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Outline
Alumina microspheres with a lamellar-assembled morphology were synthesized via a urea-assisted hydrothermal method, and a Pd/Al2O3-M catalyst was prepared by incipient wetness impregnation. Its catalytic performance was systematically evaluated and compared with that of a commercial alumina-supported Pd catalyst in both the selective hydrogenation of isoprene and the hydrogenation of 2-ethylanthraquinone for hydrogen peroxide production. Characterization results reveal that the alumina microspheres exhibit a well-defined flower-like structure composed of stacked nanosheets, which promotes high Pd dispersion. Compared to Pd/Al2O3, the Pd/Al2O3-M catalyst shows higher Pd dispersion, stronger metal-support interaction, and more abundant surface-active sites. Under the reaction conditions of 60 ℃ and 1 MPa H2, the Pd/Al2O3-M catalyst exhibits superior performance in the hydrogenation of isoprene, achieving a conversion of 95.2% and a total selectivity of 98.3% to semi-hydrogenated isoamylenes. In the anthraquinone hydrogenation reaction, it reaches a hydrogenation efficiency of 15.8 g/L, representing a 27.4% enhancement over the reference catalyst. This study demonstrates that rational modulation of carrier morphology can significantly improve the performance of Pd catalysts in various hydrogenation reactions, providing a promising strategy for designing highly efficient hydrogenation catalysts.
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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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