The synthesis of diphenyl carbonate from dimethyl carbonate and phenol over mesoporous MoO3/SiMCM-41
The synthesis of diphenyl carbonate from dimethyl carbonate and phenol over mesoporous MoO3/SiMCM-41
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DOI：
10.1016/j.molcata.2008.04.018
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发表时间：
2008-06-17
影响因子：
--
通讯作者：
Guo, Minglin
中科院分区：
文献类型：
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作者：
Li, Zhenhuan;Cheng, Bowen;Guo, Minglin
考察了固载氧化钼对碳酸二甲酯(DMC)与苯酚液相酯交换合成碳酸二苯酯(DPC)的介孔催化活性。在SiMCM-41上负载MoO_3催化剂后，DPC和碳酸苯甲酯(MPC)的产率均有较大提高。采用X-射线衍射仪、氮气吸附-脱附等温线和傅立叶变换红外光谱对MoO_3/SiMCM-41催化剂进行了表征。表征结果表明，MoO_3/SiMCM-41的高活性中心是孤立的MoO_42-四面体物种和聚合的八面体氧化钼物种。MPC的生成量随反应时间的延长而增加，反应4h后逐渐下降，最高产率可达39.6%。4h后MPC产率的下降可能是由于MPC歧化生成DPC和可逆酯交换反应所致。爱思唯尔出版公司(Elsevier B.V.)
The mesoporous catalyst activities of supported molybdenum oxide for diphenyl carbonate (DPC) synthesis in liquid-phase transesterification of dimethyl carbonate (DMC) and phenol were investigated. The yields of DPC and methyl phenyl carbonate (MPC) were greatly improved when MoO3 was supported on SiMCM-41 to act as catalyst. MoO3/SiMCM-41 catalysts were characterized by X-ray diffraction (XRD), N-2 adsorption-desorption isotherms, and Fourier transform infrared (FT-IR) spectroscopy. Characterized results revealed that the high activity sites Of MoO3/SiMCM-41 were isolated MoO42- tetrahedral species and polymerized octahedral molybdenum oxide species. MPC formation increased with reaction time up to 4 h and then decreased thereafter, and maximum MPC yield achieved 39.6%. The decrease of MPC yield after 4 h might be ascribed to MPC disproportionation into DPC and reversible transesterification reaction. Published by Elsevier B.V.