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

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	Atom-economy Synthesis of N-substituted Carbamate from Urea Derivative and Dimethyl Carbonate Catalyzed by La/SiO2: Characterization and Activity
	Shang JP(尚建鹏); Shi F(石峰); Deng YQ(邓友全); Deng YQ(邓友全)
刊名	Chinese Journal of Chemistry
	2010
卷号	28 页码:164-170
关键词	N-substituted carbamate urea derivative dimethyl carbonate lanthanum green chemistry
ISSN号	1001-604X
通讯作者	石峰 ; 邓友全
中文摘要	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/SiO2 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 gel were formed. The catalysts were all amorphous and the surface areas were 336.5—530.2 m2/g. NH3-TPD analysis showed that all samples exhibited similar acid strength with different acid amounts. FT-IR measurement indicated that the component of lanthanum speci es on the catalyst surface were La(OH)3, LaOOH and hydrated La2O3. Also, the peak value of the absolute amount of LaOOH was obt ained with 4.3 wt% lanthanum loading. The BET surface area decreased dramatically when the lanthanum loading was above 4.3 wt%. In consideration of the results ob-tained from the catalytic reactions, it could be concluded that LaOOH was the possible active species and high sur-face area was important for the high catalytic activity.
学科主题	物理化学
收录类别	SCI
资助信息	the National Natural Science Foundation of China (No. 20503037)
语种	英语
公开日期	2012-12-01
内容类型	期刊论文
源URL	[http://210.77.64.217/handle/362003/2304]
专题	兰州化学物理研究所_绿色化学研究发展中心
通讯作者	Shi F(石峰); Deng YQ(邓友全); Deng YQ(邓友全)
推荐引用方式 GB/T 7714	Shang JP,Shi F,Deng YQ,et al. Atom-economy Synthesis of N-substituted Carbamate from Urea Derivative and Dimethyl Carbonate Catalyzed by La/SiO2: Characterization and Activity[J]. Chinese Journal of Chemistry,2010,28:164-170.
APA	尚建鹏,石峰,邓友全,&邓友全.(2010).Atom-economy Synthesis of N-substituted Carbamate from Urea Derivative and Dimethyl Carbonate Catalyzed by La/SiO2: Characterization and Activity.Chinese Journal of Chemistry,28,164-170.
MLA	尚建鹏,et al."Atom-economy Synthesis of N-substituted Carbamate from Urea Derivative and Dimethyl Carbonate Catalyzed by La/SiO2: Characterization and Activity".Chinese Journal of Chemistry 28(2010):164-170.