Powder is not activated.

[0073] figure 1 It is shown that at a temperature of 150° C. the conversion of CO has reached about 66%. Complete conversion of CO has been achieved at a temperature of 200 °C.

[0074] on the contrary, figure 2 shows the use of La obtained by the hydroxide method 0.5 Sr 0.5 MnO 3 CO conversion of the two samples.

[0075] As shown by the curve of sample 1, a CO conversion of about 13% was observed at a temperature of 150 °C. At a temperature of about 200°C, 90% of CO is converted, and only at a temperature of 250°C is 100% conversion obtained.

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Abstract

The present invention relates to a process for preparing nanocrystalline mixed metal oxide particles from at least two different starting compounds, comprising the steps of a) introducing a stoichiometric mixture of the starting compounds into a reaction chamber by means of a carrier fluid, b) subjecting the starting compound in a treatment zone under a pulse in the reaction chamber under a pulsating thermal treatment, c) forming nanocrystalline mixed metal oxide particles, d) discharging the nanocrystalline mixed metal oxide particles obtained in step b) to c) from the reactor, the stoichiometric mixing of the starting compounds taking place at a temperature of > 50 DEG C. The present invention further relates to a nanocrystalline mixed metal oxide, intended more particularly for use as a catalyst, which is obtainable through the process of the invention.

Description

technical field [0001] The invention relates to a process for the preparation of nanocrystalline mixed metal oxides, nanocrystalline mixed metal oxides prepared according to the process according to the invention and their use as catalysts, in particular in the production of methanol from carbon monoxide and hydrogen and in the oxidation of carbon monoxide use as a catalyst in the process. Background technique [0002] Metal oxides, especially mixed metal oxides, have more applications than ever before, especially in ceramics, polymer additives, fillers, pigments, reactive surfaces and catalysts, among others. [0003] In addition, for example, copper oxide having a perovskite structure shows a phase transition at surprisingly high temperatures to become a superconductor, and thus has been the subject of numerous studies. This applies especially to lanthanum-strontium cuprates such as La 2-x Sr x CuO 4 or yttrium-barium cuprate, such as YBa 2 Cu 3 o 7-Δ . [0004] Ty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B13/34C01G45/00B01J23/34
CPCC01B13/34B01J35/006C01P2002/36C01P2002/32B01J23/002C01G45/1264C01P2004/61C01P2006/12B01J37/031C01P2002/34C01P2002/30C01P2004/64B01J35/1019C01P2004/52C01P2004/62B01J23/005B82Y30/00B01J2523/00Y10T428/2982Y10T428/2991B01J2523/3706B01J2523/72B01J2523/24
Inventor 汉斯-约尔格·沃克
Owner SUD CHEM IP GMBH & CO KG
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