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学科主题: 物理化学
题名: On the product formation mechanism of MTO conversion over different structure zeolite catalysts
作者: Li JZ(李金哲) ;  Wei YX(魏迎旭) ;  He YL(何艳丽) ;  Qi Y(齐越) ;  Tian P(田鹏) ;  Chang FX(常福祥) ;  Sun XD(孙新德) ;  Liu ZM(刘中民)
会议名称: 16th International Zeolite Conference joint with the 7th International Mesostructured Materials Symposium
会议日期: 2010-7-4
出版日期: 2010-07-04
会议地点: Italy
通讯作者: 刘中民
部门归属: 十二室
主办者: The International Zeolite Association and the International Mesostructured Material Association
摘要: Methanol can be converted into olefins, aromatics and alkanes over acidic zeolites. The product distribution could be altered on the choice of zeolites with different pore structure and acidity. For example, when SAPO-34 was employed as the catalyst, ethene and propene were the most important products with comparable selectivity. The ethene and propene formation mechanism over SAPO-34 was believed to be the same, i.e. hydrocarbon pool mechanism. It was further proposed that the product shape selectivity dominates the reactions [1]. When ZSM-5 was employed, higher C3=/C2= ratio was observed and this was attributed to the different formation mechanism of ethene and propene [2]. In our study, it was found that even higher C3=/C2= ratio than that over ZSM-5/ZSM-22 could be obtained over fresh SAPO-34 catalyst. This phenomenon was conflicted with the product shape selectivity proposed before [1]. On the other hand, in the MTO process the alkanes were unwanted byproducts which decrease the usage efficiency of methanol and also increase the cost for separating them from the valuable alkenes. However, the detailed formation mechanism of alkanes in MTO reaction was rarely studied. In this study, the detailed formation mechanism of individual product was investigated on the pulse reaction system combined with 13C labeling technique.
语种: 中文
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/114388
Appears in Collections:中国科学院大连化学物理研究所_会议论文

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Recommended Citation:
Li JZ,Wei YX,He YL,et al. On the product formation mechanism of MTO conversion over different structure zeolite catalysts[C]. 见:16th International Zeolite Conference joint with the 7th International Mesostructured Materials Symposium. Italy. 2010-7-4.
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