RT Journal Article
SR Electronic
T1 Carbon-free H<sub>2</sub> production from ammonia triggered at room temperature with an acidic RuO<sub>2</sub>/γ-Al<sub>2</sub>O<sub>3</sub> catalyst
JF Science Advances
JO Sci Adv
FD American Association for the Advancement of Science
SP e1602747
DO 10.1126/sciadv.1602747
VO 3
IS 4
A1 Nagaoka, Katsutoshi
A1 Eboshi, Takaaki
A1 Takeishi, Yuma
A1 Tasaki, Ryo
A1 Honda, Kyoko
A1 Imamura, Kazuya
A1 Sato, Katsutoshi
YR 2017
UL http://advances.sciencemag.org/content/3/4/e1602747.abstract
AB Ammonia has been suggested as a carbon-free hydrogen source, but a convenient method for producing hydrogen from ammonia with rapid initiation has not been developed. Ideally, this method would require no external energy input. We demonstrate hydrogen production by exposing ammonia and O2 at room temperature to an acidic RuO2/γ-Al2O3 catalyst. Because adsorption of ammonia onto the catalyst is exothermic, the catalyst bed is rapidly heated to the catalytic ammonia autoignition temperature, and subsequent oxidative decomposition of ammonia produces hydrogen. A differential calorimeter combined with a volumetric gas adsorption analyzer revealed a large quantity of heat evolved both with chemisorption of ammonia onto RuO2 and acidic sites on the γ-Al2O3 and with physisorption of multiple ammonia molecules.