Preparation method of Mn-Ti oxide system low-temperature selective catalytic reduction (SCR) catalyst

A selective and oxidizing technology, applied in the field of physical chemistry, can solve the problems of increasing denitration costs, shortening catalyst life, increasing investment costs, etc.

Active Publication Date: 2012-12-19
WUHAN IRON & STEEL ENG TECH GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to avoid reheating the flue gas, the SCR device must be placed before the desulfurization and dust removal, but in this way, the SO in the flue gas 2 and dust will cause different degrees of catalyst deactivation, which shortens the life of the catalyst; although the SCR device is placed behind the desulfurization and dust removal device, the catalyst life can be extended, but since the temperature of the flue gas after desulfurization and dust removal is generally lower than 433K, the flue g

Method used

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  • Preparation method of Mn-Ti oxide system low-temperature selective catalytic reduction (SCR) catalyst

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Effect test

Embodiment 1

[0018] A kind of preparation method of Mn-Ti oxide system low-temperature selective catalytic reduction catalyst, its specific steps are as follows:

[0019] (1) Under stirring conditions, add n-butyl titanate to acrylic acid (AA) and mix well; then add chemically pure manganese nitrate, wherein the molar ratio of n-butyl titanate, manganese nitrate and acrylic acid is 10:3 : 26; Then add ethanol, stir to form a homogeneous solution;

[0020] (2) Nitrogen is passed to remove the oxygen in the solution system, and then (NH 4 ) 2 S 2 o 8 The initiator, after mixing evenly, is placed in an oven to polymerize at a temperature of 80°C to obtain a solid polyacrylate;

[0021] (3) Dry the solid polyacrylate at 200° C. for 24 hours to obtain a polymer precursor.

[0022] (4) After the polymer precursor was pyrolyzed at 800 °C for 5 hours in an air atmosphere, it was ground to obtain the low-temperature selective catalytic reduction catalyst of the Mn-Ti oxide system, that is, the...

Embodiment 2

[0024] A kind of preparation method of Mn-Ti oxide system low-temperature selective catalytic reduction catalyst, its specific steps are as follows:

[0025] (1) Under stirring conditions, add n-butyl titanate to acrylic acid (AA) and mix well; then add chemically pure manganese nitrate, wherein the molar ratio of n-butyl titanate, manganese nitrate and acrylic acid is 5:2 : 21; Then add ethanol and water, stir to form a homogeneous solution;

[0026] (2) Nitrogen is passed to remove the oxygen in the solution system, and then (NH 4 ) 2 S 2 o 8 The initiator, after mixing evenly, is placed in an oven to polymerize at a temperature of 80°C to obtain a solid polyacrylate;

[0027] (3) Dry the solid polyacrylate at 220° C. for 24 hours to obtain a polymer precursor.

[0028] (4) The polymer precursor was pyrolyzed at 700°C for 6 hours in an air atmosphere, and then ground to obtain Mn-Ti oxide powder.

[0029] From the scanning electron micrograph of the final Mn-Ti oxide p...

Embodiment 3

[0031] A kind of preparation method of Mn-Ti oxide system low-temperature selective catalytic reduction catalyst, its specific steps are as follows:

[0032] (1) Under stirring conditions, add n-butyl titanate to acrylic acid (AA) and mix well; then add chemically pure manganese nitrate, wherein the molar ratio of n-butyl titanate, manganese nitrate and acrylic acid is 2:1 : 12; Then add Virahol and water, stir to form a homogeneous solution;

[0033] (2) Nitrogen is passed to remove the oxygen in the solution system, and then (NH 4 ) 2 S 2 o 8 The initiator, after mixing evenly, is placed in an oven to polymerize at a temperature of 80°C to obtain a solid polyacrylate;

[0034] (3) Dry the solid polyacrylate at 240° C. for 36 hours to obtain a polymer precursor.

[0035] (4) The polymer precursor was pyrolyzed at 600°C for 8 hours in an air atmosphere and ground to obtain Mn-Ti oxide powder.

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Abstract

The invention discloses a preparation method of a Mn-Ti oxide system low-temperature selective catalytic reduction (SCR) catalyst. The preparation method comprises the following steps of: in a stirring condition, adding titanium tetrabutoxide in acrylic acid to uniformly mix, adding manganous nitrate and a solvent, and stirring a mixture to form a homogeneous phase solution, wherein a mol ratio of the titanium tetrabutoxide to the manganous nitrate ranges from 10: 1 to 10: 6, and a mol ratio of sum of the titanium tetrabutoxide and the manganous nitrate to the acrylic acid ranges from 1: 5 to 1: 1; deoxidizing by introducing nitrogen, and adding an initiator to polymerize, so as to obtain solid polyacrylate; and drying and carrying out pyrolysis on the solid polyacrylate, and then grinding to obtain Mn-Ti oxide powder. The preparation method provided by the invention has the advantages of easiness of control and convenience in implementation; metal ions in a prepared polymer precursor can be horizontally and uniformly mixed in an ion level; the grain size of the Mn-Ti oxide powder prepared by sintering the polymer precursor can reach a nanometer level and a narrow distribution range so that the Mn-Ti oxide system low-temperature SCR catalyst has a better application prospect in a low-temperature smoke SCR denitration reaction catalyst field.

Description

technical field [0001] The invention belongs to the field of physical chemistry, and in particular relates to a preparation method of a Mn-Ti oxide system low-temperature selective catalytic reduction catalyst. Background technique [0002] Stationary sources of nitrogen oxides (NO x ) treatment methods, the Selective Catalytic Reduction (SCR) method has become the mainstream technology for flue gas denitrification in thermal power plants because of its high efficiency and cost-effectiveness. However, the currently used selective catalytic reduction of NO x The V-W-Ti series catalysts require a higher reaction temperature, which is generally required to be controlled at 573~673K. In order to avoid reheating the flue gas, the SCR device must be placed before the desulfurization and dust removal, but in this way, the SO in the flue gas 2 and dust will cause different degrees of catalyst deactivation, which shortens the life of the catalyst; although the SCR device is placed...

Claims

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Application Information

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IPC IPC(8): B01J23/34
Inventor 余丽红孔德友郑瑜黄诚宋捷陈倩倩方园
Owner WUHAN IRON & STEEL ENG TECH GROUP
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