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In Situ Spectroscopic Studies of NH3 Oxidation of Fe-Oxide/Al2O3.

ABSTRACT: Simple temperature-regulated chemical vapor deposition was used to disperse iron oxide nanoparticles on porous Al2O3 to create an Fe-oxide/Al2O3 structure for catalytic NH3 oxidation. The Fe-oxide/Al2O3 achieved nearly 100% removal of NH3, with N2 as a major reaction product at temperatures above 400 °C and negligible NOx 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 N2H4-mediated oxidation mechanism of NH3 to N2 via the Mars-van Krevelen pathway on the Fe-oxide/Al2O3 surface. As a catalytic adsorbent-an energy-efficient approach to reducing NH3 levels in living environments via adsorption and thermal treatment of NH3-no harmful NOx emissions were produced during the thermal treatment of the NH3-adsorbed Fe-oxide/Al2O3 surface, while NH3 molecularly desorbed from the surface. A system with dual catalytic filters of Fe-oxide/Al2O3 was designed to fully oxidize this desorbed NH3 to N2 in a clean and energy-efficient manner.

SUBMITTER: Cha BJ 

PROVIDER: S-EPMC10210185 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature

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In Situ Spectroscopic Studies of NH<sub>3</sub> Oxidation of Fe-Oxide/Al<sub>2</sub>O<sub>3</sub>.

Cha Byeong Jun BJ   Choi Ji Yoon JY   Kim Soo Hyun SH   Zhao Shufang S   Khan Sher Ali SA   Jeong Beomgyun B   Kim Young Dok YD  

ACS omega 20230511 20

Simple temperature-regulated chemical vapor deposition was used to disperse iron oxide nanoparticles on porous Al<sub>2</sub>O<sub>3</sub> to create an Fe-oxide/Al<sub>2</sub>O<sub>3</sub> structure for catalytic NH<sub>3</sub> oxidation. The Fe-oxide/Al<sub>2</sub>O<sub>3</sub> achieved nearly 100% removal of NH<sub>3</sub>, with N<sub>2</sub> as a major reaction product at temperatures above 400 °C and negligible NO<sub><i>x</i></sub> emissions at all experimental temperatures. The results of  ...[more]

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