Cs Promoted Triglyceride Transesterification Over MgO Nanocatalysts

Cs Promoted Triglyceride Transesterification Over MgO Nanocatalysts
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Cs 在 MgO 纳米催化剂上促进甘油三酯酯交换反应

DOI:
10.1007/s11244-010-9461-4
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发表时间:
2010
影响因子:
3.6
通讯作者:
Montero J
Montero J
中科院分区:
化学4区
文献类型:
--
作者:
Montero J

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通过电子显微镜、CO2化学吸附、X射线衍射仪和X射线光电子能谱分析了Cs对纳米氧化镁晶体结构和碱度的影响。在超临界条件下,通过共沉淀法掺入铯可以得到表面碱位密度和强度都较高的Cs2 Mg(CO3)2纳米晶。湿法浸渍对氧化镁纳米晶的改性效果较差。与未掺杂的氧化镁和均相的碳酸铯催化剂相比,共沉淀物中Cs和Mg组分之间的强烈协同作用显著提高了三丁酸甘油酯与甲醇的酯交换反应的速率。掺Cs氧化镁的在线失活反映了由于Cs的有限溶解,高活性Cs2 Mg(CO3)2相的表面沉积和高活性相的损失。
The influence of Cs on the structure and basicity of nanocrystalline MgO was assessed via electron microscopy, CO2chemisorption, XRD and XPS. Caesium incorporation via co-precipitation under supercritical conditions generates Cs2Mg(CO3)2nanocrystallites with an enhanced density and strength of surface base sites. Wet impregnation proved less effective for modifying MgO nanocrystals. A strong synergy between Cs and Mg components in the co-precipitated material dramatically enhanced the rate of tributyrin transesterification with methanol relative to undoped MgO and homogeneous Cs2CO3catalysts. On-stream deactivation of Cs-doped MgO reflects heavy surface carbon deposition and loss of the high activity Cs2Mg(CO3)2phase due to limited Cs dissolution.
烷烃制烯烃的高效催化剂:高表面积纳米级混合氧化物簇的溶胶-凝胶合成
DOI: --
发表时间: 2006
期刊:
影响因子: --
作者:
C. Trionfetti;I. Babich;K. Seshan;L. Lefferts
通讯作者: L. Lefferts
DOI: 10.1039/b814357a
发表时间: 2009-01-01
期刊: GREEN CHEMISTRY
影响因子: 9.8
作者:
Montero, Janine M.;Gai, Pratibha;Lee, Adam F.
通讯作者: Lee, Adam F.