Pretreatment of the carrier for supported catalysts can effectively improve the strong metal-support interaction (SMSI) and increase the dispersion of precious metals, which are critical to many important catalytic reactions. In this work, we tuned SMSI on Pd/TiO2 catalysts through inducing surface defects of TiO2 by pretreated with different atmospheres (H2/N2, N2, O2/N2) at the high temperature (800 ℃). Multiple characterization results illustrated that surface defects anchored Pd species and thus enhanced their dispersion. During reduction, Ti3+ species formed and transferred onto the metallic Pd species and then induced SMSI, which effectively stabilize Pd species in the metallic state. The stronger MSI, the more stability of Pd species. As a case, Pd/TiO2–800H2, with strongest MSI, displayed the best HCHO oxidation performance at low temperature (10 ℃).
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |