Direct esterification of olefins: The challenge of mechanism determination in heterogeneous catalysis
作者:Jeffrey C. Gee、Shane Fisher
DOI:10.1016/j.jcat.2015.08.010
日期:2015.11
The reversible, direct esterification of 1-hexene and 1-octene with heptanoic acid on Amberlyst® 15 (dry) was studied at 75 °C to determine kinetics and mechanism. The forward surface reaction occurred by an Eley–Rideal mechanism, in which adsorbed olefin reacted with bulk phase heptanoic acid; the reverse reaction, ester decomposition, required just one surface site. While detailed studies pointed
在75°C下研究了1-己烯和1-辛烯与庚酸在15(干燥)上可逆的直接酯化反应,以确定动力学和机理。前表面反应是通过Eley-Rideal机理发生的,其中吸附的烯烃与本体相庚酸反应。逆反应,酯分解,只需要一个表面位点。尽管详细的研究指出了Eley-Rideal机制,但Langmuir-Hinshelwood机理几乎可以与Eley-Rideal机制一样好,可再现在数小时的反应中观察到的动力学数据。作者得出的结论是,粗略的调查可以支持Langmuir-Hinshelwood机制,而详细的调查可以支持此系统中的Eley-Rideal机制。