Hydrogen uptake in palladium and ruthenium exchanged zeolite X
Hydrogen uptake in palladium and ruthenium exchanged zeolite X
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DOI：
10.1016/j.jallcom.2007.11.058
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发表时间：
2008-10
影响因子：
6.2
通讯作者：
K. Prasanth;Renjith S Pillai;Sunil A Peter;H. Bajaj;R. Jasra;H. Chung;T. H. Kim;S. D. Song
中科院分区：
文献类型：
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作者：
K. Prasanth;Renjith S Pillai;Sunil A Peter;H. Bajaj;R. Jasra;H. Chung;T. H. Kim;S. D. Song
研究了NaX及其钯和钌交换形式在77 K下的静态容量吸附系统（1bar）和在303 K和333 K下的重量吸附系统（5 bar）的吸氢性能和吸氢容量。氢吸附等温线均为Ⅰ型，NaX在77 K时吸附量最大。在77 K的氢吸附容量被发现是减少钯和钌交换水平的增加。在303 K和333 K下观察到氢的化学吸附，并且是由于过渡金属阳离子与氢分子之间的化学相互作用。在303 K和5 bar下观察到钯交换X沸石的最大氢吸收，其值约为85 cm 3/g。用巨正则Monte Carlo模拟方法研究了77 K、303 K和333 K下H2在这些沸石中的吸附。模拟研究适合于建立沸石和吸附质系统的微观行为与实验测量的宏观性质（如吸附等温线）之间的相关性。
The hydrogen adsorption properties and uptake capacities of NaX and its palladium and ruthenium exchanged forms were investigated at 77K in a static volumetric adsorption setup up to 1bar, and at 303K and 333K in a gravimetric adsorption system up to 5bar. All the hydrogen adsorption isotherms were of Type I with a maximum adsorption capacity shown in NaX at 77K temperature. Hydrogen adsorption capacities at 77K were found to be decreasing as palladium and ruthenium exchange levels increases. Chemisorption of hydrogen was observed at 303K and 333K and was due to the chemical interaction between the transition metal cations and the hydrogen molecules. The maximum hydrogen uptake at 303K and 5bar was observed for palladium exchanged zeolite X with a value of around 85cm3/g. Grand canonical Monte Carlo simulations were also performed to study the adsorption of H2in these zeolites at 77K as well as 303K and 333K. 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.