MgO/HZSM-5中MgO分散状态和催化性能的关系

doi:10.3866/PKU.WHXB20011102

CORC > 北京大学 > 化学与分子工程学院

	MgO/HZSM-5中MgO分散状态和催化性能的关系; Correlations betwween the Disspersion State OD Mgo and Caralytic Behavior of Mgo/HZSM-5
	王珏 ; 赵璧英 ; 谢有畅
刊名	物理化学学报
	2001
关键词	择形催化表面修饰甲苯甲基化 HZSM-5 MgO shape-selectivity surface modification toluene methylation HZSM-5 MgO
DOI	10.3866/PKU.WHXB20011102
英文摘要	以硝酸镁、醋酸镁为前身物,通过浸渍法制备了不同系列MgO/HZSM-5催化剂,用XRD、XPS方法研究了MgO在HZSM-5上的分散状态,用NH3-TPD方法考察了催化剂的酸性,用常压连续流动微型反应装置考察MgO/HZSM-5在甲苯甲醇烷基化反应中的催化性能.发现前身物不同,MgO在HZSM-5上的分散状态也不同,催化剂的活性和选择性与MgO分散状态密切相关.MgO负载量相同时,在以硝酸镁为前身物制备的催化剂中,MgO在HZSM-5内外表面均有分散,催化剂的对位选择性较高,而活性较低;在以醋酸镁为前身物制备的催化剂中,MgO较多分布在HZSM-5外表面,催化剂的活性较高,但选择性较低.使用醋酸镁为前身物,通过二次浸渍和高温水汽处理,适当改变MgO在分子筛表面的分布并使孔道窄化,可在活性降低较少的情况下显著提高催化剂对二甲苯选择性.; Two series of MgO/HZSM-5 catalysts were prepared by impregnating HZSM-5 with solution of Mg(NO3)(2) and Mg(CH3COO)(2). The structures of the samples were characterized by XRD and XPS, and the acidity was determined by NH3-TPD. The catalytic behavior of MgO/HZSM-5 in the reaction of toluene methylation was investigated on a continuous flow micro-apparatus under atmospheric pressure. It was found that the dispersion of MgO was related to the precursor of MgO and had an important effect on the behavior of MgO/HZSM-5 catalyst. MgO disperses both on the internal surface and on the external surface of HZSM-5 in the catalysts prepared with Mg (NO3)(2) as the precursor of MgO, therefore the para-selectivity of the catalyst is higher and the activity is lower. However MgO mainly deposits on the external surface of HZSM-5 in the catalysts prepared with Mg (CH3COO)(2), and the activity of catalysts is higher and the para-selectivity is lower. By secondary impregnation and hydrothermal. treatment MgO/HZSM-5 catalyst with relatively high activity and high para-selectivity was obtained.; 国家重点基础研究发展计划(973计划); 国家自然科学基金; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000172252600002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); 中文核心期刊要目总览(PKU); 中国科学引文数据库(CSCD); 12; 11; 966-971; 17
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/83958]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	王珏,赵璧英,谢有畅. MgO/HZSM-5中MgO分散状态和催化性能的关系, Correlations betwween the Disspersion State OD Mgo and Caralytic Behavior of Mgo/HZSM-5[J]. 物理化学学报,2001.
APA	王珏,赵璧英,&谢有畅.(2001).MgO/HZSM-5中MgO分散状态和催化性能的关系.物理化学学报.
MLA	王珏,et al."MgO/HZSM-5中MgO分散状态和催化性能的关系".物理化学学报 (2001).