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Study of Catalytic Combustion of VOCs over Chromium-based Catalysts

Author: MaRuiHong
Tutor: LuoMengFei
School: Zhejiang Normal University
Course: Physical and chemical
Keywords: Chromium-based catalysts Methane oxidation Dichloromethane Ethyl acetate Toluene Catalytic combustion
CLC: O643.36
Type: Master's thesis
Year: 2010
Downloads: 70
Quote: 2
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Abstract


Catalytic combustion is a low energy consumption and high efficiency of processing organic waste gas treatment method (VOCs), NOx secondary pollution, etc., is not easy to form simple equipment in VOCs processing technology concern. Wherein the catalyst is the core of the VOCs catalytic combustion technology. Chlorinated organic emissions are more difficult to deal with a class of emission, reported chlorinated organic exhaust gas purification catalyst required higher reaction temperature and shorter life, there is an urgent need to improve the performance of the catalyst. Chlorinated organic waste gas processing, usually using Cr-based catalysts. Cr-based catalysts higher catalytic properties of chlorinated organic waste gas, but not organic hydrocarbon exhaust gas catalytic performance. Industrial emissions, however, is often a variety of VOCs exist simultaneously, i.e. in addition to the chlorinated organics, aromatic hydrocarbons, esters, alcohols and the like. Therefore, the development of chlorinated organics, oxygenated hydrocarbons and aromatic organic compounds with high catalytic performance of the catalyst, in order to meet the needs of industrial organic waste gas treatment, the research objectives of this paper. Obtained the following findings: 1. Prepared by deposition-precipitation the different the Cr content CrOx/ZrO2 catalyst, and the catalyst for CH4 oxidation catalytic performance. The experimental results show that the catalyst of Cr species present, the form of a crystal phase Cr2O3 carrier ZrO2 in monoclinic phase. With increasing calcination temperature, the catalyst ZrO2 and Cr2O3 grains increased significantly. Interaction between Cr2O3 and ZrO2 double the component CrOx/ZrO2 catalyst specific surface area greater than the corresponding one-component catalyst. With the improvement of the Cr content and enhanced catalyst CH4 oxidation performance, the activity of the catalyst by the Cr content of 20% at the highest, CH4 complete conversion temperature of 450 ° C. Further increase the catalytic activity of Cr content decreased due Cr2O3 grain increased sake. 2 by XRD and Raman Spectroscopy the CrOx/Al2O3 catalyst, found that most of the Cr in the catalyst species in the form of crystal phase Cr2O3, and presence of a small amount of the higher valence state to an amorphous phase or highly dispersed form. Catalyst for the catalytic reaction results in CH2Cl2, Cr content is 20% of the catalyst showed a high oxidation activity and the reaction stability, CH2Cl2, complete conversion of a temperature of 350 ° C. The result from the NH3-TPD Characterization the the the Cr load increases while increasing the surface acidity of the catalyst, 20% Cr and the load so that the increased surface acidity largest. Integrated active testing and characterization results, we believe that high valence Cr species in the catalyst is the activity of the catalytic oxidation of CH2Cl2 and CH2Cl2 oxidation of the surface of the catalyst acid sites favor. Through control CrOx-ZrO2 Pd/ZrO2 and Pd/CrOx-ZrO2 catalyst CH2Cl2, ethyl acetate and toluene catalytic performance and characterization results found CrOx-ZrO2 CH2C12 and ethyl acetate oxidation performance than toluene oxidation performance, while Pd/ZrO2 of toluene oxidation showed better performance; bicomponent Pd/CrOx-ZrO2 catalyst on three reactants showed higher catalytic performance. BET test and NH3-TPD characterization results show that the addition of Pd and Cr increases the ratio of surface area of ??the catalyst, to improve the surface acidity of the catalyst. This may be a high catalytic effect Pd/CrOx-ZrO2 performance reasons. In addition, Pd/CrOx-ZrO2 having a good reaction stability.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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