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Title: Role of adsorbed surface oxygen in the adsorption of NO on alkaline earth oxides and Pt-promoted CaO surfaces

Abstract

An understanding of the interaction between NO and metal-oxide surfaces is of interest for the development of catalysts reducing the nitrogen oxide emissions. Adsorbed surface oxygens are formed on CaO, SrO, and BaO during exposure to N{sub 2}O and their presence is shown to affect the room-temperature NO adsorption. Information about the adsorbed intermediates is contained in the desorption products and in the desorption temperatures during the subsequent heating ramp in Ar. The presence of adsorbed oxygen species increases the total amount of adsorbed NO for CaO and BaO substrates, whereas for SrO the adsorbed intermediate is stabilized. Two NO desorption peaks are found for CaO and SrO, one at low and one at high temperature. The former is assigned to adsorbed NO, whereas the latter is assigned to adsorbed -NO{sub 2} and/or -NO{sub 3} species. NO adsorption as -NO{sub 2} and/or -NO{sub 3} species finds evidence in the corresponding O{sub 2} desorption. Only one NO desorption peak is found for BaO. This NO desorption peak disappears in the absence of preadsorbed surface oxygens. O{sub 2} desorption is observed, even in the absence of any preadsorbed surface oxygens, for CaO and SrO substrates. This suggests NO bond dissociation upon NOmore » adsorption. The effect of the promotion of CaO by Pt has also been investigated. The respective desorption profiles are similar to those for the unpromoted CaO with preadsorbed surface oxygens, although the amounts are significantly increased.« less

Authors:
 [1];  [2]
  1. Chalmers Univ. of Technology and Goeteborg Univ. (Sweden). Dept. of Inorganic Chemistry
  2. Chalmers Univ. of Technology, Goeteborg (Sweden). Competence Centre for Catalysis
Publication Date:
OSTI Identifier:
332702
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical; Journal Volume: 103; Journal Issue: 6; Other Information: PBD: 11 Feb 1999
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; AIR POLLUTION ABATEMENT; NITRIC OXIDE; CALCIUM OXIDES; ADSORPTION; CATALYSTS; WASTE PROCESSING; STRONTIUM OXIDES; BARIUM OXIDES

Citation Formats

Acke, F., and Skoglundh, M.. Role of adsorbed surface oxygen in the adsorption of NO on alkaline earth oxides and Pt-promoted CaO surfaces. United States: N. p., 1999. Web. doi:10.1021/jp9838902.
Acke, F., & Skoglundh, M.. Role of adsorbed surface oxygen in the adsorption of NO on alkaline earth oxides and Pt-promoted CaO surfaces. United States. doi:10.1021/jp9838902.
Acke, F., and Skoglundh, M.. Thu . "Role of adsorbed surface oxygen in the adsorption of NO on alkaline earth oxides and Pt-promoted CaO surfaces". United States. doi:10.1021/jp9838902.
@article{osti_332702,
title = {Role of adsorbed surface oxygen in the adsorption of NO on alkaline earth oxides and Pt-promoted CaO surfaces},
author = {Acke, F. and Skoglundh, M.},
abstractNote = {An understanding of the interaction between NO and metal-oxide surfaces is of interest for the development of catalysts reducing the nitrogen oxide emissions. Adsorbed surface oxygens are formed on CaO, SrO, and BaO during exposure to N{sub 2}O and their presence is shown to affect the room-temperature NO adsorption. Information about the adsorbed intermediates is contained in the desorption products and in the desorption temperatures during the subsequent heating ramp in Ar. The presence of adsorbed oxygen species increases the total amount of adsorbed NO for CaO and BaO substrates, whereas for SrO the adsorbed intermediate is stabilized. Two NO desorption peaks are found for CaO and SrO, one at low and one at high temperature. The former is assigned to adsorbed NO, whereas the latter is assigned to adsorbed -NO{sub 2} and/or -NO{sub 3} species. NO adsorption as -NO{sub 2} and/or -NO{sub 3} species finds evidence in the corresponding O{sub 2} desorption. Only one NO desorption peak is found for BaO. This NO desorption peak disappears in the absence of preadsorbed surface oxygens. O{sub 2} desorption is observed, even in the absence of any preadsorbed surface oxygens, for CaO and SrO substrates. This suggests NO bond dissociation upon NO adsorption. The effect of the promotion of CaO by Pt has also been investigated. The respective desorption profiles are similar to those for the unpromoted CaO with preadsorbed surface oxygens, although the amounts are significantly increased.},
doi = {10.1021/jp9838902},
journal = {Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical},
number = 6,
volume = 103,
place = {United States},
year = {Thu Feb 11 00:00:00 EST 1999},
month = {Thu Feb 11 00:00:00 EST 1999}
}