国产一级a毛一级a看免费视频,久久久久久国产一级AV片,免费一级做a爰片久久毛片潮,国产精品女人精品久久久天天,99久久久无码国产精品免费了

今天給大家分享的是2014年7月份 《Catalysis Communications》上發(fā)表的一篇名為：Basicity–FAME yield correlations in metal cation modified MgAl mixed oxides for biodiesel synthesis

文章摘要如下：

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.

該文章中材料表征采用的是美國麥克儀器AutoChem 2920

詳情可參考下面鏈接：

http://www.sciencedirect.com/science/article/pii/S1566736714001174