Catalytic Properties of Lithium-Doped ZnO Catalysts Used for Biodiesel Preparations

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• 作者：Wenlei Xie ; Zhenqiang Yang ; Hong Chun
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2007
• 出版时间：November 21, 2007
• 年：2007
• 卷：46
• 期：24
• 页码：7942 - 7949
• 全文大小：113K
• 年卷期：v.46,no.24(November 21, 2007)
• ISSN：1520-5045

文摘

Biodiesel produced by the transesterification of vegetable oils or animal fats with short-chain alcohols (typicallymethanol) is a promising alternative fuel for diesel engines, because of the limited resources of fossil fuelsand environmental concerns. In this work, Li/ZnO catalysts were prepared using an impregnation methodfollowed by calcinations, and then they were tested for soybean oil transesterification. It was determined thatLi/ZnO catalysts exhibited good catalytic activities, and the catalytic performance was greatly dependent on(i) the loading amount of lithium and (ii) the calcination temperature. This Li/ZnO catalyst, at an amount of5 wt %, resulted in a soybean oil conversion of 96.3% in 3 h using a reflux of methanol and a 12:1 molarratio of methanol to oil. Moreover, the catalyst was characterized using X-ray diffractometry (XRD), X-rayphotoelectron spectroscopy (XPS), infrared (IR) spectroscopy, thermogravimetry-differental thermal analysis(TG-DTA), and the Hammett titration method. It was shown that the activity of the catalysts for thetransesterification reaction is closely related to their basic properties.