Hydrogen uptake by carbon nanofibers catalyzed by palladium

• Published in: International journal of hydrogen energy Vol. 29; no. 1; pp. 97 - 102
• Main Authors: Lupu, Dan, Radu Biriş, Alexandru, Mişan, Ioan, Jianu, Adrian, Holzhüter, Gerd, Burkel, Eberhard
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 2004; Elsevier
• Subjects: Alternative fuels. Production and utilization; Applied sciences; Carbon nanofibers; Energy; Exact sciences and technology; Fuels; Hydrogen; Hydrogen uptake; Hydrogen uptake; Carbon nanofibers; Hydrogen storage; Ethylene; Adsorption capacity; Palladium; Chemical vapor deposition; Nanostructured materials; Supported catalyst; Carbon fiber
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/S0360-3199(03)00055-7

Carbon nanofibers of herringbone conformation were obtained by chemical vapor deposition on Pd/La 2O 3 catalyst, from ethylene—hydrogen mixture. After the removal of La 2O 3, samples with various Pd/C ratios were obtained by oxidation in air. The hydrogen sorption capacities measured gravimetrically at 10 MPa in pure hydrogen, for six different batches of samples, show a good correlation with the Pd/C ratio reveling a catalytic effect of Pd, which supplies atomic H. A possible charge transfer might lead to the increasing of the H uptake with the increasing Pd/C ratio. A saturation value of 1.5% H (mass) per carbon is reached at rather high Pd/C mole ratio (∼1) for nanofibers with 425– 455 m 2 g −1 BET surface area.