Influence of Cation Substitutions Based on ABO(3) Perovskite Materials, Sr1-XYXTi1-yRuyO3-delta, on Ammonia Dehydrogenation

Title
Influence of Cation Substitutions Based on ABO(3) Perovskite Materials, Sr1-XYXTi1-yRuyO3-delta, on Ammonia Dehydrogenation
Authors
남석우윤성필한종희함형철윤창원박현서도현미차준영김군식김효영송광호
Keywords
암모니아; ammonia; 탈수소화반응; dehydrogenation; 수소저장; hydrogen storage; 에너지 저장; energy storage; 촉매; catalyst
Issue Date
2017-10
Publisher
ACS sustainable chemistry & engineering
Citation
VOL 5, NO 10-9379
Abstract
In order to screen potential catalytic materials for synthesis and decomposition of ammonia, a series of ABO3 perovskite materials, Sr1– xYxTi1– yRuyO3− δ (x = 0, 0.08, and 0.16; y = 0, 0.04, 0.07, 0.12, 0.17, and 0.26) were synthesized and tested for ammonia dehydrogenation. The influence of A or B site substitution on the catalytic ammonia dehydrogenation activity was determined by varying the quantity of either A or B site cation, producing Sr1– xYxTi0.92Ru0.08O3− δ and Sr0.92Y0.08Ti1– δ, respectively. Characterizations of the as-synthesized materials using different analytical techniques indicated that a new perovskite phase of SrRuO3 was produced upon addition of large amounts of Ru (≥12 mol %), and the surface Ru0 species were formed simultaneously to ultimately yield Ruz(surface)/Sr0.92Y0.08Ti1– yRuy– zO3− δ and/or Ruz– w(surface)/SrwRuwO3/Sr0.92– wY0.08Ti1– δ. The newly generated surface Ru0 species at the perovskite surfaces accelerated ammonia dehydrogenation under different conditions, and Sr0.84Y0.16Ti0.92Ru0.08O3− δ exhibited a NH3 conversion of ca. 96% at 500 °C with a gas hourly space velocity (GHSV) of 10  000 mL gcat– 1 h– 1. In addition, Sr0.84Y0.16Ti0.92Ru0.08O3− δ further proved to be highly active and stable toward ammonia decomposition at different reaction temperatures and GHSVs for >275 h.
URI
http://pubs.kist.re.kr/handle/201004/66813
ISSN
2168-0485
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