Hydrogen sorption properties of nanocrystalline Mg2FeH6-based complex and catalytic effect of TiO2

Autor: Jian-min Cui, Huai-fei Liu, Song-lin Li, Sheng-long Tang, Yu-hu Fang, Yi Liu
Rok vydání: 2009
Předmět:
Zdroj: Journal of Central South University of Technology. 16:876-880
ISSN: 1993-0666
1005-9784
DOI: 10.1007/s11771-009-0145-9
Popis: The diversities of hydrogen sorption properties of Mg2FeH6-based complexes with and without TiO2 were investigated. Mg2FeH6-based complexes with and without TiO2 were synthesized respectively by reactive mechanical alloying, and hydrogen sorption properties of the complexes were examined by Sieverts-type apparatus. The results show that the sample without TiO2 releases 4.43 % (mass fraction) hydrogen in 1.5 ks at 653 K under 0.1 MPa H2 pressure and absorbs 90% of the total 4.43 % (mass fraction) hydrogen absorbed in 85 s at 623 K under 4.0 MPa H2 pressure. But for the sample with TiO2 addition under the same condition, it only needs 400 s to release all of the stored hydrogen and 60 s to absorb 90% of the total hydrogen absorbed. The activation energies for desorption process of the samples with and without TiO2 are determined to be 71.2 and 80.3 kJ/(mol·K), respectively. The improvement in hydrogen sorption rate and and reduction in activation energy can be attributed to the addition of TiO2.
Databáze: OpenAIRE
Externí odkaz: