用表面反应改性法合成了MoOCl/SiO2催化剂.分析测定结果表明:钼(Ⅴ)离子在SiO2表面以双齿配位形式与表面氧键合;双核钼(Ⅴ)间以μ-双氯基桥联.用IR,TPD,TPSR-MS和TPSR-IR研究了MoOCl/SiO2催化剂对CO2与EO(环氧乙烷)的化学吸附特性及催化合成EC(碳酸乙烯酯)的反应性能.结果表明:CO2在催化剂表面形成桥式吸附态,桥基配体是表面反应的活性中心;EO在催化剂表面也形成桥式吸附态;催化剂对CO2与EO合成EC有良好的催化性能,在140℃条件下经过渡态而定向转化为EC.
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