Abstract A series of carbon-based solid acid catalysts are synthesized from bamboo through the approach of partial carbonization and sulfonation, where predecessor of the catalyst is activated by phosphoric acid in advance. After carbonization at 350 °C for 2 h and sulfonation at 105 °C for 4 h, the catalyst gained amorphous carbon structure with large surface area of 1208 m2 g−1 and strong acid density of 1.28 mmol g−1. The biodiesel yield reached 97.3% with the optimum esterification conditions. Due to the leaching of SO3H groups, after fourth reused cycle of the catalyst, the biodiesel yield declines to 83.7%.

中文翻译：

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大表面积碳基固体酸催化酯化反应制备生物柴油的制备

摘要 以竹子为原料，通过部分碳化和磺化的方法合成了一系列碳基固体酸催化剂，催化剂的前身预先用磷酸活化。在350°C碳化2小时和105°C磺化4小时后，催化剂获得了具有1208 m2 g-1大表面积和1.28 mmol g-1强酸密度的无定形碳结构。在最佳酯化条件下生物柴油收率达到97.3%。由于SO3H基团的浸出，催化剂经过第四次重复使用循环后，生物柴油产率下降到83.7%。