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Synthesis of dimethyl carbonate from CO2 and methanol over a hydrophobic Ce/SBA-15 catalyst

机译：在疏水Ce / SBA-15催化剂上由CO2和甲醇合成碳酸二甲酯

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A series of Ce/SBA-15 catalysts with different degrees of hydrophobicities were prepared via a post-grafting method and used for the direct synthesis of dimethyl carbonate (DMC) from CO _(2) and methanol. The Ce/SBA-15-6 catalyst exhibited the highest DMC yield of 0.2%, which was close to the equilibrium value under the reaction conditions of 130?°C, 12 h and 12 MPa. The catalysts were characterized via XRD, BET, FT-IR, solid-state ~(29) Si MAS NMR, CA, TEM, XPS and NH _(3) /CO _(2) -TPD; the results indicated that the hydrophobicity of the catalysts facilitated the creation of oxygen vacancies, which could act as Lewis acids to activate methanol. Higher amounts of moderate acid sites led to higher yields of DMC. In addition, the hydrophobicity of the catalysts could also reduce the adsorbed water on their surface and increase the DMC yield while shortening the reaction time.
机译：通过后接枝方法制备了一系列具有不同疏水度的Ce / SBA-15催化剂，并用于由CO_（2）和甲醇直接合成碳酸二甲酯（DMC）。 Ce / SBA-15-6催化剂的最高DMC收率为0.2％，在130？C，12 h和12 MPa的反应条件下接近平衡值。通过XRD，BET，FT-IR，固态〜（29）Si MAS NMR，CA，TEM，XPS和NH_（3）/ CO_（2）-TPD表征催化剂。结果表明，催化剂的疏水性促进了氧空位的产生，其可以作为路易斯酸来活化甲醇。较高量的中等酸性位点导致较高的DMC收率。另外，催化剂的疏水性还可以减少其表面上吸附的水并增加DMC收率，同时缩短反应时间。

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