Efficient and stable VOCs oxidative degradation pt/ceo 2 -tio 2 Preparation method of catalyst

An oxidative degradation and catalyst technology, which is applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc. problem, to achieve the effect of good application prospects, low catalyst cost, excellent low-temperature catalytic oxidation degradation activity and stability

Active Publication Date: 2021-09-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CeO 2 -TiO 2 Composite oxides are rich in weak and medium strong acid centers, which are very beneficial to the catalytic degradation of chlorine-containing VOCs (CVOCs), and have good tolerance, but when the exhaust gas contains other non-chlorine VOCs (such as n-hexane and benzene etc.), due to the insufficient oxidation ability of the catalyst, it is easy to make CeO 2 -TiO 2 Catalyst carbon deposition affects its stability

Method used

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  • Efficient and stable VOCs oxidative degradation pt/ceo <sub>2</sub> -tio <sub>2</sub> Preparation method of catalyst
  • Efficient and stable VOCs oxidative degradation pt/ceo <sub>2</sub> -tio <sub>2</sub> Preparation method of catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Dissolve 31.4g of cerous nitrate in 200ml of water, add 6.0ml of concentrated hydrochloric acid, stir evenly under ice bath conditions, then add 14.0g of TiCl dropwise 4 solution (concentration is 98%), continue to stir the solution until it becomes transparent, and then add dropwise ammonia water (NH 3 ·H 2 O) until the pH value of the above solution reaches 10.0, leave it at room temperature to age for 12 hours. Then filter, wash with deionized water several times until the filtrate is neutral, dry at 90°C for 12 hours, and roast at 500°C for 2 hours to obtain CeO 2 / TiO 2 CeO with a molar ratio of 1:1 2 -TiO 2 composite oxides.

[0016] 2g of powdered CeO 2 -TiO 2 The composite oxide was dispersed in 200ml of deionized water, after stirring evenly, 1.76g of vitamin C was added, and after stirring for 1 hour, it was washed several times with deionized water. Then add 1ml H 2 PtCl 6 aqueous solution (concentration is 10mgPt / ml), the pH value of the mixed solu...

Embodiment 2

[0018] With the same operation of embodiment 1, the difference is: change the consumption of cerous nitrate into 7.85g, in this catalyst, CeO 2 / TiO 2 The molar ratio is 1:4.

Embodiment 3

[0020] With the same operation of embodiment 1, the difference is: change the consumption of cerous nitrate into 15.7g, in this catalyst, CeO 2 / TiO 2 The molar ratio is 1:2.

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Abstract

The invention provides a highly efficient and stable Pt / CeO for oxidative degradation of VOCs 2 -TiO 2 The preparation method of the catalyst uses cheap cerous chloride or cerous nitrate, titanium tetrachloride, and a small amount of chloroplatinic acid as raw materials, and prepares CeO by precipitation 2 -TiO 2 Composite oxide support, Pt supported by electronless deposition method to prepare Pt / CeO 2 -TiO 2 Catalyst, CeO in catalyst 2 / TiO 2 The best molar ratio is 4:1~1:1. The preparation process of the catalyst is simple and the cost is low. The catalyst prepared by the present invention is especially suitable for catalytic combustion of organic waste gas containing chlorine-containing VOCs or non-chlorine-containing VOCs such as benzene and n-hexane, and the complete oxidation temperature of the catalyst to dichloroethane and n-hexane is only 290 ° C and At about 140°C, the catalytic activity does not decrease when they coexist, and has excellent low-temperature catalytic oxidation degradation activity and stability, and has a good application prospect.

Description

technical field [0001] The present invention relates to the preparation method of catalyst, specifically, a kind of highly efficient and stable VOCs oxidative degradation Pt / CeO 2 -TiO 2 Catalyst preparation method. Background technique [0002] Volatile organic compounds (VOCs) are a class of compounds that are extremely harmful to the environment and human health. They are widely derived from exhaust emissions from industries such as petrochemical production, printing and coating, food and rubber production. They are often complex in composition and large in exhaust volume. Catalytic combustion technology is one of the most important and effective means for the purification and treatment of VOCs pollutants, and the development of low-cost, high-efficiency, stable and broad-spectrum catalysts is the key to the application of this technology. CeO 2 -TiO 2 Composite oxides are rich in weak and medium strong acid centers, which are very beneficial to the catalytic degradat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63B01J37/03B01J32/00F23G7/07
CPCB01J21/063B01J23/63B01J37/031B01J37/035F23G7/07F23G2209/14
Inventor 周仁贤石壹军王佳露
Owner ZHEJIANG UNIV
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