Low-temperature denitration catalyst for smoke and preparation method thereof

A low-temperature denitrification and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of narrow operating temperature window, high catalyst cost, easy sintering of catalyst, etc., and achieve good low-temperature activity, high The effect of specific surface area and strong anti-sintering ability

Inactive Publication Date: 2013-06-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Noble metal catalysts have good catalytic activity at low temperatures, but due to the high cost of catalysts, narrow operating temperature window, easy sintering of catalysts, and poor stability, currently low-temperature NH 3 -Research on SCR catalysts mainly focuses on transition metal oxide catalysts

Method used

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  • Low-temperature denitration catalyst for smoke and preparation method thereof
  • Low-temperature denitration catalyst for smoke and preparation method thereof
  • Low-temperature denitration catalyst for smoke and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 1g SiO 2 (The specific surface is about 200 m 2 / g) was dispersed in 200 mL of absolute ethanol, and 2 mL of deionized water was added. 50 mL of 4.6667 g / L citric acid ethanol solution was added dropwise to the system, and the adsorption was stirred at 30 °C for 3 h. Then 50 mL of manganese acetate ethanol solution with a concentration of 8.1667 g / L was added dropwise to the system, and reacted at 30 °C for 3 h. After fully reacting, the catalyst precursor was obtained, and after suction filtration and drying, the sample was roasted in a muffle furnace at 400 °C for 5 h to obtain the catalyst. XRD analysis showed that the supported MnOx in the catalyst was Mn 3 o 4 exists in the form of (such as figure 1 shown), the TEM test results show that the catalyst prepared by this method has good dispersion (such as figure 2 shown), the catalyst is applied to flue gas denitrification, and the conversion rate of NO can reach 80% at 180 °C, and can reach more than 90% ...

Embodiment 2

[0023] Take 0.2g SiO 2 Disperse in 200 mL of anhydrous methanol and add 0.2 mL of deionized water. 50 ml of 5.3333 g / L methanolic NaOH solution was added dropwise to the system, and stirred and adsorbed at 30 °C for 3 h. 50 mL of manganese nitrate methanol solution with a concentration of 23.8095 g / L was added dropwise to the system, and reacted at 30 °C for 3 h. After fully reacting, the catalyst precursor was obtained, and after suction filtration and drying, the sample was roasted in a muffle furnace at 300 °C for 5 h to obtain the catalyst. When this catalyst is applied to flue gas denitrification, the conversion rate of NO can reach 70% at 160 °C and more than 80% at 200 °C.

Embodiment 3

[0025] Take 1g SiO 2 Disperse in 200 mL of anhydrous propanol, add 1 mL of deionized water. 50 mL of 12 g / L oxalic acid in propanol was added dropwise to the system, and the adsorption was stirred at -5 °C for 24 h. 50 mL of 26.4 g / L manganese chloride propanol solution was added dropwise to the system, and reacted at -5 °C for 3 h. After fully reacting, the catalyst precursor was obtained. After suction filtration and drying, the sample was roasted in a muffle furnace at 700 °C for 5 h to obtain the catalyst. When this catalyst is applied to flue gas denitrification, the conversion rate of NO can reach 55% at 160 °C and more than 60% at 200 °C.

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Abstract

The invention discloses a low-temperature denitration catalyst for smoke and a preparation method thereof. The catalyst uses an oxide of manganese as an active component and uses silica as a carrier. The preparation method comprises the following steps of: 1) preparing a low alcohol solution of which the water volume fraction is 0.1%-20%, orderly adding 0.1-25 g of SiO2 into every 100 mL of low alcohol solution under a stirring condition, and fully and uniformly mixing the solution; and 2) respectively preparing an alcohol solution of inorganic alkaline or organic acid of which the concentration is 1-300 g / L, and alcohol solution of Mn salt of which the concentration is 1-300 g / L, and dripping the alcohol solution into the reaction system obtained in the step 1), reacting for 10 min-10 hours at -5-70 DEG C, filtering, drying, and baking, thereby obtaining the catalyst. The catalyst disclosed by the invention can be used for denitration of smoke and has good removal activity of NO in the smoke.

Description

technical field [0001] The invention discloses a preparation method of a nanometer Mn-based catalyst with silica gel as a carrier. Background technique [0002] Nitrogen oxides (NOx) are one of the main air pollutants, not only harmful to human health, but also an important precursor of secondary pollution such as ozone, fine particles and acid deposition, so effective control of NOx emissions is a top priority. Among various technologies to solve NOx emissions, NH 3 Selective catalytic reduction of NOx (NH 3 -SCR) is currently the most effective and widely used flue gas denitrification technology in the world. NH 3 -The core of SCR technology is the catalyst, the current commercial catalyst is WO 3 or MoO 3 Modified V 2 o 5 / TiO 2 (Anatase) Catalyst (V 2 o 5 mass fraction is generally less than 1%), these catalysts are very effective at relatively high operating temperatures (300 - 400 °C), however at temperatures below 200 °C the catalytic activity is in industri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56
Inventor 蒋新高琳心吴忠标
Owner ZHEJIANG UNIV
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