作　　者： ; ;

机构地区： 华南理工大学化学与化工学院

出　　处： 《合成橡胶工业》 1997年第3期138-142,共5页

摘　　要： 在常压固定床流态化反应装置上，考察了双碱金属促进的Ｌａ２Ｏ３催化剂在甲苯氧化甲基化反应中的催化活性、选择性。结果表明：双碱金属钠、钾促进的Ｌａ２Ｏ３体系是良好的甲苯氧化甲基化制苯乙烯催化剂。其中用质量分数各为７％的ＮａＯＨ、ＫＯＨ促进的Ｌａ２Ｏ３催化体系，在反应温度为７５０℃、空速为１３．７Ｌ／（ｇ·ｈ）、原料气分压Ｃ７Ｈ８∶ＣＨ４∶Ｏ２∶Ｎ２＝１∶１１．２∶２．１∶１０．４条件下，甲苯单程转化率为４６．２％，Ｃ８的选择性为６５．９％，Ｃ８的收率为３０．５％。该催化剂稳定性好，反应６０ｈ，无积碳现象。 The catalytic activity and selectivity of oxidative methylation of toluene with methane to ethylbenzene were investigated over various alkali metal compounds promoted La2O3 catalysts.The most effective catalytic systems were obtained with La2O3 promoted with the bialkali metal compound of 7% NaOH and 7% KOH.The selectivity of C8(65.9%),the yield of C8(30.5%)and the conversion of toluene(46.2%)were obtained over aforementioned catalyst at 750 ℃,at space velocity 13.7 L /(g·h),at C7H8∶CH4∶O2∶N2 pressure ratio 1∶11.2∶2.1∶10.4.The performance of the catalyst remained almost unchanged for 60 h,and no coke deposits were observed on the catalyst after the reaction.

关 键 词： 氧化镧 碱金属 甲苯 苯乙烯 氧化甲基化 催化剂

领　　域： [化学工程]