Catalytic oxidation is a promising

Catalytic oxidation is a promising technology to control the emissions of volatile
organic compounds (VOC). From a practical point, the integration of such a process
with an adsorption system would be of great interest. The main goal of this thesis was
the development of active catalytic systems for the elimination of VOC. Three organic
compounds were chosen as a model of volatile organic compounds: ethyl acetate,
ethanol and toluene. The catalytic oxidation of these compounds was studied
individually and in mixtures.
In the first part of this work the oxidation of ethyl acetate, ethanol and toluene was
investigated over several catalysts (supported noble metals, mixed oxides and base
metal oxides) in order to select the most promising catalytic systems for further
development. Cryptomelane type manganese oxide and noble metal supported on
titania were the catalysts selected.
The second part of this work describes the preparation, characterization and
application of manganese oxides in the oxidation of ethyl acetate, ethanol and toluene.
Concerning catalyst preparation, it was observed that it is possible to tailor the shape,
crystalline phase and chemical composition of manganese oxide materials by
controlling the pH and the template cation.
Cryptomelane was found to be very active in the oxidation of VOC, and its
performance was significantly affected by the presence of other phases, namely Mn2O3
and Mn3O4. The latter improves the catalytic performance by increasing the reactivity
and mobility of lattice oxygen, while the former has the opposite effect. A correlation
between the redox properties and the activity of the manganese oxides was proposed,
and a Mars and van Krevelen mechanism was established. The reactivity of VOC (in
terms of conversion into CO2) was found to increase in the following order:
Toluene

ผลลัพธ์ (ไทย) 1:

Catalytic oxidation is a promising technology to control the emissions of volatileorganic compounds (VOC). From a practical point, the integration of such a processwith an adsorption system would be of great interest. The main goal of this thesis wasthe development of active catalytic systems for the elimination of VOC. Three organiccompounds were chosen as a model of volatile organic compounds: ethyl acetate,ethanol and toluene. The catalytic oxidation of these compounds was studiedindividually and in mixtures.In the first part of this work the oxidation of ethyl acetate, ethanol and toluene wasinvestigated over several catalysts (supported noble metals, mixed oxides and basemetal oxides) in order to select the most promising catalytic systems for furtherdevelopment. Cryptomelane type manganese oxide and noble metal supported ontitania were the catalysts selected.The second part of this work describes the preparation, characterization andapplication of manganese oxides in the oxidation of ethyl acetate, ethanol and toluene.Concerning catalyst preparation, it was observed that it is possible to tailor the shape,crystalline phase and chemical composition of manganese oxide materials bycontrolling the pH and the template cation.Cryptomelane was found to be very active in the oxidation of VOC, and itsperformance was significantly affected by the presence of other phases, namely Mn2O3และ Mn3O4 หลังปรับปรุงประสิทธิภาพของตัวเร่งปฏิกิริยา โดยเพิ่มการเกิดปฏิกิริยาและการเคลื่อนไหวของออกซิเจนตาข่าย ในขณะที่ในอดีตมีผลตรงข้าม ความสัมพันธ์ระหว่างคุณสมบัติอกซ์และกิจกรรมของออกไซด์แมงกานีสถูกนำเสนอและดาวอังคารและรถตู้ Krevelen กลไกก่อตั้ง การเกิดปฏิกิริยาของ VOC (เงื่อนไขการแปลงสภาพเป็น CO2) พบว่าการเพิ่มขึ้นในลำดับต่อไปนี้:โทลูอีน