甲醇在ZnI2催化下转化为triptane工艺的优化及催化剂再生研究：制备一种优质的航空汽油调和组分

采用间歇釜式反应器研究了甲醇在ZnI₂催化作用下转化为2,2,3-三甲基丁烷（triptane)的反应。优化了反应工艺条件并研究讨论了催化剂的失活机理及再生工艺。采用XRD,TG及XRF方法表征分析了催化剂反应前后，及催化剂再生后的物理化学性质。实验结果表明在反应温度为200^oC，初始压力0.35MPa,反应时间2h,甲醇:ZnI₂摩尔比为2:1的条件下，triptane的收率为12.2%。随着循环反应次数的增加，催化剂的催化活性降低，在失活的催化剂中有少量的I₂及ZnO形成。I元素的流失及ZnO的形成导致了催化剂活性的降低，采用HI再生催化剂并同时向原料中加入少量叔丁醇能恢复催化反应活性。叔丁醇是反应的引发剂，通过ZnI₂催化剂的重构及起始反应的引发而实现反应活性的恢复。
 

Optimum operating and regeneration parameters of ZnI2 catalyst for Methanol to triptane An ideal component of unleaded aviation gasoline

Conversion of methanol (MeOH) to 2, 2, 3-trimethylbutane (triptane) over zinc iodide（ZnI2）catalyst was investigated in a closed batch reactor. Optimum operating parameters were searched and catalyst deactivation and regeneration behaviors were discussed. The fresh, spent and regenerated catalysts were characterized by XRD, TG and XRF measurements to elucidate the related mechanism. The experiment results showed that triptane yield reached up to 12.2% at the following process parameters, including reaction temperature of 200 oC, initial pressure of 0.35 MPa, reaction time of 2 h and MeOH to ZnI2 molar ratio of 2. The catalyst was gradually deactivated after several cycle operations. A small amount of iodine was lost and a certain amount of ZnO was formed on the deactivated ZnI2 catalyst. Deactivation of the catalyst would be attributed to the reduction of ZnI2 amount, resulting from iodine loss and formation of ZnO. It is firstly pointed from our work that the deactivated catalyst could be well regenerated by a tert-butanol and hydrogen iodide (HI) make-up method, wherein the former was added as an initiator into the reaction system. The activity recovery of the deactivated (spent) catalyst may be related to the reformation of ZnI2 and acceleration of the initiation step of this reaction.