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7564311 
Journal Article 
Clean synthesis of methyl N-cyclohexyl carbamate over supported alumina catalysts 
Chen, Y; Zhao, XQ; Wang, YJ 
2005 
21 
4 
56-61 
Chinese 
The reaction of synthesizing methyl N-cyclohexyl carbamate (MCHC) from cyclohexylamine and dimethyl carbonate (DMC) was thermodynamically analyzed. The supported alumina catalysts for this reaction were prepared by impregnation method and evaluated in an autoclave to investigate their activity. Under the conditions of reaction temperature 110°C, molar ratio of cyclohexylamine to DMC 1:20 and reaction time 9 h, the yield of MCHC over 10% Al2O3-SiO2 catalyst was 68.1%. Al2O3-SiO2 catalysts were characterized by XRD, XPS and BET, and it was shown that some changes of Al3+ from tetrahedron to octahedron occurred during the reaction process, which results in the decline of the catalytic activity of Al2O3-SiO2. 
Cyclohexylamine; Dimethyl carbonate; Methyl N-cyclohexyl carbamate; Supported alumina catalyst; Thermodynamic analysis; Alumina; Catalyst activity; Catalysts; Impregnation; Silica; Synthesis (chemical); Thermodynamics; Cyclohexylamine; Dimethyl carbonate; Methyl N cyclohexyl carbamate; Supported alumina catalyst; Carbonates 
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