Removal of NO by reversible adsorption on Fe-Mn based transition metal oxides

Helen Y. Huang; Ralph T. Yang

doi:10.1021/la0102657

Removal of NO by reversible adsorption on Fe-Mn based transition metal oxides

Helen Y. Huang
, Ralph T. Yang

Department of Chemical and Biological Engineering

University at Buffalo

University of Michigan, Ann Arbor

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

116 Scopus citations

Abstract

A series of Fe-Mn-based transition metal oxides were prepared and used for NO adsorption at 25 °C in the presence of O₂. The sorbents were also characterized by BET surface area, TPD, XRD, and FTIR spectroscopy. Both TGA and chemiluminescent NO/NO_x analyzer experiments showed that the mixed oxides were efficient and reversible sorbents for NO removal. The NO_x capacity decreased in the order of Fe-Mn-Ti, Fe-Mn-Zr > Fe-Mn-Ce, Fe-Mn-Ni > Fe-Mn-Co > Fe-Mn-Cu, Fe-Mn. The maximum NO_x capacity reached 42-45 mg/g of sorbent for the Fe-Mn-Ti and Fe-Mn-Zr oxides. SO₂ and CO₂ decreased the NO_x adsorption amount only slightly. H₂O decreased the NO_x adsorption significantly, but the inhibition was reversible. TPD profiles indicated that NO_x species could desorb at temperatures below 400 °C. The high efficiency for NO removal on these oxides was related to their high activities in NO oxidation to NO₂ at 25 °C. FTIR spectra showed that the nitrate was the final species for NO adsorption. NO₂ and nitrite were the intermediates during nitrate formation on the oxides.

Original language	English
Pages (from-to)	4997-5003
Number of pages	7
Journal	Langmuir
Volume	17
Issue number	16
DOIs	https://doi.org/10.1021/la0102657
State	Published - Aug 7 2001

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title = "Removal of NO by reversible adsorption on Fe-Mn based transition metal oxides",

abstract = "A series of Fe-Mn-based transition metal oxides were prepared and used for NO adsorption at 25 °C in the presence of O2. The sorbents were also characterized by BET surface area, TPD, XRD, and FTIR spectroscopy. Both TGA and chemiluminescent NO/NOx analyzer experiments showed that the mixed oxides were efficient and reversible sorbents for NO removal. The NOx capacity decreased in the order of Fe-Mn-Ti, Fe-Mn-Zr > Fe-Mn-Ce, Fe-Mn-Ni > Fe-Mn-Co > Fe-Mn-Cu, Fe-Mn. The maximum NOx capacity reached 42-45 mg/g of sorbent for the Fe-Mn-Ti and Fe-Mn-Zr oxides. SO2 and CO2 decreased the NOx adsorption amount only slightly. H2O decreased the NOx adsorption significantly, but the inhibition was reversible. TPD profiles indicated that NOx species could desorb at temperatures below 400 °C. The high efficiency for NO removal on these oxides was related to their high activities in NO oxidation to NO2 at 25 °C. FTIR spectra showed that the nitrate was the final species for NO adsorption. NO2 and nitrite were the intermediates during nitrate formation on the oxides.",

author = "Huang, \{Helen Y.\} and Yang, \{Ralph T.\}",

year = "2001",

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doi = "10.1021/la0102657",

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TY - JOUR

T1 - Removal of NO by reversible adsorption on Fe-Mn based transition metal oxides

AU - Huang, Helen Y.

AU - Yang, Ralph T.

PY - 2001/8/7

Y1 - 2001/8/7

N2 - A series of Fe-Mn-based transition metal oxides were prepared and used for NO adsorption at 25 °C in the presence of O2. The sorbents were also characterized by BET surface area, TPD, XRD, and FTIR spectroscopy. Both TGA and chemiluminescent NO/NOx analyzer experiments showed that the mixed oxides were efficient and reversible sorbents for NO removal. The NOx capacity decreased in the order of Fe-Mn-Ti, Fe-Mn-Zr > Fe-Mn-Ce, Fe-Mn-Ni > Fe-Mn-Co > Fe-Mn-Cu, Fe-Mn. The maximum NOx capacity reached 42-45 mg/g of sorbent for the Fe-Mn-Ti and Fe-Mn-Zr oxides. SO2 and CO2 decreased the NOx adsorption amount only slightly. H2O decreased the NOx adsorption significantly, but the inhibition was reversible. TPD profiles indicated that NOx species could desorb at temperatures below 400 °C. The high efficiency for NO removal on these oxides was related to their high activities in NO oxidation to NO2 at 25 °C. FTIR spectra showed that the nitrate was the final species for NO adsorption. NO2 and nitrite were the intermediates during nitrate formation on the oxides.

AB - A series of Fe-Mn-based transition metal oxides were prepared and used for NO adsorption at 25 °C in the presence of O2. The sorbents were also characterized by BET surface area, TPD, XRD, and FTIR spectroscopy. Both TGA and chemiluminescent NO/NOx analyzer experiments showed that the mixed oxides were efficient and reversible sorbents for NO removal. The NOx capacity decreased in the order of Fe-Mn-Ti, Fe-Mn-Zr > Fe-Mn-Ce, Fe-Mn-Ni > Fe-Mn-Co > Fe-Mn-Cu, Fe-Mn. The maximum NOx capacity reached 42-45 mg/g of sorbent for the Fe-Mn-Ti and Fe-Mn-Zr oxides. SO2 and CO2 decreased the NOx adsorption amount only slightly. H2O decreased the NOx adsorption significantly, but the inhibition was reversible. TPD profiles indicated that NOx species could desorb at temperatures below 400 °C. The high efficiency for NO removal on these oxides was related to their high activities in NO oxidation to NO2 at 25 °C. FTIR spectra showed that the nitrate was the final species for NO adsorption. NO2 and nitrite were the intermediates during nitrate formation on the oxides.

UR - https://www.scopus.com/pages/publications/0035822850

U2 - 10.1021/la0102657

DO - 10.1021/la0102657

M3 - Article

SN - 0743-7463

VL - 17

SP - 4997

EP - 5003

JO - Langmuir

JF - Langmuir

IS - 16

ER -

Removal of NO by reversible adsorption on Fe-Mn based transition metal oxides

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