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Vanadium-based SCR catalyst and preparation method thereof

An SCR catalyst and catalyst technology, applied in the chemical field, can solve problems such as poor hydrothermal durability and catalyst durability, and achieve the effects of ensuring high temperature durability, maintaining hydrothermal durability, and suppressing specific surface area.

Active Publication Date: 2014-12-24
清华大学苏州汽车研究院(吴江) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalyst durability has been a problem due to the poor hydrothermal durability of vanadium oxides

Method used

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  • Vanadium-based SCR catalyst and preparation method thereof
  • Vanadium-based SCR catalyst and preparation method thereof
  • Vanadium-based SCR catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1 is to use anatase type porous titanium dioxide as carrier, after loading ammonium sulfate, load V 2 o 5 and WO 3 catalyst.

[0052] 1.1 Preparation of anatase-type porous titanium dioxide hydrated colloid

[0053] Mix 100 g of titanyl sulfate and 10% sodium hydroxide by mass, titrate into 1 L of ion-exchanged water for 1 hour, and stir to keep the pH value between 2.5 and 3.5. Then, water washing and filtration are repeated to make the pH value reach 5-6, and the obtained coagulation is dried at 180° C. to obtain a hydrated colloid.

[0054] 1.2 Treatment of ammonium sulfate

[0055] Next, 2.5 g of ammonium sulfate was dissolved by adding 43 g of ion-exchanged water, and this ammonium sulfate aqueous solution and 43 g of the above-mentioned titanium dioxide hydrogel were sufficiently kneaded in a magnetic mortar. The kneaded material was degassed in a vacuum furnace at a vacuum pressure of 4 to 7 Torr without heating. Then, it was dried at 120° C., an...

Embodiment 2

[0061] Embodiment 2 is to use the specific surface area with embodiment 1, and the anatase type titanium dioxide that catalyst forms is different is carrier, loads ammonium sulfate, stacks V then 2 o 5 and WO 3 catalyst.

[0062] 2.1 Preparation of anatase-type porous titanium dioxide hydrated colloid

[0063] Mix 100 g of titanyl sulfate and 10% sodium hydroxide by mass, titrate into 1 L of deionized water for 1 hour, and stir to keep the pH value between 2 and 3. Then, washing with water and filtering are repeated to make the pH value reach 5-6, and the obtained gel is dried at 180° C. to obtain the desired xerogel.

[0064] 2.2 Treatment of ammonium sulfate

[0065] Add 43 g of deionized water to 2.5 g of ammonium sulfate to dissolve, and use this aqueous solution of ammonium sulfate, 43 g of the above-mentioned water and colloid, and fully knead in a magnetic mortar. The kneaded material was degassed in a vacuum furnace at a vacuum pressure of 4 to 7 Torr without heat...

Embodiment 3

[0073] Embodiment 3 is to use the specific surface area with embodiment 1, and the anatase type titanium dioxide that catalyst forms is different is carrier, loads ammonium sulfate, stacks V then 2 o 5 and WO 3 catalyst.

[0074] 3.1 Preparation of anatase-type porous titanium dioxide hydrated colloid

[0075] Mix 100 g of titanyl sulfate and 10% sodium hydroxide by mass, titrate it into 1 L of ion-exchanged water for 1 hour, and stir to keep the pH value between 3 and 4. Then, washing with water and filtering are repeated to make the pH value reach 5-6, and the obtained gel is dried at 180° C. to obtain a dry gel.

[0076] 3.2 Treatment of ammonium sulfate

[0077] 2.5 g of ammonium sulfate was dissolved by adding 43 g of ion-exchanged water, and this ammonium sulfate aqueous solution, 43 g of the above-mentioned water and colloid were fully kneaded in a magnetic mortar. The kneaded material was degassed in a vacuum furnace at a vacuum pressure of 4 to 7 Torr without hea...

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Abstract

The invention discloses a vanadium-based SCR catalyst and a preparation method thereof. According to the vanadium-based SCR catalyst, a sulfur-containing oxide is added into anatase type porous titanium dioxide and is mixed and calcined to obtain a porous mixed oxide; and a vanadium oxide and a tungsten oxide are loaded on the surface of the porous mixed oxide to obtain the vanadium-based SCR catalyst, wherein the content of anatase type porous titanium dioxide is 65%-80%, the content of vanadium oxide and tungsten oxide is 17%-30% and the content of the sulfur-containing oxide is 2.0%-5.0%. According to the vanadium-based SCR catalyst, the specific surface area of the catalyst is prevented from being reduced at a high temperature by the sulfur-containing oxide and the vanadium-based SCR catalyst has the hydrothermal durability. The vanadium-based SCR catalyst keeps active when the temperature of tail gas is 250 DEG C and keeps high-temperature durability at 700 DEG C; and the BET specific surface area of the catalyst keeps more than 80% of a previous specific surface area after the catalyst is exposed for 1-12 hours under the conditions that the volume ratio of water steam is less than 10% and the temperature is lower than 700 DEG C.

Description

technical field [0001] The present invention relates to the field of chemical technology, in particular to a method for preparing a catalyst, in particular to a non-structural porous oxide SCR catalyst (hereinafter referred to as SCR catalyst) and its preparation method, not only limited to products, but also related to As well as an SCR catalyst and a preparation method related to the purification of tail gas. Background technique [0002] Combustion of fossil fuels at high temperatures in the air can easily lead to nitrogen oxides (NO X )Formation. Regarding how to prevent the formation of such pollutants, people have done a lot of experimental research and efforts to eliminate harmful substances in the air. At the same time, the environmental regulations of various countries have become more stringent on the emission of nitrogen oxides in the atmosphere. [0003] A method for reducing nitrogen oxides is disclosed in U.S. patent document US4 085 193. Component A is tita...

Claims

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Application Information

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IPC IPC(8): B01J27/047B01D53/94B01D53/56
CPCB01D53/8628B01J27/053B01D2258/01B01J35/613
Inventor 帅石金胡准华伦赵彦光朱君君潘金冲松冈宽
Owner 清华大学苏州汽车研究院(吴江)
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