Synthesis of methyl N-phenyl carbamate from phenyl urea and methanol over the KF/Al2O3 catalyst

FENG Yue-lan; WANG Jun-wei; LI Qi-feng; KANG Mao-qing; WANG Xin-kui

Volume 41 Issue 12

Dec. 2013

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Article Navigation > Journal of Fuel Chemistry and Technology > 2013 > 41(12): 1507-1511

FENG Yue-lan, WANG Jun-wei, LI Qi-feng, KANG Mao-qing, WANG Xin-kui. Synthesis of methyl N-phenyl carbamate from phenyl urea and methanol over the KF/Al2O3 catalyst[J]. Journal of Fuel Chemistry and Technology, 2013, 41(12): 1507-1511.

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FENG Yue-lan, WANG Jun-wei, LI Qi-feng, KANG Mao-qing, WANG Xin-kui. Synthesis of methyl N-phenyl carbamate from phenyl urea and methanol over the KF/Al₂O₃ catalyst[J]. Journal of Fuel Chemistry and Technology, 2013, 41(12): 1507-1511.

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Synthesis of methyl N-phenyl carbamate from phenyl urea and methanol over the KF/Al₂O₃ catalyst

Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

Received Date: 2013-05-11
Rev Recd Date: 2013-07-29
Publish Date: 2013-12-30

Abstract

Abstract

The solid alkaline catalysts of supported potassium halides were prepared by impregnation method and used in the methanolysis of phenyl urea with methanol to synthesize methyl N-phenyl carbamate (MPC); the influence of oxide supports and potassium halides on the catalyst performance was investigated. The results indicated that KF/Al₂O₃ exhibits high catalytic activity and selectivity to MPC; the KF/Al₂O₃ catalyst containing 50% KF and calcined at 500 ℃ for 4 h performs best in the methanolysis of phenyl urea, over which the conversion of phenyl urea and selectivity to MPC reach 96.5% and 86.3%, respectively. The XRD results proved that KF and Al₂O₃ are partially transformed to K₃AlF₆ due to the strong interaction between KF and Al₂O₃. Both KF and K₃AlF₆ are active for the activation of methanol and selective conversion of phenyl urea; the excellent performance of KF/Al₂O₃ catalyst in the methanolysis of phenyl urea to MPC can be ascribed to the synergy of KF and K₃AlF₆.
- KF/Al₂O₃,
- methyl N-phenyl carbamate,
- phenyl urea,
- methanol

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References

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