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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Transesterification of dimethylcarbonate and phenol over silica supported TiO(2) and Ti-MCM 41 catalysts: Structure insensitivity

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Title
Transesterification of dimethylcarbonate and phenol over silica supported TiO(2) and Ti-MCM 41 catalysts: Structure insensitivity
Other Titles
Transesterification of dimethylcarbonate and phenol over silica supported TiO2 and Ti-MCM 41 catalysts: Structure insensitivity
Author
Joshi, Upendra A.Choi, Sun HeeJang, Jum SukLee, Jae Sung
Keywords
transesterification of dimethylcarbonate; phenol; TiO(2)/SiO(2); Ti MCM 41; linear combination of XANES; structure insensitivity
Issue Date
2008-06
Publisher
SPRINGER
Citation
CATALYSIS LETTERS, v.123, no.1-2, pp.115 - 122
Abstract
Silica-supported titanium dioxide (TiO(2)/SiO(2)) and Ti-MCM 41 catalysts have been used for transesterification of dimethylcarbonate (DMC) and phenol to methylphenylcarbonate (MPC). The structure and the chemical state of titanium species in TiO(2)/SiO(2) and Ti-MCM 41 have been investigated by means of X-ray diffraction (XRD), X-ray absorption near edge structure (XANES) for Ti K-edge and X-ray photoelectron spectroscopy (XPS). To understand the role of pore size on the activity of catalysts, different pore size silica supports (Q-series) were utilized in TiO(2)/SiO(2) catalysts. Similarly, to understand the effect of Ti symmetry on the activity of catalysts, Ti-MCM 41 was used with different Ti-loadings. It was observed that the Ti surface area was an only important factor to achieve highest activity. In case of Ti-MCM 41 catalysts, as the Ti-loading increased octahedral symmetry increased and tetrahedral symmetry decreased. But, turnover rates based on the surface Ti atoms were independent of the Ti symmetry. They are also similar to those obtained for TiO(2)/SiO(2) catalysts. Showing that transesterification of DMC and phenol over Ti-based catalysts is a structure insensitive reaction
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DOI
10.1007/s10562-008-9403-y
ISSN
1011-372X
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ECHE_Journal Papers
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