Study On The Performance Of Mesoporous Metal Oxides Supported Au Noble Metal Catalysts For Catalytic Combustion Of C₂H₂

In recent years,fossil resources produced VOCs has become one of the most pollution source of air pollution.C₂H₂ as an important part of VOCs,it is flammable and explosive and has a weak anesthesia effect on the human body,inhalation of excess will cause a headache,fatigue and other severe cases will be choked to death.In this study,C₂H₂ was used as the representative of VOCs to study the properties of ordered mesoporous metal oxides and their supported noble metal catalysts catalytic combustion of acetylene.This paper adopts KIT-6 mesoporous molecular sieve with bicontinuous cubic structure as hard template,synthesis mesoporous CeO₂ ?mesoporous Co₃O₄ and mesoporous Co₃O₄ catalyst which supported Au.The catalysts were characterized by methods of XRD,BET,UV-Vis H2-TPR,XPS,TEM and other means of characterization of the catalyst.The spatial structure of the synthesized Co₃O₄ and CeO₂ catalysts are ordered.Compared with bulk Co₃O₄,Ordered mesoporous Co₃O₄ specific surface area increased from 3.8 m2/g to 96.4 m2/g,it catalytic combustion of C₂H₂ began burning at 90 °C and completely conversion at 160 °C.Compared with bulk CeO₂,the specific surface area of the ordered mesoporous CeO₂ was increased to 151.3 m2/g,the ignition temperature of the catalytic combustion C₂H₂ was reduced to 50 °C and the complete conversion temperature was decreased to 150 °C.The optimum calcination temperature of mesoporous Co₃O₄ supported Au catalysts was 350 °C.The optimum Au loading of the catalysts was 3 %.The ignition temperature was 50 °C and completely conversion temperature is 150 °C.Thus,Loading noble metal and making pore can enhance the activity of catalyst at low temperature.