Abstract: Nonyldiphenylamine，an antioxidant，was synthesized by the reaction of diphenylamine with nonene under the catalysis of a solid superacid SO42-/TiO2. Several factors affecting the diphenylamine conversion and the selectivity for nonyldiphenylamine were investigated，including the calcination temperature of solid superacid，the reaction temperature and the amounts of catalyst，diphenylamine and nonene. The diphenylamine conversion reached to 97.3% with a selectivity for the aimed product，nonyldiphenylamine，of 86.4% when the superacid was calcinated at 550 ℃，where the reaction was carried out at 140 ℃ for 12 h with 3.50 g of catalyst，5.07 g of diphenylamine and 15.12 g of nonene. When the catalyst was reused for six times，the diphenylamine conversion still remained as 92.3% with the selectivity for nonyldiphenylamine of 80.2%. The catalyst deactivation mainly resulted from the carbon deposition and the loss of SO42-.

摘要： 以固体超强酸SO42-/TiO2为催化剂，通过二苯胺与壬烯发生烷基化反应制备抗氧剂壬基二苯胺。研究了固体超强酸的煅烧温度、催化剂量、壬烯与二苯胺的比例、反应温度、反应时间和催化剂稳定性对二苯胺的转化率和二壬基二苯胺选择性的影响。结果表明，当固体超强酸的煅烧温度为550℃、催化剂量为3.50g、壬烯为15.12 g、 二苯胺为5.07 g、反应温度为140 ℃时，反应12 h，二苯胺的转化率达到97.3%，目标产物二壬基二苯胺的选择性为86.4%。催化剂重复使用6次，二苯胺的转化率仍达到92.3%，二壬基二苯胺的选择性为80.2%。催化剂失活的主要原因为积炭和SO42-的流失。