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Title: XPS/FTIR study of the interaction between NO and YBa[sub 2]Cu[sub 3]O[sub 7]

Abstract

The combination of X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and simultaneous thermal analysis (STA) studies has shown that the interaction between NO and YBa[sub 2]Cu[sub 3]O[sub 7] occurs at room temperature and above, resulting in the formation of the nitride, nitrate, nitrite (NO[sub 2][sup [minus]]), and nitrito (-ONO) groups, as well as in the release of N[sub 2], NO[sub 2], and N[sub 2]O. The nitride species are observed at temperatures between 300 and 540 K but not at higher temperatures. The nitrate ion is the predominant nitrogen-containing species at temperatures below 540 K, and its concentration decays at elevated temperatures (>820 K). The nitrito group can be found at room temperature as well as elevated temperatures. The nitrite ion is observed with relatively low concentrations at lower temperatures but becomes the predominant nitrogen-containing species at high temperatures. The maximum increase in the sample weight ([approximately]7%) as measured by thermogravimetry (TG) corresponds to a net uptake of a NO[sub 2] group (or an NO molecule plus an O atom) per unit cell of YBa[sub 2]Cu[sub 3]O[sub 7]. The NO interaction also results in the oxidation of a small portion (<24%) of the lattice Cu(II) ions and, to amore » lesser extent, the oxidation of the lattice barium atoms. At 830-920 K the surface segregation of the barium atoms is evident and is thought to be indicative of the matrix degradation due to the formation of barium nitrite. A detailed mechanism of the interaction between YBa[sub 2]Cu[sub 3]O[sub 7] and NO is postulated and applied to explain the high catalytic activity for the selective reduction of NO on YBa[sub 2]Cu[sub 3]O[sub 7].« less

Authors:
; ; ; ;  [1]
  1. National Univ. of Singapore, Kent Ridge Cresent (Singapore)
Publication Date:
OSTI Identifier:
7165073
Resource Type:
Journal Article
Journal Name:
Inorganic Chemistry; (United States)
Additional Journal Information:
Journal Volume: 32:24; Journal ID: ISSN 0020-1669
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BARIUM OXIDES; CHEMICAL REACTIONS; COPPER OXIDES; NITRIC OXIDE; YTTRIUM OXIDES; ABSORPTION SPECTROSCOPY; CATALYTIC EFFECTS; OXIDATION; PHOTOELECTRON SPECTROSCOPY; REDUCTION; THERMAL ANALYSIS; THERMAL GRAVIMETRIC ANALYSIS; X-RAY SPECTROSCOPY; ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CHALCOGENIDES; CHEMICAL ANALYSIS; COPPER COMPOUNDS; ELECTRON SPECTROSCOPY; GRAVIMETRIC ANALYSIS; NITROGEN COMPOUNDS; NITROGEN OXIDES; OXIDES; OXYGEN COMPOUNDS; QUANTITATIVE CHEMICAL ANALYSIS; SPECTROSCOPY; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS; 400201* - Chemical & Physicochemical Properties

Citation Formats

Lin, Jianyi, Wee, A T.S., Tan, Kuang Lee, Neoh, Koon Gee, and Teo, Wah Koon. XPS/FTIR study of the interaction between NO and YBa[sub 2]Cu[sub 3]O[sub 7]. United States: N. p., 1993. Web. doi:10.1021/ic00076a019.
Lin, Jianyi, Wee, A T.S., Tan, Kuang Lee, Neoh, Koon Gee, & Teo, Wah Koon. XPS/FTIR study of the interaction between NO and YBa[sub 2]Cu[sub 3]O[sub 7]. United States. https://doi.org/10.1021/ic00076a019
Lin, Jianyi, Wee, A T.S., Tan, Kuang Lee, Neoh, Koon Gee, and Teo, Wah Koon. 1993. "XPS/FTIR study of the interaction between NO and YBa[sub 2]Cu[sub 3]O[sub 7]". United States. https://doi.org/10.1021/ic00076a019.
@article{osti_7165073,
title = {XPS/FTIR study of the interaction between NO and YBa[sub 2]Cu[sub 3]O[sub 7]},
author = {Lin, Jianyi and Wee, A T.S. and Tan, Kuang Lee and Neoh, Koon Gee and Teo, Wah Koon},
abstractNote = {The combination of X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and simultaneous thermal analysis (STA) studies has shown that the interaction between NO and YBa[sub 2]Cu[sub 3]O[sub 7] occurs at room temperature and above, resulting in the formation of the nitride, nitrate, nitrite (NO[sub 2][sup [minus]]), and nitrito (-ONO) groups, as well as in the release of N[sub 2], NO[sub 2], and N[sub 2]O. The nitride species are observed at temperatures between 300 and 540 K but not at higher temperatures. The nitrate ion is the predominant nitrogen-containing species at temperatures below 540 K, and its concentration decays at elevated temperatures (>820 K). The nitrito group can be found at room temperature as well as elevated temperatures. The nitrite ion is observed with relatively low concentrations at lower temperatures but becomes the predominant nitrogen-containing species at high temperatures. The maximum increase in the sample weight ([approximately]7%) as measured by thermogravimetry (TG) corresponds to a net uptake of a NO[sub 2] group (or an NO molecule plus an O atom) per unit cell of YBa[sub 2]Cu[sub 3]O[sub 7]. The NO interaction also results in the oxidation of a small portion (<24%) of the lattice Cu(II) ions and, to a lesser extent, the oxidation of the lattice barium atoms. At 830-920 K the surface segregation of the barium atoms is evident and is thought to be indicative of the matrix degradation due to the formation of barium nitrite. A detailed mechanism of the interaction between YBa[sub 2]Cu[sub 3]O[sub 7] and NO is postulated and applied to explain the high catalytic activity for the selective reduction of NO on YBa[sub 2]Cu[sub 3]O[sub 7].},
doi = {10.1021/ic00076a019},
url = {https://www.osti.gov/biblio/7165073}, journal = {Inorganic Chemistry; (United States)},
issn = {0020-1669},
number = ,
volume = 32:24,
place = {United States},
year = {Wed Nov 24 00:00:00 EST 1993},
month = {Wed Nov 24 00:00:00 EST 1993}
}