Surface adsorption in strontium chloride ammines

被引:15
|
作者
Ammitzboll, Andreas L. [1 ]
Lysgaard, Steen [2 ,3 ]
Klukowska, Agata [1 ]
Vegge, Tejs [2 ,3 ]
Quaade, Ulrich J. [1 ]
机构
[1] Amminex Emiss Technol AS, DK-2860 Soborg, Denmark
[2] Tech Univ Denmark, Dept Energy Convers & Storage, DK-4000 Roskilde, Denmark
[3] Tech Univ Denmark, Ctr Atom Scale Mat Design, DK-4000 Roskilde, Denmark
来源
JOURNAL OF CHEMICAL PHYSICS | 2013年 / 138卷 / 16期
关键词
CHEMICAL HEAT-PUMPS; SOLID-GAS REACTORS; HYDROGEN STORAGE; AMMONIA; MG(NH3)(6)CL-2;
D O I
10.1063/1.4800754
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
An adsorbed state and its implications on the ab-and desorption kinetics of ammonia in strontium chloride ammine is identified using a combination of ammonia absorption measurements, thermogravimetric analysis, and density functional theory calculations. During thermogravimetric analysis, ammonia desorption originating from the adsorbed state is directly observed below the bulk desorption temperature, as confirmed by density functional theory calculations. The desorption enthalpy of the adsorbed state of strontium chloride octa-ammine is determined with both techniques to be around 37-39 kJ/mol. A simple kinetic model is proposed that accounts for the absorption of ammonia through the adsorbed state. (C) 2013 AIP Publishing LLC.
引用
收藏
页数:6
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