Preparation method of efficient and stable Pt/CeO2-TiO2 catalyst for oxidative degradation of VOCs

Abstract

The invention provides a preparation method of an efficient and stable Pt / CeO2-TiO2 catalyst for oxidative degradation of VOCs (Volatile Organic Chemicals). Cheap cerous chloride or cerous nitrate, titanium tetrachloride and a small amount of chloroplatinic acid are used as raw materials; a CeO2-TiO2 composite oxide carrier is prepared by adopting a precipitation method, Pt is loaded by adopting an electron-free deposition method to prepare the Pt / CeO2-TiO2 catalyst, and the optimal molar ratio of CeO2 to TiO2 in the catalyst is 4: 1-1: 1. The catalyst is simple in preparation process and lowin cost. The catalyst prepared by the invention is particularly suitable for catalytic combustion of organic waste gas containing chlorine VOCs or non-chlorine VOCs containing benzene, normal hexane and the like; the complete oxidation temperature of the catalyst to dichloroethane and n-hexane is only about 290 DEG C and 140 DEG C respectively, the catalytic activity is not reduced when dichloroethane and n-hexane coexist, and the catalyst has excellent low-temperature catalytic oxidation degradation activity and stability and 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...

AI Technical Summary

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

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