A series of ZnO-SrO mixed oxide catalysts were prepared by co-precipitation with different compositions and tested for dimethyl carbonate synthesis from urea and methanol. The catalysts were characterized by BET surface area, XRD, NH₃-TPD and CO₂-TPD. The catalyst with 1:1 mol ratio exhibited high DMC yield of 35%. The uniform distributions of moderate to strong basic sites along with considerable number of acidic sites are accountable for high activity. Different reaction parameters were also screened and best possible conditions were established. The catalyst was easily recovered and reused with consistent activity.

中文翻译：

---

锌-锶混合氧化物催化剂上甲醇和尿素合成碳酸二甲酯

通过共沉淀不同组成制备了一系列ZnO-SrO混合氧化物催化剂，并测试了由尿素和甲醇合成碳酸二甲酯的能力。催化剂的特征在于BET表面积，XRD，NH ₃ -TPD和CO ₂ -TPD。摩尔比为1∶1的催化剂显示出35％的高DMC收率。中度到强碱性位点的均匀分布以及大量的酸性位点是造成高活性的原因。还筛选了不同的反应参数，并建立了最佳可能条件。该催化剂易于回收并以一致的活性重复使用。