Adsorption of hydrogen on porous materials of activated carbon and zeolite NaX crossover critical temperature

IMR OpenIR

	Adsorption of hydrogen on porous materials of activated carbon and zeolite NaX crossover critical temperature
	J. Li; E. D. Wu
	2009
发表期刊	Journal of Supercritical Fluids
ISSN	0896-8446
卷号	49 期号:2 页码:196-202
摘要	Hydrogen adsorption properties of typical porous materials, activated carbon and zeolite NaX, are studied through isotherm measurements at pressure up to 7 MPa crossover the critical temperature. The Soave-Redlich-Kwong equation of state is selected for calculation of compressibility factor of hydrogen. The two adsorbents exhibit remarkably different hydrogen uptake capacities. which are attributed to their framework structures and porous surfaces. At near critical temperatures, significant drops and recoveries of excess adsorption are observed on the isotherms. The multilayer adsorption and associated reduced density and increased volume of the adsorbed phase are derived from the extents of adsorption drops. The recovery is attributed to the bias of compressibility factor from the assumed equation of state. The negative adsorption is observed at subcritical temperature, and explained by the conception of pore critical temperature and relevant calculation. The isosteric heats of adsorption are determined as 2.1 kJ/mol for activated carbon and 4.4 kJ/mol for NaX, respectively.
部门归属	[li, jing; wu, erdong] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;wu, ed (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china;ewu@imr.ac.cn
关键词	Hydrogen Adsorption Isotherm Activated Carbon Zeolite Nax Critical Temperature Compressibility Factor High-pressure Adsorption Supercritical Hydrogen Neutron-diffraction Confined Phases Critical-point Storage Physisorption Isotherms Capacity Behavior
URL	查看原文
WOS记录号	WOS:000266896100010
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/32021
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. Li,E. D. Wu. Adsorption of hydrogen on porous materials of activated carbon and zeolite NaX crossover critical temperature[J]. Journal of Supercritical Fluids,2009,49(2):196-202.
APA	J. Li,&E. D. Wu.(2009).Adsorption of hydrogen on porous materials of activated carbon and zeolite NaX crossover critical temperature.Journal of Supercritical Fluids,49(2),196-202.
MLA	J. Li,et al."Adsorption of hydrogen on porous materials of activated carbon and zeolite NaX crossover critical temperature".Journal of Supercritical Fluids 49.2(2009):196-202.