Carbon-free H2 production from ammonia triggered at room temperature with an acidic RuO2 /γ-Al2 O3 catalyst

Science Advances
Katsutoshi NagaokaKatsutoshi Sato

Abstract

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.

References

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Citations

Jan 19, 2019·Proceedings of the National Academy of Sciences of the United States of America·Faezeh HabibzadehMilton R Smith
Mar 26, 2019·The Journal of Organic Chemistry·Charitha GurugeNasri Nesnas
Dec 18, 2019·Analytical Chemistry·Wenyu BaiGerald J Diebold
Jun 24, 2020·The Journal of Physical Chemistry. a·Lijun GengZhixun Luo
May 28, 2020·Chemical Reviews·Geletu QingThomas W Hamann

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Methods Mentioned

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