Formation of methyl methacrylate from methyl propionate and methanol
Formation of methyl methacrylate from methyl propionate and methanol
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DOI：
10.1016/j.cattod.2005.10.053
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发表时间：
2006-02
期刊：
影响因子：
5.3
通讯作者：
M. Ai
中科院分区：
文献类型：
--
作者：
M. Ai
研究了丙酸甲酯（MP）与甲醇在无甲醛存在下的气相反应生成甲基丙烯酸甲酯（MMA）的过程。二氧化硅负载的CsOH掺杂少量的银Ag被认为是最好的催化剂。最佳Ag/Cs/Si原子比为4-10/20-25/1000。当反应在进料中不存在氧的情况下进行时，在反应开始时主要产物是异丁酸甲酯（MIB）;没有获得MMA。随着反应时间的增加，MIB的生成量下降，MMA的生成量增加，出现一个最大值，然后逐渐下降。在氧存在下进行反应的情况下，催化活性稳定。随着氧气量的增加，MMA的产率增加，而选择性下降。少量Ag-Cs/SiO2催化剂和大量Cs/SiO2催化剂的组合使用进一步提高了催化剂的性能。
The formation of methyl methacrylate (MMA) was studied in a vapor-phase reaction between methyl propionate (MP) and methanol without using any sources of formaldehyde. Silica-supported CsOH doped with a small amount of silver Ag was found to be the best catalyst. The optimum Ag/Cs/Si atomic ratio was 4–10/20–25/1000. When the reaction was performed in the absence of oxygen in the feed, the main product was methyl isobutyrate (MIB) at the beginning of the reaction; MMA was not obtained. As the time-on-stream increased, the formation of MIB fell, while that of MMA increased, showed a maximum, and then decreased gradually. In the case of the reaction performed in the presence of oxygen, the catalytic activity was stable. As the amount of oxygen increased, the yield of MMA increased, while the selectivity fell. The performances were further improved by the combination of a small amount of Ag–Cs/SiO2catalyst and a large amount of Cs/SiO2catalyst.