Highly selective oxidation of toluene using air over [Fe(III)TPP]Cl supported on chitosan

2008 ◽  
Vol 86 (3) ◽  
pp. 199-204 ◽  
Author(s):  
Guan Huang ◽  
Chun-Cai Cai ◽  
Jin Luo ◽  
Hong Zhou ◽  
Yong-An Guo ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Environmental Pollution ◽  
Benzyl Alcohol ◽  
Catalytic Oxidation ◽  
Iron Porphyrin ◽  
Optimum Conditions ◽  
Toluene Oxidation ◽  
Selective Catalytic Oxidation ◽  
Amine Groups ◽  
Chitosan Chain

The highly selective catalytic oxidation of toluene with air to benzaldehyde and benzyl alcohol in the liquid phase has been studied with the use of iron tetraphenylporphyrin (Fe TPP) supported on chitosan (CTS), (Fe TPP/CTS). The rates of toluene conversion and selectivity (aldehyde + alcohol) were subject to the reaction temperature, air pressure, and amount of iron tetraphenylporphyrin. By the use of the Fe TPP/CTS, containing 2 mg of iron tetraphenylporphyrin as catalyst, toluene oxidation with air under the optimum conditions of 190 °C and 0.6 MPa produced benzaldehyde and benzyl alcohol at 90% selectivity and 5.4% conversion of toluene, the mole turnover of the catalyst was about 6 × 106, and it could be reused efficiently for one more time. It is suggested that the amine groups (–NH2) on the chitosan chain act as a key assistor to the catalysis of Fe TPP for toluene oxidation. Compared with the conventional method of synthesizing benzaldehyde and benzyl alcohol, the new method has the advantages of reduced environmental pollution, higher selectivity for the two main products, and easy recovery of the catalyst.Key words: chitosan-supported iron porphyrin, catalysis, toluene oxidation, benzaldehyde, benzyl alcohol.

Solvent-free liquid-phase selective catalytic oxidation of toluene to benzyl alcohol and benzaldehyde over CeO2-MnOx composite oxides

2022 ◽  
Author(s):  
Gui Chen ◽  
Kuiyi You ◽  
Xiangbo Gong ◽  
Fangfang Zhao ◽  
Zhenpan Chen ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Benzyl Alcohol ◽  
Catalytic Oxidation ◽  
Molecular Oxygen ◽  
Efficient Method ◽  
Value Added ◽  
Solvent Free ◽  
Composite Oxides ◽  
Selective Catalytic Oxidation

An efficient method for highly selective preparation of the high value-added benzyl alcohol (BOL) and benzaldehyde (BAL) from liquid-phase catalytic oxidation of toluene with molecular oxygen over CeO2-MnOx composite oxides...

scholarly journals Selective Catalytic Oxidation of Benzyl Alcohol to Benzaldehyde by Nitrates

2020 ◽  
Vol 8 ◽  
Author(s):  
Shurui Xu ◽  
Jie Wu ◽  
Peng Huang ◽  
Chunwen Lao ◽  
Hanchao Lai ◽  
...  
Keyword(s):  
Benzyl Alcohol ◽  
Catalytic Oxidation ◽  
Oxidation Of Benzyl Alcohol ◽  
Selective Catalytic Oxidation

Catalysis of μ-oxo-bis[porphyriniron(III)] for toluene oxidation with molecular oxygen

2006 ◽  
Vol 10 (07) ◽  
pp. 948-952 ◽  
Author(s):  
Hai-Yang Hu ◽  
Quan Jiang ◽  
Qiang Liu ◽  
Jian-Xin Song ◽  
Wei-Ying Lin ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Benzyl Alcohol ◽  
Molecular Oxygen ◽  
Metal Ion ◽  
Oxidation Products ◽  
Iron Porphyrin ◽  
Turnover Number ◽  
Reaction Conditions ◽  
Toluene Oxidation ◽  
Oxidation With Molecular Oxygen

Toluene oxidation with molecular oxygen as the sole oxidant, and μ-oxo-bis[tetraphenylporphinatoiron(III)] as the catalyst, are reported. Under the reaction conditions of 438 K and 0.8 MPa, the molar total yields for the products benzaldehyde and benzyl alcohol and the turnover number of the catalyst are 4.35% and 21,830 (based on the metal ion), respectively. Compared with the reaction catalyzed by the corresponding monometalloporphyrin TPPFe III Cl , the total yields of the oxidation products and the catalyst turnover number by the dimeric iron porphyrin were almost twice those by the former. A possible reaction mechanism of the toluene oxidation by μ-oxo-bis[tetraphenylporphinatoiron(III)] is proposed.

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