کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
210859 | 461730 | 2011 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Transesterification of vegetable oils over a phosphazenium hydroxide catalyst incorporated onto silica Transesterification of vegetable oils over a phosphazenium hydroxide catalyst incorporated onto silica](/preview/png/210859.png)
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 0.2 g per 4.8 ml 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.
Journal: Fuel Processing Technology - Volume 92, Issue 1, January 2011, Pages 126–131