甲苯、甲醇在碱性沸石上侧链烷基化反应的研究 Ⅱ.X型沸石交换度对侧链反应的影响

以催化剂的评价和表征结果为依据，探讨了交换度、总碱度和总产率三者的关系。认为随着沸石中钾离子交换度的提高，分子筛表面总碱度急剧上升，甲苯、甲醇的侧链反应性能逐渐增强，但总收率存在一峰值，这说明苯乙烯和乙苯的总产率不是无限制地随着沸石阳离子交换度的提高而提高。总碱度与总收率成正比关系，总碱量有一最大值，苯乙烯和乙苯的总产率有一峰值，最大值和峰值是相对应的。

Investigation on side chain alkylation of toluene with methanol over a basic zeolite catalystⅡ.Effect of exchange degree on the alkylation

ased　on　the　results　from　evaluation　and　characterization　of　a　K+　 exchanged　zeolite　catalyst　for　side chain　alkylation　of　toluene　with　methanol,　the　effect　of　K+　exchange　degree　is　investigated　on　the　total　basicity　of　the　zeolite　surface　and　the　catalytic　activity　of　the　zeolite　for　alkyla tion.　It　is　found　that,　with　an　increase　in　K+　exchange　degree,　the　total　surface　basicity　is　significantly　increased　and　the　performance　of　side chain　alkylation　is　gradually　enhanced.　There　is　a　maximum　in　total　yield　of　styrene　and　ethylbenzene,　showing　that　the　total　yield　will　not　increase　unlimitedly　with　the　increase　of　exchange　degree.　At　an　optimal　value　of　K+　exchange　degree,　both　the　total　basicity　and　total　yield　reach　their　maximum,　indicating　a　positive　effect　of　the　total　basicity　on　the　total　yield.