Science Advances

Supplementary Materials

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  • Procedures for characterizing the catalysts
  • fig. S1. Conversions and yields for oxidative decomposition of ammonia (Eq. 2) calculated from thermodynamics with HSC Chemistry 6.1.
  • fig. S2. Characterizations of RuO2/γ-Al2O3.
  • fig. S3. Typical experimental procedure for triggering tests using heat produced by adsorption of ammonia on the catalyst.
  • fig. S4. Schematic of the quasi-adiabatic reactor with a quadrupole mass spectrometer (Q-MS) and gas chromatograph (GC).
  • fig. S5. Experimental setup for observing the temperature distribution of the catalyst bed.
  • fig. S6. Trends of MS peak intensities during triggering tests over RuO2/γ-Al2O3 (A) and bare γ-Al2O3 (B).
  • fig. S7. Triggering tests over RuO2/γ-Al2O3 with three GHSVs.
  • fig. S8. Distribution of catalyst bed temperature measured at 300 s during triggering tests over RuO2/γ-Al2O3 with three GHSVs.
  • fig. S9. NH3-TPD profiles of RuO2/γ-Al2O3 (solid lines) and bare γ-Al2O3 (dashed lines).
  • fig. S10. Experimental procedure used for five cycles of testing.
  • table S1. Conversions of ammonia and oxygen and yields of hydrogen during triggering tests over RuO2/γ-Al2O3 at three GHSVs.
  • table S2. Proportions of converted NH3 and O2 and percentage yields of hydrogen during triggering tests over RuO2/γ-Al2O3 with various NH3/O2 molar ratios in the feed gas.
  • table S3. Physicochemical properties of the catalysts.
  • table S4. Molar ratio of Ru/Al in RuO2/γ-Al2O3 before testing (untreated), after five cycles of testing, and after long-term testing (100 hours).
  • Reference (39)

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