Cobalt-loaded lanthanum, manganese, calcium and titanium ore type nitric oxide oxidation catalyst and preparation method

An oxidation catalyst, perovskite-type technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as high price, achieve low cost, simple craftsmanship

Active Publication Date: 2016-02-03
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although noble metal catalysts are highly active, they are expensive, while metal oxide catalysts overcome this shortcoming and have good catalytic oxidation activity.

Method used

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  • Cobalt-loaded lanthanum, manganese, calcium and titanium ore type nitric oxide oxidation catalyst and preparation method
  • Cobalt-loaded lanthanum, manganese, calcium and titanium ore type nitric oxide oxidation catalyst and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put 2.27g of lanthanum nitrate, 1.30g of cerium nitrate, and 3.57g of 50wt% manganese nitrate into deionized water, fully dissolve and heat up to 80°C, add 4.62g of citric acid while stirring, and continue stirring until the water evaporates to produce a viscous Colloid, put the obtained colloid into an oven at 110°C to dry for 12 hours, take it out and grind it finely, and bake it at 700°C for 5 hours to obtain La 0.7 Ce 0.3 MnO 3 black powder. Weigh 0.247 g of cobalt nitrate and dissolve it in 1.50 ml of deionized water, then weigh 0.500 g of black powder and put it into the cobalt solution, let it stand for 10 hours, put it in an oven at 70°C for 12 hours, and then bake it at 500°C for 5 hours. According to X-ray powder diffraction, the powder is 10%Co / La 0.7 Ce 0.3 MnO 3 Catalysts such as figure 1 shown.

Embodiment 2

[0021] Compared with Example 1, the difference is that the quality of cobalt nitrate is 0.123 grams, and the amount of other materials and operating conditions are the same as in Example 1 to obtain 5%Co / La 0.7 Ce 0.3 MnO 3 catalyst.

Embodiment 3

[0023] Compared with Example 1, the difference is that the quality of cobalt nitrate is 0.494 grams, and other material consumption and operating conditions are the same as in Example 1 to obtain 2.5%Co / La 0.7 Ce 0.3 MnO 3 catalyst.

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Abstract

The invention discloses a cobalt-loaded lanthanum, manganese, calcium and titanium ore type nitric oxide oxidation catalyst and a preparation method. The molecular formula is xCo/La1-yCeyMnO3, wherein x is larger than or equal to 2.5% and smaller than or equal to 20%, x is the mass fraction, y is larger than or equal to 0.1 and smaller than or equal to 0.3, and y is the mole number. Rare earth metal cerium is doped with lanthanum, manganese, calcium and titanium ore to serve as active components and carriers of the catalyst, another active component cobalt is additionally added, the conversion rate of nitric oxide catalytic oxidation can reach 85% or above, and the process used for preparing the catalyst is simple, cost is low and industrialized production can be easily achieved.

Description

technical field [0001] The invention relates to the preparation of a cobalt-loaded lanthanum manganese perovskite catalyst and its application in the catalytic oxidation of nitrogen monoxide, and has application prospects in the field of environmental purification. Background technique [0002] Catalytic oxidation of nitric oxide (NO) to nitrogen dioxide (NO 2 ), NO 2 As an important intermediate product, it plays a very critical role in the catalytic reaction. First, NO is oxidized to NO 2 It is the first key reaction of nitrogen oxide storage reduction (NSR) technology, and NO oxidation will provide strong support for the storage and subsequent reduction of nitrogen oxides. Secondly, in the temperature range of 200-300 °C, the reaction rate of selective catalytic reduction (SCR) technology increases with the NO in the atmosphere 2 concentration increases, adjust the NO in the atmosphere 2 The content of is particularly important for the SCR response. Finally, NO 2 A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889
Inventor 何丹农杨玲高振源蔡婷袁静张涛赵昆峰金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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