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Title: Adsorption and decomposition of NO on lanthanum oxide

Abstract

The adsorption behavior of NO on La{sub 2}O{sub 3}, an effective catalyst for selective NO reduction with CH{sub 4} at temperatures above 800 K, depends upon the pretreatment as indicated by temperature-programmed desorption (TPD) and diffuse reflectance FTIR spectroscopy (DRIFTS). The use of isotopic {sup 18}O{sub 2} exchange and adsorption showed that oxygen adsorbed dissociatively by filling oxygen vacancies and that both oxygen vacancies and lattice oxygen were mobile at high temperature. After La{sub 2}O{sub 3} was pretreated at 973 K in He, exposure to NO at 300 K caused a brief reaction forming N{sub 2}O, then gave three NO TPD peaks at 400, 700, and 800 K. The only O{sub 2} desorption occurred during the 800 K NO peak and gave an NO/O{sub 2} ratio near unity. Oxygen chemisorption prior to NO admission eliminated the formation of N{sub 2}O during NO adsorption at 300 K, blocked the sites giving NO desorption at 700 K, but enhanced the NO and O{sub 2} peaks at 800 K.

Authors:
; ;
Publication Date:
Research Org.:
Pennsylvania State Univ., University Park, PA (US)
OSTI Identifier:
20076092
Resource Type:
Journal Article
Journal Name:
Journal of Catalysis
Additional Journal Information:
Journal Volume: 192; Journal Issue: 1; Other Information: PBD: 15 May 2000; Journal ID: ISSN 0021-9517
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; NITRIC OXIDE; ADSORPTION; DECOMPOSITION; LANTHANUM OXIDES; CATALYTIC EFFECTS; SELECTIVE CATALYTIC REDUCTION; METHANE; FLUE GAS; EXHAUST GASES; AIR POLLUTION CONTROL

Citation Formats

Huang, S.J., Walters, A.B., and Vannice, M.A. Adsorption and decomposition of NO on lanthanum oxide. United States: N. p., 2000. Web. doi:10.1006/jcat.2000.2846.
Huang, S.J., Walters, A.B., & Vannice, M.A. Adsorption and decomposition of NO on lanthanum oxide. United States. doi:10.1006/jcat.2000.2846.
Huang, S.J., Walters, A.B., and Vannice, M.A. Mon . "Adsorption and decomposition of NO on lanthanum oxide". United States. doi:10.1006/jcat.2000.2846.
@article{osti_20076092,
title = {Adsorption and decomposition of NO on lanthanum oxide},
author = {Huang, S.J. and Walters, A.B. and Vannice, M.A.},
abstractNote = {The adsorption behavior of NO on La{sub 2}O{sub 3}, an effective catalyst for selective NO reduction with CH{sub 4} at temperatures above 800 K, depends upon the pretreatment as indicated by temperature-programmed desorption (TPD) and diffuse reflectance FTIR spectroscopy (DRIFTS). The use of isotopic {sup 18}O{sub 2} exchange and adsorption showed that oxygen adsorbed dissociatively by filling oxygen vacancies and that both oxygen vacancies and lattice oxygen were mobile at high temperature. After La{sub 2}O{sub 3} was pretreated at 973 K in He, exposure to NO at 300 K caused a brief reaction forming N{sub 2}O, then gave three NO TPD peaks at 400, 700, and 800 K. The only O{sub 2} desorption occurred during the 800 K NO peak and gave an NO/O{sub 2} ratio near unity. Oxygen chemisorption prior to NO admission eliminated the formation of N{sub 2}O during NO adsorption at 300 K, blocked the sites giving NO desorption at 700 K, but enhanced the NO and O{sub 2} peaks at 800 K.},
doi = {10.1006/jcat.2000.2846},
journal = {Journal of Catalysis},
issn = {0021-9517},
number = 1,
volume = 192,
place = {United States},
year = {2000},
month = {5}
}