The
thermodynamics on the direct synthesis of dimethyl carbonate
(DMC) from CO2 and CH3OH was calculated and
analyzed. Using Y(NO3)3·6H2O
as the precursor, a series of Y2O3 were prepared
through the one-pot calcination method, which were employed to catalyze
DMC synthesis. The decomposition temperature of Y(NO3)3·6H2O was measured by thermogravimetric analysis,
and Y2O3 was obtained after the precursor calcination
at desired temperatures, denoted as Y2O3-T (°C). The catalysts were characterized by X-ray diffraction,
Brunauer–Emmett–Teller method, transmission electron
microscopy, NH3/CO2 temperature-programmed desorption,
and X-ray photoelectron spectroscopy to detect the crystal phase,
surface property, particle size, acidity–basicity amounts,
and oxidation state, respectively. The characterization results indicated
that Y2O3-750 can favor the formation of moderate
acidic and basic sites and facilitate the activation of CO2 and CH3OH. The catalytic performance evaluation was experimentally
investigated, and Y2O3-750 owned the highest
DMC yield of 1.02 mmol/g·cat under 90 °C, 8 MPa, and 6 h,
which also exhibited reliable recycle ability.
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