Chung, Dan Bi Kim, Hyo Young Jeon, Mina Lee, Dae Hyung Park, Hyun S. Choi, Sun Hee Nam, Suk Woo Jang, Seong Chul Park, Jung-Han Lee, Kwan-Young Yoon, Chang Won 2024-01-20T02:31:14Z 2024-01-20T02:31:14Z 2021-09-04 2017-01-19 0360-3199 https://pubs.kist.re.kr/handle/201004/123185 Ru (1.0 wt% loaded)-based catalysts supported on La(x)-Al2O3 (x = 0,1, 5,10, and 50 mol%) were synthesized and characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) measurement, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), and temperature programmed reduction (TPR). The as-prepared La(x)-Al2O3 materials were found to have increased amounts of the LaAlO3 phase as the La doping level (x) increased from 0 to 50 mol%. In addition to metal-to support interactions between Ru and Al2O3, the newly formed LaAlO3 phase in the Ru catalysts was proposed to interact strongly with Ru active sites based on the XRD, H-2-TPR and XPS results. The Ru/La(x)-Al2O3 catalysts were active for the dehydrogenation of ammonia, and among them, the Ru/La(10)-Al2O3 and Ru/La(50)-Al2O3 (or Ru/LaAlO3) catalysts exhibited superior performance with >96% conversions of ammonia at 550 degrees C. When an increased Ru content (2.0 wt%) was impregnated onto La(10)-Al2O3, the dehydrogenation activity was significantly improved with nearly 100% conversion (>95%) of ammonia at 500 degrees C. This catalyst further displayed an enhanced thermal stability towards ammonia decomposition with the GHSV(NH3) of 10,000 mL/g(cat)h at 550 degrees C for >120 h. The incorporated element La is thought to play an important role in enhancing metal-support interaction, ultimately facilitating ammonia dehydrogenation even at low temperatures. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD COX-FREE HYDROGEN NH3 DECOMPOSITION THERMAL STABILIZATION CATALYTIC-PROPERTIES PARTICLE-SIZE STORAGE GENERATION TRANSITION CHALLENGES HYDRIDES Enhanced ammonia dehydrogenation over Ru/La(x)-Al2O3 (x=0-50 mol%): Structural and electronic effects of La doping Article 10.1016/j.ijhydene.2016.08.020 1 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.42, no.3, pp.1639 - 1647 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 42 3 1639 1647 scie scopus 000395213800008 2-s2.0-84994461804 Chemistry, Physical Electrochemistry Energy & Fuels Chemistry Electrochemistry Energy & Fuels Article; Proceedings Paper COX-FREE HYDROGEN NH3 DECOMPOSITION THERMAL STABILIZATION CATALYTIC-PROPERTIES PARTICLE-SIZE STORAGE GENERATION TRANSITION CHALLENGES HYDRIDES Ammonia Dehydrogenation Hydrogen storage Ru La doped alumina LaAlO3