In Situ Spectroscopic Studies of NH3Oxidation of Fe-Oxide/Al2O3

Byeong Jun Cha; Ji Yoon Choi; Soo Hyun Kim; Shufang Zhao; Sher Ali Khan; Beomgyun Jeong; Young Dok Kim

doi:10.1021/acsomega.3c01380

In Situ Spectroscopic Studies of NH₃Oxidation of Fe-Oxide/Al₂O₃

Byeong Jun Cha, Ji Yoon Choi, Soo Hyun Kim, Shufang Zhao, Sher Ali Khan, Beomgyun Jeong, Young Dok Kim

Dept. of Fine Chemistry

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Simple temperature-regulated chemical vapor deposition was used to disperse iron oxide nanoparticles on porous Al₂O₃to create an Fe-oxide/Al₂O₃structure for catalytic NH₃oxidation. The Fe-oxide/Al₂O₃achieved nearly 100% removal of NH₃, with N₂as a major reaction product at temperatures above 400 °C and negligible NO_xemissions 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 NH₃to N₂via the Mars-van Krevelen pathway on the Fe-oxide/Al₂O₃surface. As a catalytic adsorbent─an energy-efficient approach to reducing NH₃levels in living environments via adsorption and thermal treatment of NH₃─no harmful NO_xemissions were produced during the thermal treatment of the NH₃-adsorbed Fe-oxide/Al₂O₃surface, while NH₃molecularly desorbed from the surface. A system with dual catalytic filters of Fe-oxide/Al₂O₃was designed to fully oxidize this desorbed NH₃to N₂in a clean and energy-efficient manner.

Original language	English
Pages (from-to)	18064-18073
Number of pages	10
Journal	ACS Omega
Volume	8
Issue number	20
DOIs	https://doi.org/10.1021/acsomega.3c01380
State	Published - 23 May 2023

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10.1021/acsomega.3c01380

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@article{c2b2f21d94ed44d0ae2f1e7f622e2015,

title = "In Situ Spectroscopic Studies of NH3Oxidation of Fe-Oxide/Al2O3",

abstract = "Simple temperature-regulated chemical vapor deposition was used to disperse iron oxide nanoparticles on porous Al2O3to create an Fe-oxide/Al2O3structure for catalytic NH3oxidation. The Fe-oxide/Al2O3achieved nearly 100\% removal of NH3, with N2as a major reaction product at temperatures above 400 °C and negligible NOxemissions 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 NH3to N2via the Mars-van Krevelen pathway on the Fe-oxide/Al2O3surface. As a catalytic adsorbent─an energy-efficient approach to reducing NH3levels in living environments via adsorption and thermal treatment of NH3─no harmful NOxemissions were produced during the thermal treatment of the NH3-adsorbed Fe-oxide/Al2O3surface, while NH3molecularly desorbed from the surface. A system with dual catalytic filters of Fe-oxide/Al2O3was designed to fully oxidize this desorbed NH3to N2in a clean and energy-efficient manner.",

author = "Cha, \{Byeong Jun\} and Choi, \{Ji Yoon\} and Kim, \{Soo Hyun\} and Shufang Zhao and Khan, \{Sher Ali\} and Beomgyun Jeong and Kim, \{Young Dok\}",

year = "2023",

month = may,

day = "23",

doi = "10.1021/acsomega.3c01380",

language = "English",

volume = "8",

pages = "18064--18073",

journal = "ACS Omega",

issn = "2470-1343",

number = "20",

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TY - JOUR

T1 - In Situ Spectroscopic Studies of NH3Oxidation of Fe-Oxide/Al2O3

AU - Cha, Byeong Jun

AU - Choi, Ji Yoon

AU - Kim, Soo Hyun

AU - Zhao, Shufang

AU - Khan, Sher Ali

AU - Jeong, Beomgyun

AU - Kim, Young Dok

PY - 2023/5/23

Y1 - 2023/5/23

N2 - Simple temperature-regulated chemical vapor deposition was used to disperse iron oxide nanoparticles on porous Al2O3to create an Fe-oxide/Al2O3structure for catalytic NH3oxidation. The Fe-oxide/Al2O3achieved nearly 100% removal of NH3, with N2as a major reaction product at temperatures above 400 °C and negligible NOxemissions 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 NH3to N2via the Mars-van Krevelen pathway on the Fe-oxide/Al2O3surface. As a catalytic adsorbent─an energy-efficient approach to reducing NH3levels in living environments via adsorption and thermal treatment of NH3─no harmful NOxemissions were produced during the thermal treatment of the NH3-adsorbed Fe-oxide/Al2O3surface, while NH3molecularly desorbed from the surface. A system with dual catalytic filters of Fe-oxide/Al2O3was designed to fully oxidize this desorbed NH3to N2in a clean and energy-efficient manner.

AB - Simple temperature-regulated chemical vapor deposition was used to disperse iron oxide nanoparticles on porous Al2O3to create an Fe-oxide/Al2O3structure for catalytic NH3oxidation. The Fe-oxide/Al2O3achieved nearly 100% removal of NH3, with N2as a major reaction product at temperatures above 400 °C and negligible NOxemissions 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 NH3to N2via the Mars-van Krevelen pathway on the Fe-oxide/Al2O3surface. As a catalytic adsorbent─an energy-efficient approach to reducing NH3levels in living environments via adsorption and thermal treatment of NH3─no harmful NOxemissions were produced during the thermal treatment of the NH3-adsorbed Fe-oxide/Al2O3surface, while NH3molecularly desorbed from the surface. A system with dual catalytic filters of Fe-oxide/Al2O3was designed to fully oxidize this desorbed NH3to N2in a clean and energy-efficient manner.

UR - https://www.scopus.com/pages/publications/85160949864

U2 - 10.1021/acsomega.3c01380

DO - 10.1021/acsomega.3c01380

M3 - Article

AN - SCOPUS:85160949864

SN - 2470-1343

VL - 8

SP - 18064

EP - 18073

JO - ACS Omega

JF - ACS Omega

IS - 20

ER -

In Situ Spectroscopic Studies of NH₃Oxidation of Fe-Oxide/Al₂O₃

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