催化作用
甲醇
化学
磺酸
浸出(土壤学)
油酸
产量(工程)
硫黄
摩尔比
碳纤维
有机化学
核化学
材料科学
复合材料
土壤水分
土壤科学
冶金
复合数
生物化学
环境科学
作者
Bingxin Zhang,Ming Gao,Jiayu Geng,Yongqiang Cheng,Xiaona Wang,Chuanfu Wu,Qunhui Wang,Shu Liu,Siu Ming Cheung
标识
DOI:10.1016/j.renene.2020.09.076
摘要
In this study, catalytic activity and deactivation mechanism of a carbon-based solid-acid catalyst in the esterification of oleic acid and methanol were investigated. The experimental results showed that the S150-4 catalyst, prepared by sulphonating at 150 °C for 4 h, yielded the highest sulfonic acid density. The conversion yield reached 97.98% under the optimum esterification conditions (i.e. catalyst loading, 10 wt%; methanol/oleic acid molar ratio, 8:1; reaction temperature, 65 °C; reaction time, 8 h) and decreased to 79.19% after four cycles. In the first batch of esterification, the formation of sulfonic esters was the main reason for the deactivation of the catalyst, whereas the leaching of sulphur was the main contributor in the second to fourth batches. Therefore, it is believed that reducing the leaching of sulphur and the formation of sulfonic esters by changing the addition method of methanol is an effective method to extend the service life of the catalyst.
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