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Title: Reactions of NO2 with Ba(OH)2 on Pt(111)

Abstract

The interaction of NO2 with amorphous and crystalline Ba(OH)2 supported on Pt(111) was studied in the wide pressure range of 1.0 × 10-9 to 1.0 × 10-4 Torr and compared to that with a thick (> 20 monolayer equivalent (MLE)) BaO film using infrared reflection absorption spectroscopy (IRAS), temperature programmed desorption (TPD), and X-ray photoelectron spectroscopy (XPS). The amorphous and crystalline Ba(OH)2 layers were prepared by exposing a thick BaO (> 20 MLE) layer on Pt(111) to H2O at 300 and 425 K, respectively. The amorphous and crystalline Ba(OH)2 layers partially convert to Ba(NOx)2 (nitrites and nitrates) following their exposure to elevated NO2 pressure (~1.0 × 10-4 Torr) at 300 K. The exposure of the crystalline-Ba(OH)2/Pt(111) system to NO2 at 425 K, however, leads to the desorption of H2O and the complete conversion of the crystalline Ba(OH)2 layer to Ba(NOx)2, which consists of mainly crystalline nitrates and a small amount of nitrites. The amounts of NOx stored by BaO (> 20 MLE)/Pt(111) and crystalline Ba(OH)2/Pt(111) systems upon their exposure to NO2 at 425 K are comparable. The thus-formed bulk crystalline Ba(NO3)2 phase decomposes in two steps, both releasing NO and O2, in accord with the melting/decomposition scheme for bulk Ba(NO3)2.

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1000601
Report Number(s):
PNNL-SA-71210
Journal ID: ISSN 1932-7447; ISSN 1932-7455; 30469; KC0302010; TRN: US201101%%404
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry C, 114(40):16955-16963
Additional Journal Information:
Journal Volume: 114; Journal Issue: 40; Journal ID: ISSN 1932-7447
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION SPECTROSCOPY; DESORPTION; NITRATES; NITRITES; PRESSURE RANGE; REFLECTION; X-RAY PHOTOELECTRON SPECTROSCOPY; Environmental Molecular Sciences Laboratory

Citation Formats

Mudiyanselage, Kumudu, Yi, Cheol-Woo, and Szanyi, Janos. Reactions of NO2 with Ba(OH)2 on Pt(111). United States: N. p., 2010. Web. doi:10.1021/jp101589z.
Mudiyanselage, Kumudu, Yi, Cheol-Woo, & Szanyi, Janos. Reactions of NO2 with Ba(OH)2 on Pt(111). United States. doi:10.1021/jp101589z.
Mudiyanselage, Kumudu, Yi, Cheol-Woo, and Szanyi, Janos. Thu . "Reactions of NO2 with Ba(OH)2 on Pt(111)". United States. doi:10.1021/jp101589z.
@article{osti_1000601,
title = {Reactions of NO2 with Ba(OH)2 on Pt(111)},
author = {Mudiyanselage, Kumudu and Yi, Cheol-Woo and Szanyi, Janos},
abstractNote = {The interaction of NO2 with amorphous and crystalline Ba(OH)2 supported on Pt(111) was studied in the wide pressure range of 1.0 × 10-9 to 1.0 × 10-4 Torr and compared to that with a thick (> 20 monolayer equivalent (MLE)) BaO film using infrared reflection absorption spectroscopy (IRAS), temperature programmed desorption (TPD), and X-ray photoelectron spectroscopy (XPS). The amorphous and crystalline Ba(OH)2 layers were prepared by exposing a thick BaO (> 20 MLE) layer on Pt(111) to H2O at 300 and 425 K, respectively. The amorphous and crystalline Ba(OH)2 layers partially convert to Ba(NOx)2 (nitrites and nitrates) following their exposure to elevated NO2 pressure (~1.0 × 10-4 Torr) at 300 K. The exposure of the crystalline-Ba(OH)2/Pt(111) system to NO2 at 425 K, however, leads to the desorption of H2O and the complete conversion of the crystalline Ba(OH)2 layer to Ba(NOx)2, which consists of mainly crystalline nitrates and a small amount of nitrites. The amounts of NOx stored by BaO (> 20 MLE)/Pt(111) and crystalline Ba(OH)2/Pt(111) systems upon their exposure to NO2 at 425 K are comparable. The thus-formed bulk crystalline Ba(NO3)2 phase decomposes in two steps, both releasing NO and O2, in accord with the melting/decomposition scheme for bulk Ba(NO3)2.},
doi = {10.1021/jp101589z},
journal = {Journal of Physical Chemistry C, 114(40):16955-16963},
issn = {1932-7447},
number = 40,
volume = 114,
place = {United States},
year = {2010},
month = {10}
}