Atom??economy Synthesis of N??Substituted Carbamate from Urea Derivative and Dimethyl Carbonate Catalyzed by La/SiO2: Characterization and Activity

X Guo, J Shang, J Li, L Wang, Y Ma…

文献索引：Guo, Xiaoguanga; Shang, Jianpenga; Li, Jiana; Wang, Liguoa; Ma, Yuboa; Shi, Feng; Deng, Youquan Chinese Journal of Chemistry, 2010 , vol. 28, # 2 p. 164 - 170

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被引用次数: 7

摘要

Abstract A series of silica gel immobilized lanthanum catalysts were prepared for the atom- economy synthesis of N-substituted carbamates from urea derivatives and dimethyl carbonate. The La/SiO 2 catalysts with lanthanum loadings varied from 1.3 wt% to 8.5 wt% were characterized by AES, BET, XRD, TEM, FT-IR, XPS and TPD. According to the characterization, lanthanum species with particle sizes of 5–10 nm on the surface of silica ...