Transesterification of vegetable oils over a phosphazenium hydroxide catalyst incorporated onto silica
2011
Kim, Mi-Jin | Kim, Mi-Young | Kwon, O Zoon | Seo, Gon
The catalytic activity of a phosphazenium hydroxide (PzOH) catalyst incorporated onto silica (PzOH/SiO₂) was investigated in the transesterification of vegetable oils with methanol. The PzOH stably incorporated onto silica (SiO₂) maintained its basicity and converted methanol molecules to methoxide ions. The PzOH/SiO₂ catalyst exhibited high activity in the transesterification of palm, corn, grape seed, and soybean oils (S-oil) with methanol, achieving ~90% conversion at 75°C with a catalyst loading of 0.2g per 4.8ml of S-oil. Although the accumulation of organic materials on PzOH/SiO₂ reduced its activity, this accumulation was effectively removed by washing with methanol. The high activity of PzOH/SiO₂ was responsible for its strong basicity and for the free mobility of the PzOH moiety.
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