Synthesis Of Ceria-based Catalysts By Using Mesoporous Polymers As Templates For CO Oxidation

As a colorless and odorless toxic gas,carbon monoxide comes from automobile exhaust and fossil fuel combustion,which can induce tissue hypoxia and even suffocate people to death.Nowadays,the CO oxidation can be efficiently catalyzed by transition-metal oxides.And the activity of those catalysts is controlled by the interactions of metal and support.In this regard,strategies for controlling these interactions to optimize performance are highly desirable.Until now,the regulation of interaction can be roughly divided into geometric regulation and electronic regulation.Thus,the Au-Ce O₂-P with high concentration of oxygen vacancy is synthesized by using OMP-NH₂as template through electronic regulation,which has shown excellent catalytic performance in CO oxidation(T₁₀₀=10℃).In addition,mechanochemistry method provide an efficient route for the synthesis of X%Cu O/Ce O₂-OMP catalyst,which has shown good catalytic activity in CO oxidation(T₁₀₀=80℃):（1）The solid solution catalyst possesses good catalytic activity,which is related to the concentration of oxygen vacancy induced by lattice distortion.Therefore,how to construct ceria-based catalysts with higher oxygen vacancy concentration is the key to improve the performance of catalysts.Due to the Au³⁺cations are embedded in the Ce O₂ lattice with the help of amino functional group and alkaline environment.In this paper,we conduct a facile synthesis strategy for Au-Ce-O catalysts by a co-precipitation method with the assistance of amino groups functionalized ordered mesoporous polymer（OMP-NH₂）.And ceria-based solid solution catalyst with high catalytic performance was successfully synthesized.In order to explore the catalytic performance of Au-Ce-O catalyst,a series of characterization was carried out on the synthesized samples.Among the Au-Ce O₂-P catalysts,the Au-Ce O₂-9.6 sample exhibits the best catalytic activity with a highest concentration of oxygen vacancies of13.98%and H₂ consumption for 1.02 mmol/g(T₁₀₀=10℃,21600 m L（h gcat）^-1).（2）Copper-ceria catalyst show a wide activation window temperature in CO oxidation due to the interaction between Cu O and Ce O₂,especially for the highly dispersed copper species.In this paper,we conduct a facile synthesis strategy（mechanical casting）for X%Cu O/Ce O₂-OMP catalysts with the assistance of OMP-NH₂.And a series of X%Cu O/Ce O₂-OMP catalysts with different Cu/Ce ratio were synthesized by this method.With the participation of OMP-NH₂,the morphology of catalyst could be well maintained,and the mesoporous X%Cu O/Ce O₂-OMP catalyst could be formed after roasting.In order to explore the catalytic performance of X%Cu O/Ce O₂-OMP catalysts,a series of characterization were carried out.Among the X%Cu O/Ce O₂-OMP catalysts,the 5%Cu O/Ce O₂-OMP sample exhibits the best catalytic activity with a highest concentration of oxygen vacancies of 10.46%(T₁₀₀=80℃,21600 m L（h gcat）^-1).