High selectivity to diphenyl carbonate synthesized via transesterification between dimethyl carbonate and phenol with C₆₀-doped TiO₂

Abstract

An environmentally friendly heterogeneous catalyst, C₆₀-doped TiO₂(denoted as C₆₀-TiO₂), was prepared and firstly used to catalyze the synthesis of diphenyl carbonate(DPC) via the transesterification of phenol and dimethyl carbonate(DMC). The characterization results of FTIR, XRD, XPS, SEM, TEM and digital optical microscope(MIC) show that C₆₀ promotes the dispersion of TiO₂ and the prepared conditions affect the dispersion and the electron density of Ti species. The C₆₀-TiO₂-8[n(Ti):n(C₆₀)=8:1] prepared with toluene and calcined at 200 °C exhibits the best catalytic performance. The DPC selectivity of 86.5% attained over C₆₀-TiO₂-8 was much higher than that(about 50%) attained over Ti-based catalysts reported, which was originated from the electronic effect of C₆₀ and the efficient dispersion of Ti species by C₆₀. The phenol conversion slowly decreased from 34.4% to 26.7% after four consecutive runs due to the leach of Ti species. It also suggested that the C₆₀ could relieve the leach of Ti species compared with other Ti-based catalysts reported. Moreover, C₆₀-TiO₂-8 exhibited excellent catalytic behavior for disproportionation of methyl phenyl carbonate(MPC) with high DPC selectivity.

Keywords

C₆₀ / TiO₂ / Diphenyl carbonate / Transesterification

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