Sol–gel preparation of crystalline Ni12P5/N-doped carbon and amorphous Ni–P–C catalysts and their high catalytic performances toward hydrogenation reduction reaction of 4-nitrophenol
| Autor: | Han Wang, Haitao Ni, Pingyun Li, Shengxiang Jiang |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | New Journal of Chemistry. 45:15801-15807 |
| ISSN: | 1369-9261 1144-0546 |
| DOI: | 10.1039/d1nj01616d |
| Popis: | Sol–gel method was used to prepare Ni12P5/N-doped carbon and amorphous Ni–P–C materials where the dried gel precursors were heated under N2 atmosphere in a tube furnace. By using ethylene diamine tetraacetic acid (EDTA) as the chelating agent, Ni12P5/N-doped carbon catalysts can be obtained when the heating temperatures were 700 °C and 800 °C. The Ni12P5/N-doped carbon nanomaterial heated at 800 °C exhibited high catalytic performance toward the hydrogenation reduction reaction of 4-nitrophenol (4-NP) using NaBH4 as the reducing agent. Pseudo first-order kinetics of the reaction can be observed, where catalytic activity parameters were 450.0 s−1 g−1 and 54.5 s−1 g−1 when the molar ratios of NaBH4 : 4-NP were 1000 : 1 and 100 : 1, respectively. When EDTA was replaced by ethylene glycol, amorphous Ni–P–C materials could be obtained when the heating temperatures were 350 °C, 450 °C, 550 °C, 600 °C and 700 °C. Unexpectedly, all the amorphous materials had desirable catalytic performances toward the hydrogenation of 4-NP. However, the kinetics of the reaction was pseudo zero-order over the amorphous catalysts. Our results provide new insight into the design of useful catalysts toward the hydrogenation reactions of 4-NP via the sol–gel method. |
| Databáze: | OpenAIRE |
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