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采用离子交换法、浸渍法和焙烧分解法制备了x%K2O/KLSX(x=0,1,2,3,4)催化剂,KLSX上的超强碱性位K2O通过KNO3分解制得.考察了x%K2O/KLSX的甲苯甲醇侧链烷基化反应催化性能及超强碱性位K2O对反应的影响.超强碱性位K2O可以更好的极化甲苯甲基,以及催化甲醇转化为烷基化中间体,甚至完全分解为CO和H2.KLSX和1%K2O/KLSX因碱性较弱所以活性较低,3%K2O/KLSX和4%K2O/KLSX因含超强碱性位太多和可利用L酸性位太少,其活性也很低.相比之下,2%K2O/KLSX具有足够量的弱L酸位来吸附甲苯,以及适当强度的碱性位来转化甲醇和活化甲苯甲基,因此具有较高的催化甲苯甲醇侧链烷基化反应活性.
The catalyst X% K2O / KLSX (x = 0,1,2,3,4) was prepared by ion exchange, impregnation and calcination decomposition. The super basicity K2O on KLSX was decomposed by KNO3. x% K2O / KLSX Catalytic Performance of Side-chain Alkylation of Methanol and Effect of Super-basic K2O on Reaction The super-basicity K2O can polarize toluene methyl and catalyze the conversion of methanol to alkane Alkylated intermediates and even completely decomposed into CO and H2. KLSX and 1% K2O / KLSX are less active due to their weaker alkalinity, and 3% K2O / KLSX and 4% K2O / KLSX contain too much In contrast, 2% K2O / KLSX has a sufficient amount of weak L acid sites to adsorb toluene and a suitable strength alkaline site to convert methanol and activated toluene Methyl group, so it has high catalytic side chain alkylation reaction of toluene.