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Pt/Ce-USY catalyst for oxidative degradation of chlorine-containing VOCs and preparation method of Pt/Ce-USY catalyst

A technology of oxidative degradation and NH4-USY, which is applied in the field of preparation of chlorine-containing VOCs low-temperature oxidative degradation catalysts, can solve the problems of unfavorable adsorption and activation, low oxidation activity, deactivation, etc., and achieve good low-temperature catalytic degradation activity and stability , Simple preparation process and high low-temperature oxidation activity

Inactive Publication Date: 2020-07-17
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

However, the chlorine-containing organic waste gas discharged from the actual industry often contains non-chlorinated hydrocarbon organic compounds (such as benzene and alkanes, etc.), but the oxidation activity of non-precious metal catalysts for such VOCs is not high. In addition, due to competitive adsorption, there is no Facilitate the adsorption and activation of catalysts on CVOCs, and easily deactivate due to carbon deposition

Method used

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  • Pt/Ce-USY catalyst for oxidative degradation of chlorine-containing VOCs and preparation method of Pt/Ce-USY catalyst

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preparation example Construction

[0011] The invention discloses a Pt / Ce-USY catalyst for oxidative degradation of chlorine-containing VOCs and a preparation method thereof. 3 ) 4 Cl 2 ·H 2 O), cerous chloride (CeCl 3 ·7H 2 O), ammonium-based ultra-stable Y molecular sieve (NH 4 -USY) as the main raw material, using the precipitation-deposition method to load CeO 2 Pt / Ce-USY catalyst prepared by loading Pt with ion exchange method, CeO in the catalyst 2 The content is 3-20%, and the Pt content is 0.1-0.45%. The specific preparation steps are as follows:

[0012] 1) According to the CeO 2 content, at a concentration of 0.012-0.12mol / L CeCl 3 Add a set amount of powdered NH to the aqueous solution 4 -USY, after stirring evenly, add ammonia water (NH 3 ·H 2 0), added dropwise until the pH value of the mixed solution reaches 9-11, then placed at room temperature and aged for 12 hours, then filtered, washed with deionized water several times until the filtrate was neutral, dried at 60°C for 12 hours, and...

Embodiment 1

[0017] Dissolve 1.3g of cerous chloride in 100ml of water, add 10g of powdered NH 4 -USY, after stirring evenly, add ammonia water (NH 3 ·H 2 0), add dropwise until the pH value of the mixed solution reaches 10.0, and place it at room temperature for aging for 12 hours, then filter, wash with deionized water several times until the filtrate is neutral, dry at 60°C for 12 hours, and roast at 550°C for 2 hours. , making CeO 2 The content is 6% Ce-USY.

[0018] Dissolve 0.081g of dichlorotetraammineplatinum II in 100ml of water, add the above powder Ce-USY, reflux at 100°C for 3 hours, cool to room temperature, add excess formaldehyde solution and let stand for 4 hours, then filter and deionize Washed several times with water until no Cl was detected in the filtrate - , dried at 60°C for 12 hours, and calcined at 500°C for 2 hours to prepare the Pt / Ce-USY catalyst. CeO in this catalyst 2 and Pt content are 6% and 0.45%, respectively.

Embodiment 2

[0020] With the same operation of embodiment 1, the difference is: change the consumption of dichlorotetraammine platinum II into 0.054g, and CeO in this catalyzer 2 and Pt contents are 6% and 0.3%, respectively.

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Abstract

The invention discloses a Pt / Ce-USY catalyst for oxidative degradation of chlorine-containing VOCs and a preparation method of the Pt / Ce-USY catalyst. According to the preparation method of the Pt / Ce-USY catalyst for oxidative degradation of chlorine-containing VOCs provided by the invention, tetraammineplatinum (II) dichloride, cerous chloride and an ultra-stable Y molecular sieve are used as rawmaterials, CeO2 is loaded by adopting a precipitation-deposition method and Pt is loaded by adopting an ion exchange method, and the contents of CeO2 and Pt in the catalyst are 3-20% and 0.1-0.45% respectively. The catalyst is simple in preparation process and low in cost, has good low-temperature catalytic oxidation activity and stability on chlorine-containing VOCs and non-chlorine-containing VOCs, and presents good application prospects.

Description

technical field [0001] The invention relates to a preparation method of a low-temperature oxidation degradation catalyst for chlorine-containing VOCs, in particular to a Pt / Ce-USY catalyst for oxidation degradation of chlorine-containing VOCs and a preparation method thereof. Background technique [0002] Chlorine-containing volatile organic compounds (CVOCs) are a class of compounds that are extremely harmful to the environment and human health. The common ones are dichloromethane (DCM), chloroform (CF), dichloroethane (DCE), trichloro Ethylene (TCE), carbon tetrachloride (CT), chlorobenzene (PhCl), etc., are widely used as organic solvents and semi-finished products in chemical production processes due to their good chemical stability. Catalytic combustion technology is one of the most important and effective methods for the purification of CVOCs pollutants, and the development of low-cost, high-performance catalysts is the key to the application of this technology. The c...

Claims

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Application Information

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IPC IPC(8): B01J29/12F23G7/07
CPCB01J29/126B01J2229/18F23G7/07F23G2209/14F23G2209/142
Inventor 周仁贤李志明石壹军王佳露
Owner ZHEJIANG UNIV
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