کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
49666 | 46759 | 2014 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Basicity–FAME yield correlations in metal cation modified MgAl mixed oxides for biodiesel synthesis Basicity–FAME yield correlations in metal cation modified MgAl mixed oxides for biodiesel synthesis](/preview/png/49666.png)
• Zn2 +, Co2 +, Fe3 + and La3 + modified Mg–Al oxides were synthesized.
• Basicity of catalysts improved by the metal cation modification.
• Effects of Fe3 + and La3 + on the basicity of catalysts are stronger than Zn2 + and Co2 +.
• Increasing catalyst basicity advanced FAME yield.
• La3 + modified catalyst exhibited highest activity in transesterification.
In this paper Zn2 +, Co2 +, Fe3 + and La3 + were respectively introduced into Mg3Al1 mixed oxides to prepare Mg1Zn2Al1, Mg1Co2Al1, Mg3Al0.6Fe0.4 and Mg3Al0.6La0.4 oxides by calcinations at 773 K. The XRD, XPS, BET, ICP-AES and CO2-TPD characterizations of samples exhibited that the effects of the substitution of trivalent cations (Fe3 +, La3 +) for Al3 + on the basicity of samples were stronger than the substitution of divalent cations (Zn2 +, Co2 +) for Mg2 + because of high O2 − concentration which were coincident with the FAME yield for these catalysts. La3 + modified catalyst exhibited highest activity in transesterification.
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Journal: Catalysis Communications - Volume 52, 5 July 2014, Pages 1–4