Biotemplate Synthesis of Micron Braid Structure CeO2-TiO2 Composite and Analysis of its Catalytic Behavior for CO Oxidation

A series of CeO₂-TiO₂ composite samples with different Ce/Ti molar ratios were prepared by the paper template. Powder X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to confirm a face-centered cubic lattice of CeO₂ with Ce/Ti =8:2 or 9:1 and a two phase mixture of anatase titania and face-centered cubic ceria with Ce/Ti = 7 : 3. The field emission scanning electron microscopy (FESEM) results suggest that the products are micron braid structures consisting of fibers with diameters in a range of 1-6 ㎛ and lengths of several hundred micrometers. N₂ absorption-desorption testing shows that the composite at Ce/Ti molar fraction of 8 : 2 has the largest BET surface area (about 81 ㎡·g −1 ). Compared to the pure CeO₂ sample, the composites show superior catalytic activity for H₂ reduction and CO oxidation. For the micron braid structure CeO₂-TiO₂ composite (Ce/Ti = 8 : 2), due to the high surface area and the solid solution with appropriate Ti4+ incorporation, the CO conversion at about 280℃ was above 50% and at 400℃ was 100%.

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