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To enhance the reaction rate of V2O3 preparation by hydrogen reduction from V-rich solution, Raney Ni was synthesized by selectively leaching aluminum from a Ni-Al alloy using an alkaline leaching method. This Raney Ni was employed as a catalyst to reduce the activation energy for the hydrogen reduction vanadium precipitation reaction. Characterization results from XRD, SEM, and BET indicate that the leaching of aluminum creates numerous pores and fissures, significantly increasing the specific surface area of the Raney Ni and providing abundant active sites for the hydrogen reduction vanadium precipitation reaction. Under the optimal conditions of Raney Ni dosage of 10 g/L, hydrogen partial pressure of 3 MPa, reaction temperature of 250 ℃, solution pH of 5, and reaction time of 100 min, the vanadium precipitation rate reaches 99.84%. The Raney Ni demonstrates excellent cycling stability, after magnetic separation and five reuse cycles, the purity of the obtained V2O3 product remains stable at 99.27%. The apparent activation energy for the Raney Ni-catalyzed hydrogen reduction reaction is determined to be 96.254 4 kJ/mol, indicating that the hydrogen reduction process is primarily controlled by chemical reaction. Raney Ni catalyst exhibits effective vanadium precipitation performance, ease of magnetic separation, and high stability. The V2O3 product prepared by catalyzed hydrogen reduction with it have high purity, and certain potential for promotion and application.
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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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