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Received November 20, 2013
Accepted March 14, 2014
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Hydrogen storage in proton-conductive perovskite-type oxides and their application
Chemistry Department, Faculty of Science and Arts, Al Qassim University, Buraidah, Saudi Arabia
Korean Journal of Chemical Engineering, October 2014, 31(10), 1792-1797(6), 10.1007/s11814-014-0081-8
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Abstract
Various mixed oxides having perovskite structure were prepared by co-precipitation and sol-gel methods. The samples were calcined at 700 ℃. The produced solids were characterized using X-ray diffraction analysis (XRD), thermogravimetry (TGA), differential thermal analysis (DTA), high resolution transmission electron microscope (HRTEM), nitrogen adsorption at -196 ℃ and hydrogen adsorption isotherms conducted at 100 ℃. The results revealed the formation of nanosized mixed solids, namely LaNiO3, LaFeO3, LaCoO3, LaCu2O4 and LaCrO3 compounds with crystallite size within 27-37 nm. The hysteresis loop of nitrogen adsorption isotherms of different investigated adsorbents indicate clearly the porous nature of different solids calcined at 700 ℃. The most active candidate towards hydrogen uptake is LaNiO3 prepared via sol-gel technique. Its adsorption capacity measured at 100 ℃ and 20 bar hydrogen pressure attained 1.7 wt%. So, LaNiO3 prepared via sol-gel technique could be considered as very promising material for hydrogen storage.
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