Abstract
TiO2–RGO composites were prepared and used as efficient heterogeneous catalysts for the transesterification of dimethyl carbonate with phenol. Transmission electron microscopy images demonstrated that the RGO could remarkablely improve the dispersion of TiO2. X‐ray photoelectron spectroscopy showed that RGO could change the chemical states of Ti species. Py-IR and Py-TPD results indicated the addition of RGO led to the increase of medium Lewis acid sites of TiO2, which are positive for the transesterification reaction. The TiO2–RGO composite with 50 wt% RGO exhibited a remarkable catalytic performance for the transesterification of dimethyl carbonate with phenol to diphenyl carbonate. Under the optimized conditions, the 53.5% phenol conversion and 99.9% transesterification selectivity were achieved. This phonel conversion of 53.5% could be compared with the result of homogeneous catalysts. RGO has been an excellent structural and electronic promoter in TiO2–RGO composites.
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Acknowledgements
Financial support for this work from the National High Technology Research and Development Program of China (863 program, No. 2013AA031703), the Science and Technology Support Program of Sichuan Province (No. 2013GZX0135) and the Science and Technology Innovation Program for Youth Team of Sichuan Province (No. 2013TD0010) are greatly acknowledged.
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Yang, H., Xiao, Z., Qu, Y. et al. The role of RGO in TiO2–RGO composites for the transesterification of dimethyl carbonate with phenol to diphenyl carbonate. Res Chem Intermed 44, 799–812 (2018). https://doi.org/10.1007/s11164-017-3135-9
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DOI: https://doi.org/10.1007/s11164-017-3135-9