کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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58842 | 47175 | 2006 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis of dimethyl carbonate from propylene carbonate and methanol using CaO–ZrO2 solid solutions as highly stable catalysts Synthesis of dimethyl carbonate from propylene carbonate and methanol using CaO–ZrO2 solid solutions as highly stable catalysts](/preview/png/58842.png)
CaO–ZrO2 catalysts were prepared by coprecipitation and their catalytic performances were evaluated in the synthesis of dimethyl carbonate from propylene carbonate and methanol. The characterization by XRD, N2 adsorption, XPS and CO2–TPD indicated that Ca2+ ion substituted for Zr4+ ions in the host lattice to form homogeneous CaO–ZrO2 solid solution when Ca/(Ca + Zr) ratio changed from 0.1 to 0.3, and CaO segregated at grain boundaries with Ca/(Ca + Zr) ratio from 0.4 to 0.5. As a result, the catalysts showed different activity and stability towards the transesterification of propylene carbonate and methanol into dimethyl carbonate. The activity of catalysts was improved with increase in Ca content, whereas high stability was shown with Ca/(Ca + Zr) ratio below 0.3. The formation of homogeneous CaO–ZrO2 solid solution was responsible for the stability of catalysts.
Journal: Catalysis Today - Volume 115, Issues 1–4, 30 June 2006, Pages 107–110