Abstract: Decarboxylation of biodiesel in a tubular reactor with the internal diameter of 16 mm and the length of 600 mm was studied. Decarboxylation of biodiesel was conducted under nitrogen atmosphere at normal pressure over the supported molybdenum on activated carbon. The effects of reaction temperature, feeding velocity, catalyst amount, metal loading rate were investigated on the decarboxylation of biodiesel. The optimal condition was achieved that the reaction temperature is 340℃, the dosage of Mo/C is 40 g, the metal loading is 40% and the feeding velocity of fatty acid methyl esters is 0.3258 g·min^-1. It was achieved about 100% conversion of fatty acid methyl esters and 62.35% yield of liquid hydrocarbon, in which alkane with carbon number of 15,17 and aromatic hydrocarbon with carbon number of 17 were the major products. The percentage of solid products, liquid products and gas products were 8.73%, 63.04% and 28.23% respectively. The life of Mo/C catalyst was investigated under suitable condition and the reason of deactivation was also analyzed.

Key words: tubular reactor, biodiesel, decarboxylation, normal pressure, Mo catalyst

摘要： 研究在内径为16 mm、长度为600 mm的管式反应器中，利用负载型Mo/C催化剂，常压下催化生物柴油脱羧的效果。主要考察了温度、进料速率、催化剂用量、金属负载率等因素对生物柴油脱羧的影响。得到生物柴油脱羧去氧的适宜条件：反应温度为340℃，Mo在活性炭上的负载率为40%，催化剂用量为40 g，进料速率为0.3258 g·min^-1，在此条件下，酯转化率接近100%，液态烃产率为62.35%，液态产物中C15烷烃、C17烷烃和芳香烃为主要组分。固态、液态、气态产物分布分别为8.73%、63.04%和28.23%。实验研究了在较适宜的条件下Mo/C催化剂的寿命，并且分析了其失活的原因。

关键词: 管式反应器, 生物柴油, 脱羧, 常压, Mo催化剂