期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 466, 期 1-2, 页码 439-446出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2007.11.058
关键词
Hydrogen adsorption; Palladium exchange; Ruthenium exchange; Zeolite X; Grand canonical Monte Carlo simulation
资金
- Korean Government (MOEHRD) [KRF-2006-D00003]
- Korea Research Foundation, South Korea
- CSIR, New Delhi
The hydrogen adsorption properties and uptake capacities of NaX and its palladium and ruthenium exchanged forms were investigated at 77 K in a static volumetric adsorption setup up to 1 bar, and at 303 K and 333 K in a gravimetric adsorption system up to 5 bar. All the hydrogen adsorption isotherms were of Type I with a maximum adsorption capacity shown in NaX at 77 K temperature. Hydrogen adsorption capacities at 77 K were found to be decreasing as palladium and ruthenium exchange levels increases. Chemisorption of hydrogen was observed at 303 K and 333 K and was due to the chemical interaction between the transition metal cations and the hydrogen molecules. The maximum hydrogen uptake at 303 K and 5 bar was observed for palladium exchanged zeolite X with a value of around 85 cm(3)/g. Grand canonical Monte Carlo simulations were also performed to study the adsorption of H, in these zeolites at 77 K as well as 303 K and 333 K. The simulation studies are suitable for establishing a correlation between the microscopic behavior of the zeolite and adsorbate system with the macroscopic properties which are measured experimentally, such as adsorption isotherms. (C) 2007 Elsevier B.V. All rights reserved.
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