甲苯氧化甲基化制苯乙烯新型催化剂的开发

New Catalysts Used in Oxidative Methylation of Toluene with Methane

采用共沉淀和浸渍法，制备了一系列双碱金属促进的双碱土金属氧化物催化剂，发现其在甲苯氧化甲基化制苯乙烯反应中表现出优异的性能。特别是Ｎａ＋－Ｋ＋／ＭｇＯ－ＣａＯ（５：５：４５：４５ｍｏｌ％），在反应温度７５０℃，空速１４０００ｍｌ／ｇ·ｈ，原料气配比ＣＨ４：Ｏ２：Ｃ７Ｈ８：Ｎ２＝１１．２：２．１：１：１０．４时，可实现Ｃ８（苯乙烯和乙苯）单程收率２３．３％。６０ｈ的寿命试验表明，该催化剂具有良好的稳定性。

he bialkali-metal-compounds-promoted bialkaline earth metal oxides were prepared by coprecipitation and impregnation methed: It was found that the samples had excellent performances in the oxidative methylation of toluene with methane to styrene. The experiment' have been carried out under atmospheric pressure,at 750℃,with a CH4: O2: C7H8: N2 partial pressure ratio of 11. 2: 2. 1: 1: 10. 4 and at a space velocity of 14000ml/g· h. The highest C8 hydrocarbon yield (23. 3 % ) was obtained over Na+-K+ /MgO-CaO(5: 5: 45: 45mol % ). During 60h of catalyst life test,the catalyst showed very good stability.