Taiwan Institute of Chemical Engineers;Elsevier B.V
摘要:
摘要： •0.5 wt% Pd/ZrO2CeO2 is very active to destruct low concentration toluene in air at low temperature.•The activities of the catalysts decreased in the order: Pd/ZrO2CeO2> Pd/MnO2CeO2> Pd/CuOCeO2> Pd/ZnOCeO2> Pd/CeO2.•10% ZrO2CeO2 prepared by co-precipitation forms solid solution. It creates more defect sites of CeO2 and increase oxygen storage capacity.•Adding additives on the Pd/CeO2 created the synergetic effect, resulting in high activity for complete oxidation of toluene. In this study, a series of 0.5 wt% Pd/modified-CeO2 catalysts with different metal additives were prepared by incipient-wetness impregnation method. The samples were characterized by powder X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. The catalysts were tested for total oxidation of toluene, the feed concentration was 8.564 g/m3 (2085 ppm) with GHSV of 10,000 h−1. The XRD patterns only showed intense CeO2 peaks, no characteristic peak for palladium and additive oxides were observed, inferring that the particle size of palladium was less than 4 nm and additive oxide was also well-dispersed. The TEM images confirmed that the average particle size of palladium was 2–4 nm and they were well dispersed on the support. After loading different modifiers, the concentration of metallic palladium species increased. The activities of the catalysts decreased in the order: Pd/ZrO2CeO2> Pd/MnO2CeO2> Pd/CuOCeO2> Pd/ZnOCeO2> Pd/CeO2. Pd/ZrO2CeO2 showed the highest activity among all catalysts. The presence of additives increased the oxygen storage of CeO2. Adding additives on the Pd/CeO2 created the synergetic effect, resulting in high activity for complete oxidation of toluene. [Display omitted] 出版者： Elsevier B.V 出版日期： 2016-10 出處： Journal of the Taiwan Institute of Chemical Engineers, 2016-10, Vol.67, p.69-73 資源來源： ScienceDirect Journals 版權： 2016 Taiwan Institute of Chemical Engineers 識別號： ISSN: 1876-1070 識別號： EISSN: 1876-1089 識別號： DOI: 10.1016/j.jtice.2016.07.033
