In Situ Spectroscopic Studies of NH Oxidation of Fe-Oxide/AlO.

Simple temperature-regulated chemical vapor deposition was used to disperse iron oxide nanoparticles on porous AlO to create an Fe-oxide/AlO structure for catalytic NH oxidation. The Fe-oxide/AlO achieved nearly 100% removal of NH, with N as a major reaction product at temperatures above 400 °C and negligible NO emissions at all experimental temperatures. The results of a combination of in situ diffuse reflectance infrared Fourier-transform spectroscopy and near-ambient pressure-near-edge X-ray absorption fine structure spectroscopy suggest a NH-mediated oxidation mechanism of NH to N via the Mars-van Krevelen pathway on the Fe-oxide/AlO surface. As a catalytic adsorbent-an energy-efficient approach to reducing NH levels in living environments via adsorption and thermal treatment of NH-no harmful NO emissions were produced during the thermal treatment of the NH-adsorbed Fe-oxide/AlO surface, while NH molecularly desorbed from the surface. A system with dual catalytic filters of Fe-oxide/AlO was designed to fully oxidize this desorbed NH to N in a clean and energy-efficient manner.