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Outline
Taking the well-structured rod-like SBA-15 as support, Pd1Cox/SBA-15 bimetallic catalysts with different palladium(Pd) and cobalt(Co) molar ratios were prepared by adjusting the Co content for acetone (C3H6O) catalytic oxidation. Among these, the Pd1Co1/SBA-15 catalyst was found to exhibit superior performance for the low-temperature oxidation of C3H6O, achieving 90% conversion at 220℃, along with high CO2 selectivity and thermal stability. Characterization by SEM, XRD, FT-IR, and N2 adsorption-desorption was conducted, and it was revealed that Pd1Co1/SBA-15 possessed the optimal Pd/Co ratio and a higher specific surface area, which were crucial for the stabilization and exposure of active sites. Further investigations using H2-TPR, O2-TPD, and XPS indicated that the primary active oxygen species in Pd1Co0.5/SBA-15 and Pd1Co3/SBA-15 were chemisorbed oxygen, while surface lattice oxygen was predominantly present in Pd1Co1/SBA-15. Moreover, the transformation of abundant active oxygen species in Pd1Co1/SBA-15 was significantly promoted. The reaction mechanism of acetone oxidation over Pd1Co1/SBA-15 was elucidated by in-situ infrared spectroscopy. The decomposition path of acetone molecules over Pd1Co1/SBA-15 catalyst was determined as C3H6O→CH3CH2OH→CH3COO-→COO-→CO2, which further indicated that enhanced surface lattice oxygen can significantly accelerate activation and cleavage during the acetone oxidation process.
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| 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 |
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