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Title: Catalytic decomposition of Ba(NO3)2 on Pt(111)

Abstract

The decomposition of Ba(NO3)2 formed on BaO/Pt(111) (Pt(111) surface is partially covered by BaO) in the presence of CO was studied using temperature programmed desorption (TPD), infrared reflection absorption (IRA) and X-ray photoelectron (XP) spectroscopies. The exposure of BaO/Pt(111) to elevated NO2 pressure (1.0×10-4 Torr) at 450 K leads to the formation of Ba(NO3)2, chemisorbed O (OPt) and Pt-oxide-like domains. During TPD, the Ba(NO3)2 begins to thermally decompose near 490 K, releasing NO and NO2 with the maximum NOx desorption rate seen at 605 K. The OPt species formed following the exposure of BaO/Pt(111) to NO2 react with CO to release CO2 at 450 K. The consumption of OPt during CO oxidation initiates the migration of O from the Pt-oxide-like domains to the chemisorbed phase, where the CO oxidation reaction occurs. Therefore, the removal of OPt by CO leads to the reduction of oxidized Pt, and to the formation of metallic Pt(111) domains, where, subsequently, catalytic decomposition of Ba(NO3)2 can take place. The Pt-catalyzed decomposition of Ba(NO3)2 occurs readily at 450 K, a temperature much lower than the onset of the decomposition temperature of Ba(NO3)2 in the presence of oxidized Pt. This work was supported by the US Department ofmore » Energy Basic Energy Sciences' Chemical Sciences, Geosciences & Biosciences Division. Pacific Northwest National Laboratory is operated by Battelle for the US Department of Energy.« less

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1011792
Report Number(s):
PNNL-SA-76855
Journal ID: ISSN 1932--7447; KC0302010; TRN: US201109%%608
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry C, 115(13):5903-5909
Additional Journal Information:
Journal Volume: 115; Journal Issue: 13; Journal ID: ISSN 1932--7447
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION; DESORPTION; OXIDATION; REFLECTION; REMOVAL; NOX STORAGE MATERIALS; VIBRATIONAL SPECTROSCOPY; ATOMIC OXYGEN; STORED NOX; NITROGEN-DIOXIDE; BARIUM OXIDE; REDUCTION; ADSORPTION; SURFACE; MODEL

Citation Formats

Mudiyanselage, Kumudu, Weaver, Jason F, and Szanyi, Janos. Catalytic decomposition of Ba(NO3)2 on Pt(111). United States: N. p., 2011. Web. doi:10.1021/jp111924z.
Mudiyanselage, Kumudu, Weaver, Jason F, & Szanyi, Janos. Catalytic decomposition of Ba(NO3)2 on Pt(111). United States. doi:10.1021/jp111924z.
Mudiyanselage, Kumudu, Weaver, Jason F, and Szanyi, Janos. Thu . "Catalytic decomposition of Ba(NO3)2 on Pt(111)". United States. doi:10.1021/jp111924z.
@article{osti_1011792,
title = {Catalytic decomposition of Ba(NO3)2 on Pt(111)},
author = {Mudiyanselage, Kumudu and Weaver, Jason F and Szanyi, Janos},
abstractNote = {The decomposition of Ba(NO3)2 formed on BaO/Pt(111) (Pt(111) surface is partially covered by BaO) in the presence of CO was studied using temperature programmed desorption (TPD), infrared reflection absorption (IRA) and X-ray photoelectron (XP) spectroscopies. The exposure of BaO/Pt(111) to elevated NO2 pressure (1.0×10-4 Torr) at 450 K leads to the formation of Ba(NO3)2, chemisorbed O (OPt) and Pt-oxide-like domains. During TPD, the Ba(NO3)2 begins to thermally decompose near 490 K, releasing NO and NO2 with the maximum NOx desorption rate seen at 605 K. The OPt species formed following the exposure of BaO/Pt(111) to NO2 react with CO to release CO2 at 450 K. The consumption of OPt during CO oxidation initiates the migration of O from the Pt-oxide-like domains to the chemisorbed phase, where the CO oxidation reaction occurs. Therefore, the removal of OPt by CO leads to the reduction of oxidized Pt, and to the formation of metallic Pt(111) domains, where, subsequently, catalytic decomposition of Ba(NO3)2 can take place. The Pt-catalyzed decomposition of Ba(NO3)2 occurs readily at 450 K, a temperature much lower than the onset of the decomposition temperature of Ba(NO3)2 in the presence of oxidized Pt. This work was supported by the US Department of Energy Basic Energy Sciences' Chemical Sciences, Geosciences & Biosciences Division. Pacific Northwest National Laboratory is operated by Battelle for the US Department of Energy.},
doi = {10.1021/jp111924z},
journal = {Journal of Physical Chemistry C, 115(13):5903-5909},
issn = {1932--7447},
number = 13,
volume = 115,
place = {United States},
year = {2011},
month = {4}
}