论文部分内容阅读
本文研究了在甲醇与甲苯侧链的烷基化反应中,K_2B_4O_7(Ⅰ)与H_3BO_3-MgO(Ⅱ)对X型沸石催化剂的改性规律。用Ⅰ对KX沸石进行改性,当每100gKX沸石含3.12×10~(-2)mol K_2B_4O_7时,甲醇的选择性较好;用Ⅱ进行改性,每100gKX沸石含0.8mol MgO及0.19mol H_3BO_3时,产品中苯乙烯的含量及苯乙烯与乙苯的产率都较高。当采用H_3BO_3-MgO-Cs X型催化剂时,甲醇转化率和选择性分别达到88%及27%,苯乙烯及乙苯的产率达到0.63(g/gCat·h)。同时对X型沸石催化剂失活进行了研究,认为除了结焦导致失活外,反应过程中产生的水蒸汽使沸石的结构和性能受到破坏,亦导致失活。
In this paper, the modification of X-type zeolite K_2B_4O_7 (Ⅰ) and H_3BO_3-MgO (Ⅱ) in the alkylation of methanol with toluene was studied. When KX zeolite was modified with Ⅰ, the selectivity of methanol was better when the content of KX zeolite was 3.12 × 10 ~ (-2) mol K_2B_4O_7 per 100g, and the content of zeolite was 0.8mol MgO and 0.19mol H_3BO_3 , The content of styrene in the product and the yield of styrene and ethylbenzene are both high. When H_3BO_3-MgO-Cs X catalyst was used, the methanol conversion and selectivity reached 88% and 27% respectively, and the yield of styrene and ethylbenzene reached 0.63 (g / gCat · h). At the same time, the deactivation of X-type zeolite catalyst was studied. It was found that in addition to the deactivation caused by coke formation, the steam generated during the reaction destroyed the structure and properties of the zeolite and also resulted in inactivation.