Phenol hydrogenation to cyclohexanol on a novel Pd7P3/SiC catalyst with high activity and selectivity
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Cyclohexanol
Phosphide
The catalytic activity was enhanced by the introduction of C18PA on the support of the Ru/Nb 2 O 5 catalyst. The addition of more Lewis acid sites on the support activated the aromatic ring in phenol and promoted the formation of cyclohexanol.
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Cyclohexanol
Adipic acid
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Cyclohexanol
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Cyclohexanol
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Highly efficient Ni@C-400 catalyst for selective hydrogenation of phenol to cyclohexanol was developed from Ni-MOF-74.
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Abstract The preparations of [1,2,2,3,3,6,6‐D 7 ]Cyclohexanol, and of two isotopameric [1,2,2,3,4,5,5,6,6‐D 9 ]Cyclohexanols are described. The isotopic purity of the deuterium labeled cyclohexanols is better than 90 %.
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The selective oxidation of cyclohexanol to cyclohexanone was studied systematically using WO3,Na2WO4·2H2O,Na9[SbW9O33] and the prepared 9[SbW9O33] as tungsten-based catalysts and H2O2 as oxidant. The influence of the amount of substance ratio of the starting materials,the temperature and the reaction time were improved.9[SbW9O33] showed the highest catalytic activity.The conversion of cyclohexanol reaches 97.4% and the selectivity to cyclohexanone is 99.7% within 2 hours,while the temperature is 80 ℃ and the ratio of n(H2O2)∶n(cyclohexanol)∶n(9[SbW9O33]) is 75∶50∶0.06.
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In the two-step process for manufacturing cyclohexanol via cyclohexene from benzene, the procedure for effectively hydrating cyclohexene only in a reaction mixture obtained by partial hydrogenation of benzene is very important. This is because separating cyclohexene from the reaction mixture obtained in the first step is much more difficult than recovering benzene and cyclohexane after converting cyclohexene to cyclohexanol in the second step. Therefore, we investigated the optimum hydration conditions to obtaind cyclohexanol from a mixture using sulfuric acid and an additive. At a reaction temperature below 30°C, both the hydration rate and cyclohexanol yield decreased with lowering of the temperature. At a temperature over 30°C, the sulfonation of benzene and polymerization of cyclohexene easily occurred. Essentially the same was observed at the concentration and amount of sulfuric acid. Thus, the optimum temperature, sulfuric acid concentration and the used hydration were 30°C, 75%, and 2.7 mole to 1 mole of cyclohexene, respectively. As additives all metal salts were effective, but no alcohol used at this stage promoted cyclohexanol formation. The best additive was nickel sulfate. When a mixture of benzene (0.05mol), cyclohexene (0.15mol) and cyclohexane (0.3mol) was treated with 75% sulfuric acid (0.4mol) in the presence of nickel sulfate (0.01mol) at 30°C for 35h, the cyclohexanol yield was about 80%.
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A new type of decatungstate( [Mor1,2]4W10O32) was synthesized,puried,characterized and applied as catalyst in cyclohexanol oxidation. [Mor1,2]4W10O32was used as catalyst and 30% H2O2 as oxidant,oxidizing cyclohexanol to cyclohexanone. The effects of different amounts of catalyst,oxidant,reaction temperature and reaction time on the yield were systematically studied. The suitable reaction condition of cyclohexanol oxidation was suggested: at 80℃,cyclohexanol( 5mmol),catalyst( 30 μmol) and H2O2( 12. 5 mmol),and reacted for 8 h,the yield was 96%.
Cyclohexanol
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