摘要： Pd/TiO(2) and Pd/CeO(2) were reported to be very active to destruct toluene. Combination of TiO(2) and CeO(2) is an interesting candidate to achieve a catalyst with higher activity. In this study, a series of Pd/CeO(2)-TiO(2) catalysts with various Pd loadings were prepared. CeO(2)-TiO(2) was prepared by impregnation of aqueous solution of cerium nitrate into TiO(2) support. It was then calcined at 400 degree C. Pd was loaded by incipient-wetness impregnation method. The Pd loadings in all samples were fixed at 0.5 wt.%. The catalysts were characterized by powder X-ray diffraction, transmission electron microscopy, high resolution transmission electron microscopy, temperature-programmed reduction of hydrogen, and X-ray photoelectron spectroscopy. The catalysts were tested for total oxidation of toluene. The feed concentration of toluene was 8.564 g/m(3) (2085 ppm), with GHSV = 10,000 h(-1). Pd particle sizes were 3-5 nm and well-dispersed on the support. CeO(2) on TiO(2) was easier to reduce than the bulk CeO(2), therefore it could enhance the activity of VOC destruction. Pd/CeO(2)-TiO(2) was more active than Pd/CeO(2) and Pd/TiO(2). Pd/CeO(2)-TiO(2) with Ce/Ti ratio of 2/8 was very active for toluene destruction, due to its lower oxygen reduction temperature of ceria and higher concentration of Pd(0). 出版日期： 2013-03-01 出處： Journal of nanoscience and nanotechnology, 2013-03, Vol.13 (3), p.2171-2178 識別號： ISSN: 1533-4880 識別號： DOI: 10.1166/jnn.2013.6895
