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One‐Pot Preparation of Methyl N‐Phenyl Carbamate and Zn(OAc)2/SiO2 Catalyst with Enhanced Stability
ChemistrySelect ( IF 1.9 ) Pub Date : 2019-09-19 , DOI: 10.1002/slct.201902219 Fang Li 1 , Song Li 1 , Aizhong Jia 1 , Liya Gao 1 , Wei Xue 1 , Yanhua Zhang 1 , Yanji Wang 1
ChemistrySelect ( IF 1.9 ) Pub Date : 2019-09-19 , DOI: 10.1002/slct.201902219 Fang Li 1 , Song Li 1 , Aizhong Jia 1 , Liya Gao 1 , Wei Xue 1 , Yanhua Zhang 1 , Yanji Wang 1
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The one‐pot preparation of methyl N‐phenyl carbamate (MPC) and supported Zn(OAc)2/SiO2‐OP was investigated. Zn(OAc)2 and SiO2 were added to the reaction between dimethyl carbonate (DMC) and aniline upon which MPC and Zn(OAc)2/SiO2‐OP were obtained simultaneously. The co‐prepared Zn(OAc)2/SiO2‐OP showed superior catalytic performance for MPC synthesis, giving a aniline conversion of 96.3% and a MPC selectivity of 99.7%. Compared with catalyst prepared by incipient impregnation, Zn(OAc)2/SiO2‐OP was more stable during the reaction, and the aniline conversion was 85.0% with MPC selectivity of 88.2% for the seventh time. The catalyst was characterized and the results suggested that Zn(OAc)2, Zn5(OH)8(OAc)2⋅2H2O, ZnO and Zn4O(OAc)6 are present on SiO2 surface. Zn(OAc)2 and Zn4O(OAc)6 are the active sites for MPC synthesis. The superior stability of the Zn(OAc)2/SiO2‐OP catalyst came from the presence of Zn4O(OAc)6.
中文翻译：
一锅法制备N-苯基氨基甲酸甲酯和Zn（OAc）2 / SiO2稳定性增强的催化剂
研究了一锅法制备N-苯基氨基甲酸甲酯（MPC）和负载的Zn（OAc）2 / SiO 2 -OP。将Zn（OAc）2和SiO 2添加到碳酸二甲酯（DMC）和苯胺之间的反应中，同时获得MPC和Zn（OAc）2 / SiO 2 -OP。共同制备的Zn（OAc）2 / SiO 2 -OP对MPC合成显示出优异的催化性能，苯胺转化率为96.3％，MPC选择性为99.7％。Zn（OAc）2 / SiO 2与用初期浸渍法制备的催化剂相比-OP在反应期间更稳定，苯胺转化率为85.0％，第七次MPC选择性为88.2％。该催化剂的特征在于，其结果表明，锌（OAC）2，锌5（OH）8（OAC）2 ⋅2H 2 O，ZnO和锌4 O（OAc）6存在在SiO 2表面上。Zn（OAc）2和Zn 4 O（OAc）6是MPC合成的活性位点。Zn（OAc）2 / SiO 2－OP催化剂的优异稳定性来自Zn 4 O（OAc）6的存在。
更新日期：2019-09-19
中文翻译：
一锅法制备N-苯基氨基甲酸甲酯和Zn（OAc）2 / SiO2稳定性增强的催化剂
研究了一锅法制备N-苯基氨基甲酸甲酯（MPC）和负载的Zn（OAc）2 / SiO 2 -OP。将Zn（OAc）2和SiO 2添加到碳酸二甲酯（DMC）和苯胺之间的反应中，同时获得MPC和Zn（OAc）2 / SiO 2 -OP。共同制备的Zn（OAc）2 / SiO 2 -OP对MPC合成显示出优异的催化性能，苯胺转化率为96.3％，MPC选择性为99.7％。Zn（OAc）2 / SiO 2与用初期浸渍法制备的催化剂相比-OP在反应期间更稳定，苯胺转化率为85.0％，第七次MPC选择性为88.2％。该催化剂的特征在于，其结果表明，锌（OAC）2，锌5（OH）8（OAC）2 ⋅2H 2 O，ZnO和锌4 O（OAc）6存在在SiO 2表面上。Zn（OAc）2和Zn 4 O（OAc）6是MPC合成的活性位点。Zn（OAc）2 / SiO 2－OP催化剂的优异稳定性来自Zn 4 O（OAc）6的存在。
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