Hydrogen storage using Mg-mixed metal hydrides
Başlık çevirisi mevcut değil.
- Tez No: 402838
- Danışmanlar: DR. HAMID ARASTOOPOUR
- Tez Türü: Yüksek Lisans
- Konular: Kimya Mühendisliği, Chemical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2011
- Dil: İngilizce
- Üniversite: Illinois Institute of Technology
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 71
Özet
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Özet (Çeviri)
Persistent urban air pollution, demand for zero or low emission vehicles and the need to reduce foreign oil imports have been enhanced the need for renewable energy alternatives. Hydrogen is a promising material since it is an environmentally harmless energy carrier. The lack of satisfactory hydrogen storage systems which are safe, cheap and simple is one of the main problems for the transition to a hydrogenbased energy system. Mg-based alloys show potential as hydrogen storage material because of the high gravimetric density of MgH2 (7.6 wt. %), as well as its abundant supply and low cost as a raw material. However, they exhibit high enthalpies of formation, poor hydrogenation/dehydrogenation kinetics, poor charge/discharge cycling stability and high temperature requirements. Also, MgO formation and a high dissociation barrier of clean magnesium surfaces are other major problems with Mg-based alloys. These problems could be solved by mixing Mg with another chemical component, adding a small amount of a catalytically active metal on the surface of the Mg clusters and using smaller particle sizes [11]. The addition of LaNi5 to MgH2 reduced the temperature of hydrogen absorption, accelerated the kinetics at room temperature and yielded higher hydrogen storage capacity at elevated temperatures [3]. Furthermore, literature studies showed that Nb2O5 is the most effective catalyst for the hydrogen sorption reaction of Mg [4]. In this work, MgH2-LaNi5-Nb2O5 composite systems were prepared and studied to obtain a better understanding of hydrogen storage capacity and adsorption/desorption rates. Hydrogen storage capacities of our sorbent were measured by performing adsorption/ desorption experiments at different temperatures. The results of our experimental data were analyzed and compared with available data from the literature. The results of our experiments showed that alloying MgH2 and LaNi5-Nb2O5 increases the hydrogen absorption/desorption capacity and rate at all temperature ranges. The advantages of our novel sorbent are observed more prominently at lower temperatures.
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