Enhanced ammonia dehydrogenation over Ru/La(x)-Al2O3 (x = 0–50 mol%): Structural and electronic effects of La doping

Dan Bi Chung, Hyo Young Kim, Mina Jeon, Dae Hyung Lee, Hyun S. Park, Sun Hee Choi, SukWoo Nam, Seong Chul Jang, Jung Han Park, Kwan Young Lee, Chang Won Yoon

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37 Citations (Scopus)


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)-Al2O3materials were found to have increased amounts of the LaAlO3phase 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 LaAlO3phase in the Ru catalysts was proposed to interact strongly with Ru active sites based on the XRD, H2-TPR and XPS results. The Ru/La(x)-Al2O3catalysts were active for the dehydrogenation of ammonia, and among them, the Ru/La(10)-Al2O3and Ru/La(50)-Al2O3(or Ru/LaAlO3) catalysts exhibited superior performance with >96% conversions of ammonia at 550 °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 °C. This catalyst further displayed an enhanced thermal stability towards ammonia decomposition with the GHSVNH3of 10,000 mL/gcat h at 550 °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.

Original languageEnglish
Pages (from-to)1639-1647
Number of pages9
JournalInternational Journal of Hydrogen Energy
Issue number3
Publication statusPublished - 2017 Jan 19

Bibliographical note

Funding Information:
This work was supported by the New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20143030031360). The authors thank Dr. Jeong-Myeong Ha, Adid Adep Dwiatmoko for CO chemisorption analyses. We also thank Jun Kyu Hwang for the data processing related to XPS.

Publisher Copyright:
© 2016 Hydrogen Energy Publications LLC


  • Ammonia
  • Dehydrogenation
  • Hydrogen storage
  • La doped alumina
  • LaAlO
  • Ru

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology


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