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Preparation method for low-temperature V-W-TiO2 based selective reduction catalyst

A selective and catalytic technology, applied in the field of preparation of low-temperature V-W-TiO2-based selective reduction catalysts, can solve the problems of poor low-temperature activity of the catalyst, and achieve the effects of good low-temperature activity, promoting dispersibility, and improving oxygen storage capacity

Inactive Publication Date: 2017-04-26
凯龙蓝烽新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a low-temperature V-W-TiO 2 Based on the preparation method of selective reduction catalyst (SCR), to overcome the poor shortcoming of catalyst low temperature activity in the prior art

Method used

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  • Preparation method for low-temperature V-W-TiO2 based selective reduction catalyst
  • Preparation method for low-temperature V-W-TiO2 based selective reduction catalyst
  • Preparation method for low-temperature V-W-TiO2 based selective reduction catalyst

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preparation example Construction

[0026] A low temperature type V-W-TiO 2 The preparation method of base selective reduction catalyst comprises the following steps:

[0027] 1) According to TiO 2 Calculate the weight of the solution required for equal-volume immersion, weigh ammonium metatungstate, cerium nitrate and zirconium acetate and add them to deionized water, and form ammonium metatungstate solution and cerium-zirconium aqueous solution after completely dissolving;

[0028] 2) According to W-TiO 2 Calculate the weight of the solution required for equal-volume immersion, weigh ammonium metavanadate and add it to deionized water, add 98% mass fraction of oxalic acid powder after heating and dissolving, and form ammonium metavanadate solution after stirring for a period of time;

[0029] In the kneader, slowly add the ammonium metatungstate aqueous solution prepared in the above step 1) to TiO 2 Knead evenly;

[0030] 4) Slowly add the cerium-zirconium aqueous solution prepared in the above-mentioned ...

Embodiment 7

[0041] The preparation method of silica sol described in embodiment 7 is:

[0042] 1. Preparation of active silicic acid: add water to industrial sodium silicate with a modulus of 2.2 to prepare an aqueous solution of sodium silicate with a silicon dioxide content of 6wt%, add it to a reaction tank, and stir at a speed of 120 rpm; Sulfuric acid is added with water to prepare a 10wt% sulfuric acid solution, which is added to the above-mentioned sodium silicate aqueous solution at a rate of 450ml / min until the pH is 9.2, and the temperature is raised to 95°C for 1 hour to obtain a silica sol bottom liquid; the industrial silicon with a modulus of 3.2 Sodium silicate is added with water to prepare a sodium silicate aqueous solution of 7wt% of silicon dioxide, and ion exchange is carried out by using a strongly acidic cation exchange resin, and the pH value after the exchange is controlled to be 2.5 to obtain silicic acid;

[0043] 2. Growth of colloidal particles: add the above-p...

Embodiment 8

[0046] The preparation method of silica sol described in embodiment 8 is:

[0047] 1. Activation of silicon powder: Weigh 50 parts of 200-mesh silicon powder and add it to 1000 parts of deionized water and soak it in hot water for 30 minutes to activate it to obtain a thin paste solution.

[0048] 2. Hydration reaction: Add the above dilute paste solution into the reaction tank containing 5 parts of 25% ammonia water and 50 parts of industrial sodium silicate aqueous solution with a modulus of 2.5 in 3 times, at a speed of 120 rpm Stir and heat, react at 90°C for 8h.

[0049] 3. Suction filtration: remove unreacted silicon powder by suction filtration to obtain silica sol;

[0050] 4. Surface modification: Add 5 parts of aminopropyltrimethoxysilane to the silica sol prepared above for surface modification, and adjust the pH value of the silica sol to 9.5 with ammonia water. The average particle size of the silica sol is 23nm, the concentration is 40%, the viscosity is 15cps,...

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Abstract

The invention discloses a preparation method for a low-temperature V-W-TiO2 based selective reduction catalyst. The method comprises the following steps of weighing ammonium metatungstate, ammonium metavanadate, cerous nitrate, oxalic acid powder, zirconium acetate and de-ionized water; performing kneading, drying, grinding and roasting to obtain V-Ce-Zr-W-TiO2 powder; mixing the V-Ce-Zr-W-TiO2 powder, silica sol and the de-ionized water; performing ball-milling, dipping and drying; and finally performing roasting to obtain the catalyst. According to the method, the addition of the cerous nitrate facilitates the dispersion of WO3 and improves the oxygen storage capacity of the catalyst; the addition of the zirconium acetate improves the effect of CeO2; and the synergistic effect of CeO2-ZrO2 and WO3 can facilitate the dispersity of V2O5 on the surface of TiO2, so that the prepared V-W-TiO2 based selective reduction catalyst has the advantages that the low-temperature activity is good, the initiation temperature is lower than 190 DEG C, and the like, and is especially suitable for purification of NOx in diesel exhaust gas.

Description

technical field [0001] The invention relates to the technical field of diesel vehicle exhaust purification, in particular to a low-temperature V-W-TiO 2 A method for the preparation of selective reduction catalysts. Background technique [0002] Along with the continuous progress of society, the pace of sustainable economic and technological development, my country's motor vehicle industry has also been able to continue to develop and grow in recent years, and its production, sales and inventory of motor vehicles have continued to grow rapidly. Diesel engines Compared with gasoline engines, it has significant advantages such as strong power, good fuel economy, and high thermal efficiency. Its distribution market has expanded from the transportation field to other industries, and its proportion is increasing. However, the substantial increase in the proportion of diesel engines has also brought many negative impacts on the environment, causing serious pollution problems to th...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/94B01D53/56
CPCB01D53/9418B01D2258/01B01J23/002B01J23/30B01J2523/00B01J2523/3712B01J2523/48B01J2523/47B01J2523/55B01J2523/69Y02T10/12
Inventor 赵磊朱增赞孙敏郭耘徐欢许顺磊汪银环卢冠忠朱延江
Owner 凯龙蓝烽新材料科技有限公司
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