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- W2178324625 abstract "The direct hydroxylation of benzene to phenol over a Cu impregnated zeolite catalyst (Cu/HZSM-5) is performed in airflow. Phenol is obtained as a main product in a yield of 2.5%, however, the selectivity of phenol is low (44.0%) due to the formation of by-products such as hydroquinone, p-benzoquinone, CO, and CO2. The use of Cu/HZSM-5 leads to a significantly higher selectivity of phenol (94.0%) under an O2 partial pressure that is lower than the atmospheric O2 partial pressure. It is found that excess O2 in the gas-phase causes the formation of by-products, whereas a decrease of O2 partial pressure prevents the by-products from forming. Moreover, the addition of Ti to Cu/HZSM-5 leads to improved phenol formation activity. Good yield (4.3%) and selectivity (88.0%) of phenol are achieved over Cu/Ti/HZSM-5 under a low O2 partial pressure. The addition of Ti is found to accelerate the formation of Cu+ as an active site. It is therefore speculated that phenol can be formed selectively over Cu/Ti/HZSM-5 under lower O2 partial pressure owing to the increase of Cu+ sites by Ti addition and the prevention of by-product formation by the decreased O2 partial pressure." @default.
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- W2178324625 date "2016-01-01" @default.
- W2178324625 modified "2023-09-25" @default.
- W2178324625 title "Selective catalytic oxidation of benzene over Cu/Ti/HZSM-5 under low oxygen pressure for one step synthesis of phenol" @default.
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- W2178324625 doi "https://doi.org/10.1016/j.molcata.2015.11.007" @default.
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