| Autor: |
Johnson, Reece, Hu, Peijie, Pugh, James, Haridasan, Rahul Koottanil, Searles, Keith |
| Zdroj: |
Catalysis Science & Technology; 2025, Vol. 15 Issue: 1 p41-45, 5p |
| Abstrakt: |
Arene hydrogenation is an important catalytic reaction for the production of intermediates used in the synthesis of nylon, purification of gasoline fuels, and development of liquid organic hydrogen carriers. Herein is described the general utilization of organometallic complexes of early transition metals as pre-catalysts for the hydrogenation of benzene to cyclohexane. The metal precursors investigated for group 4 were [M(CH2tBu)4] (M = Ti, Zr, and Hf) and [V(CH2SiMe3)3(THF)] and [M2(μ2-CSiMe3)2(CH2SiMe3)4] (M = Nb and Ta) were chosen for group 5. These pre-catalysts were tested under semi-batch conditions at 120 °C and 400 psi of H2, with the highest initial activity from group 4 being [Hf(CH2tBu)4] (TOF = 1155 mol C6H6mol M−1h−1) and for group 5 [Nb2(μ2-CSiMe3)2(CH2SiMe3)4] (TOF = 1055 mol C6H6mol M−1h−1). These activities surpass 5 wt% Pd/C (TOF = 393 mol C6H6mol M−1h−1) and RANEY® nickel (TOF = 72 mol C6H6mol M−1h−1) tested under similar conditions. These catalytic performances offer new avenues in developing base metal catalysts for hydrocarbon conversion. |
| Databáze: |
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