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	NaBr/KY催化剂在甲苯氧化甲基化反应中的稳定性; The Stability with Time-on-Stream of NaBr-Promoted KY Zeolite Catalyst for the Oxidative Methylation of Toluene with Methane
	周灵萍 ; 李伟 ; 陶克毅 ; 李赫咺 ; 李宣文
	2002
关键词	KY沸石 甲苯 甲烷 氧化甲基化 稳定性 KY zeolite toluene methane oxidative methylation stability
英文摘要	考察了NaBr/KY催化剂的甲苯氧化甲基化反应(OMT)反应稳定性,经过50 h的OMT反应结果表明,在反应初期,甲苯转化率、总C8选择性均有不同程度的下降,之后趋于稳定.在总C8产物中,苯乙烯的选择性随着反应的进行呈下降趋势,而乙苯的选择性与苯乙烯相比呈相反的变化趋势.此外,利用XRD、骨架IR、XPS对反应前后的催化剂结构进行了研究,发现催化剂经过50 h的OMT反应,分子筛的结构遭到了部分破坏,但其基本骨架仍保留.; The stability with time-on-stream of NaBr-promoted KY zeolite catalyst for the oxidative methylation of toluene with methane has been investigated. The results showed that during 50 h of reaction, the toluene conversion and the total C-8 selectivity decreased fast at the first and then basically remained unchanged, they kept at about 35% and 65% - 70% respectively. The selectivity of styrene decreased while the selectivity of ethyl benzene increased during the reaction process. This result was ascribed to the estimation that the styrene was formed by the dehydrogenation of ethyl benzene and the dehydrogenation activity decreased in the reaction process. In addition, the structure of the catalyst used was also studied by XRD, IR and XPS. It was found that the zeolite catalyst suffered dealumination, elimination of KBr and partial destruction of structure but the zeolite framework still retained.; 国家自然科学基金; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000178709800011&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 0; 10; 916-919; 18
语种	中文
出处	万方 ; SCI ; http://d.g.wanfangdata.com.cn/Periodical_wlhxxb200210010.aspx
出版者	物理化学学报
内容类型	其他
源URL	[http://hdl.handle.net/20.500.11897/78252]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	周灵萍,李伟,陶克毅,等. NaBr/KY催化剂在甲苯氧化甲基化反应中的稳定性, The Stability with Time-on-Stream of NaBr-Promoted KY Zeolite Catalyst for the Oxidative Methylation of Toluene with Methane. 2002-01-01.

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