中文摘要：

通过掺杂制备了一系列多金属改性的ZSM-5催化剂,并用于丙酮和甲醇氨化合成2,6-二甲基吡啶的反应中.在固定床反应器上筛选出催化性能良好的催化剂6%Pb-0.5%Fe-0.5%Co/ZSM-5（200）,探讨了过渡金属掺杂的促进作用,并考察了反应温度、氨醇比、酮醇比、水含量和停留时间对反应性能的影响.结果表明,该催化剂在常压、450°C、氨醇摩尔比2：1、丙酮与甲醇摩尔比2：1、水含量40%和停留时间5.5s的条件下,反应20h时,丙酮转化率为67.6%,2,6-二甲基吡啶收率可达40.3%.在上述条件下连续反应42h后,催化剂性能有所下降,此时2,6-二甲基吡啶收率降至23%.利用空气氧化法对催化剂进行在线再生,可使催化剂性能基本得到恢复.同时采用X射线衍射、N2吸附和吡啶吸附红外光谱等方法对催化剂失活原因进行了分析.

英文摘要：

A series of modified ZSM-5 catalysts for 2,6-lutidine synthesis through catalytic amination of acetone and methanol were pre-pared by a transition metal doping method.The catalyst 6%Pb-0.5%Fe-0.5%Co/ZSM-5（200） with good performance in the reaction was selected on a fixed-bed reactor.The reasons for the improvement of the catalyst performance by doping transition metals into ZSM-5 were discussed.The effects of reaction temperature,molar ratio of ammonia to methanol,composition of raw materials,and residence time on the catalytic performance of the catalyst were studied.Acetone conversion and 2,6-lutidine yield reached 67.6% and 40.3%,respectively,when the reaction was run at 450 °C for 20 h under the conditions of atmospheric pressure,the molar ratio of ammonia to acetone to methanol of 2：2：1,the volume content of water of 40%,and the residence time of 5.5 s.With the time extension,the performance of the catalyst got dete-rioration gradually and the yield of 2,6-lutidine dropped to 23% after a time on stream of 42 h.The catalyst activity could be recovered largely by air oxidation on line.The possible reasons for the deterioration of the catalyst performance were discussed.