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	乙苯脱氢Fe_2O_3－K_2O系催化剂中晶格氧和钾的助催作用; The Role of Lattice Oxygen and Potassium in Iron-Oxide-Based Catalyst For Dehydrogenation of Ethylbenzene
	夏明 ; 何淡云 ; 祝以湘
	1995
关键词	乙苯 脱氢反应 氧化铁催化剂 晶格氧 钾助催作用。 Ethylbenzene Dehydrogenation Lattice oxygen Iron-oxide catalyst Potassiumpromotion.
英文摘要	采用程序升温还原反应（TPr）、XPS、高温真空Xrd及活性和比表面测定等方法对单组分fE_2O_3、双组分fE_2O_3-k_2O催化剂及工业用XH-03催化剂研究晶格氧的性质和钾的助催作用；结果表明，纯fE_2O_3催化剂表面氧种的还原程度差别较大，反应时晶格氧易于失去，造成缺氧而迅速失活，钾的加入使催化剂生成新的k_2f_E2O_4相，其表面氧种的还原性趋向一定的温度范围，晶格氧数量增加，且其稳定性也增加，从而同时促进了氧转移脱氢和直接脱氢反应的活性，因此认为k_2fE_2O_4可能是活性相，脱氢反应的活性中心应由fE--（2＋）、fE--（3＋）、还原程度一定的晶格氧和k--＋组成。; The role of lattice oxygen and potassium in iron-oxide-based catalysts (Fe_2O_3, Fe_2O)3-K)2O and commercial XH-0 3 ) has been investigated by using TPR(temperature programmed reduction), XPS, high temperature XRD and determination of activity and speciFic surFace area, The high temperature XRD study of the K-promoted iron-oxide catalyst has been shown to have the Formation of new crystalline phase of K_2Fe_2O_4, which promoted the reaction activity. The reduction levels of lattice oxygen are considerably diFFerent at the surFace of Fe_2O_3 catalyst beFore and aFter the reaction.The lattice oxygen was Found to lose easily and resulted in deFiciency of oxygen, which brought about the deactivation of the catalyst on the unpromoted Fe_2O_3 catalyst.At the surFace of K-promoted catalyst, it has an increase in quantity and stability of lattice oxygen and , consequently , increases the activity of the direct heterolytic dehydrogenation and oxygen-transFer dehydrogenation of ethylbenzene.The role of K is to stabilize the interconversion between Fe￣(2+) and Fe￣(3+) and to improve the electron transport between the neighboring active-sites, subseqently promoted the dehydrogenation and the selFregeneration.In this paper, the active phase of the catalyst is suggested to be K_2Fe2O_4 and the active center ofdehydrogenation to be consisted of Fe￣(2+), Fe￣(3+), lattice oxygen at certain reduction level and K￣+.
语种	zh_CN
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/106587]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	夏明,何淡云,祝以湘. 乙苯脱氢Fe_2O_3－K_2O系催化剂中晶格氧和钾的助催作用, The Role of Lattice Oxygen and Potassium in Iron-Oxide-Based Catalyst For Dehydrogenation of Ethylbenzene[J],1995.
APA	夏明,何淡云,&祝以湘.(1995).乙苯脱氢Fe_2O_3－K_2O系催化剂中晶格氧和钾的助催作用..
MLA	夏明,et al."乙苯脱氢Fe_2O_3－K_2O系催化剂中晶格氧和钾的助催作用".(1995).

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