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Room Temperature Catalytic Ozonation of Toluene Over Transition Metal Oxides

Author: LongLiPing
Tutor: YeDaiQi
School: South China University of Technology
Course: Environmental Engineering
Keywords: Transition metal oxide Toluene Ozone Room temperature In situ diffuse reflectance infrared spectroscopy
CLC: X511
Type: Master's thesis
Year: 2011
Downloads: 105
Quote: 0
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Abstract


Volatile organic pollutants has become an important air pollutants, attracted the attention of the whole society. Room temperature ozone oxidation technology can simultaneously remove organic matter and ozone two pollutants, and without high-temperature reaction conditions are mild air purification technology is promising. However, this technology, particularly on the reaction process exploration than lacking. In this paper, normal temperature catalytic ozone oxidation of toluene reaction study investigated the structure-activity relationship of the catalyst, the catalyst surface the interaction of various substances, the use of in situ infrared spectroscopy to study the reaction pathways and mechanism, ozone catalytic oxidation technology for room temperature Applications to provide a scientific basis. Al2O3 load 5 transition metal oxide catalysts were prepared by impregnation investigated at room temperature, the catalytic ozonation toluene performance, the use of temperature-programmed reduction, temperature-programmed oxidation, N2 adsorption - desorption and X-ray photoelectron spectroscopy and other means The catalysts were characterized; study load of the active component, the concentration ratio of the reactants, and the humidity of the target response; through in situ diffuse reflectance infrared spectroscopy study reaction. The main conclusions are as follows: (1) NiO/Al2O3, CoO/Al2O3 MnO2/Al2O3 catalyst on the oxygen active center of the small number of catalyst ozone and toluene conversion rate; the Fe203/Al2O3 with CuO/Al2O3 catalyst due to the oxygen activity center of a large number of low catalytic efficiency. Have a higher rate of conversion of toluene on the catalyst with high the ozone catalytic degradation efficiency, CO2 yield of less than 30% under the experimental conditions of this article. (2) In this study the amount of load within MnO2/Al2O3 catalyst activity with increasing loading amount is reduced due to low load, the amount of catalyst with a high specific surface area and Mn4 proportion lower oxygen the number of active centers. The humidity of the mass transfer process of the ozone decomposition mechanism, as well as toluene and ozone impact and higher toluene and the ozone conversion rate can be obtained, under appropriate humidity. The toluene conversion rate is improved, and the increase of the concentration of ozone, the catalyst after the reaction surface of the product and the lattice oxygen content increases. (3) by means of in situ diffuse reflectance infrared spectroscopy study found that the catalytic activity of the catalyst surface to generate more of the type and quantity of the product, including COO, C = O and CO functional groups of substances formed during the reaction, the 03 concentration increased accelerate the COO-to C = O and the CO conversion. The former in the atmosphere of 570 KO2 almost no reaction at 500 K, and the latter begin to decompose. Ozone can react on the catalyst surface with adsorbed toluene. The high temperature at the same time can increase the number of activated molecules in the reaction of toluene, while also reducing the catalyst surface active oxygen species, reaction temperature of 373 K to obtain the highest efficiency. Based on the above results, the ozone reaction mechanism of the catalytic oxidation of toluene at room temperature.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Atmospheric pollution and its control > Gas pollutants
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