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Title: Isotopic labeling studies of the effects of temperature, water, and vanadia loading on the selective catalytic reduction of NO with NH[sub 3] over vanadia-titania catalysts

Abstract

Isotopic labeling studies of the reaction between [sup 15]NO and [sup 14]NH[sub 3] have been performed over a range of vanadia-titania-based SCR catalysts (pure V[sub 2]O[sub 5] and catalysts containing 1.4-23.2 wt% V[sub 2]O[sub 5]) for the extended temperature range of 200-500[degree]C. For temperatures less than 350[degree]C, [sup 14]N[sup 15]N is always the major product. At higher temperatures, however, product distributions are very sensitive to vanadia content; ammonia oxidation to [sup 14]NO is particularly dominant for pure V[sub 2]O[sub 5] and, at 500[degree]C, accounts for more than 70% of the nitrogen-containing products. Pure V[sub 2]O[sub 5] also produces significantly more [sup 14]N[sup 15]NO, and at much lower temperatures, than that observed for a 1.4 wt % V[sub 2]O[sub 5]/TiO[sub 2] catalyst. On the basis of these results it is clear that ammonia oxidation to [sup 14]NO is the major reason for the observed decrease in the NO conversion over vanadia-based catalysts at temperatures greater than 400[degree]C. Ammonia oxidation to nitrogen and nitrous oxide is less significant; [sup 14]N[sub 2]O and [sup 14]N[sub 2] each comprise less than 10% of the total products for both the pure and supported vanadia catalysts. 36 refs., 6 figs., 3 tabs.

Authors:
;  [1];  [2];  [3]
  1. School of Chemical Engineering and Industrial Chemistry, Kensington (Australia)
  2. Macquarie Univ., New South Wales (Australia)
  3. CSIRO Division of Coal and Energy Technology, North Ryde (Australia)
Publication Date:
OSTI Identifier:
6960111
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry; (United States)
Additional Journal Information:
Journal Volume: 98:29; Journal ID: ISSN 0022-3654
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AMMONIA; OXIDATION; NITRIC OXIDE; REDUCTION; CATALYSTS; COMPILED DATA; FLUE GAS; FOSSIL-FUEL POWER PLANTS; LABELLED COMPOUNDS; NITROGEN 14; NITROGEN 15; NITROUS OXIDE; TITANIUM OXIDES; VANADIUM OXIDES; WATER; X-RAY DIFFRACTION; CHALCOGENIDES; CHEMICAL REACTIONS; COHERENT SCATTERING; DATA; DIFFRACTION; GASEOUS WASTES; HYDRIDES; HYDROGEN COMPOUNDS; INFORMATION; ISOTOPES; LIGHT NUCLEI; NITROGEN COMPOUNDS; NITROGEN HYDRIDES; NITROGEN ISOTOPES; NITROGEN OXIDES; NUCLEI; NUMERICAL DATA; ODD-EVEN NUCLEI; ODD-ODD NUCLEI; OXIDES; OXYGEN COMPOUNDS; POWER PLANTS; SCATTERING; STABLE ISOTOPES; THERMAL POWER PLANTS; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; VANADIUM COMPOUNDS; WASTES; 200202* - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions; 400201 - Chemical & Physicochemical Properties

Citation Formats

Duffy, B L, Curry-Hyde, H E, Cant, N W, and Nelson, P F. Isotopic labeling studies of the effects of temperature, water, and vanadia loading on the selective catalytic reduction of NO with NH[sub 3] over vanadia-titania catalysts. United States: N. p., 1994. Web. doi:10.1021/j100080a010.
Duffy, B L, Curry-Hyde, H E, Cant, N W, & Nelson, P F. Isotopic labeling studies of the effects of temperature, water, and vanadia loading on the selective catalytic reduction of NO with NH[sub 3] over vanadia-titania catalysts. United States. https://doi.org/10.1021/j100080a010
Duffy, B L, Curry-Hyde, H E, Cant, N W, and Nelson, P F. 1994. "Isotopic labeling studies of the effects of temperature, water, and vanadia loading on the selective catalytic reduction of NO with NH[sub 3] over vanadia-titania catalysts". United States. https://doi.org/10.1021/j100080a010.
@article{osti_6960111,
title = {Isotopic labeling studies of the effects of temperature, water, and vanadia loading on the selective catalytic reduction of NO with NH[sub 3] over vanadia-titania catalysts},
author = {Duffy, B L and Curry-Hyde, H E and Cant, N W and Nelson, P F},
abstractNote = {Isotopic labeling studies of the reaction between [sup 15]NO and [sup 14]NH[sub 3] have been performed over a range of vanadia-titania-based SCR catalysts (pure V[sub 2]O[sub 5] and catalysts containing 1.4-23.2 wt% V[sub 2]O[sub 5]) for the extended temperature range of 200-500[degree]C. For temperatures less than 350[degree]C, [sup 14]N[sup 15]N is always the major product. At higher temperatures, however, product distributions are very sensitive to vanadia content; ammonia oxidation to [sup 14]NO is particularly dominant for pure V[sub 2]O[sub 5] and, at 500[degree]C, accounts for more than 70% of the nitrogen-containing products. Pure V[sub 2]O[sub 5] also produces significantly more [sup 14]N[sup 15]NO, and at much lower temperatures, than that observed for a 1.4 wt % V[sub 2]O[sub 5]/TiO[sub 2] catalyst. On the basis of these results it is clear that ammonia oxidation to [sup 14]NO is the major reason for the observed decrease in the NO conversion over vanadia-based catalysts at temperatures greater than 400[degree]C. Ammonia oxidation to nitrogen and nitrous oxide is less significant; [sup 14]N[sub 2]O and [sup 14]N[sub 2] each comprise less than 10% of the total products for both the pure and supported vanadia catalysts. 36 refs., 6 figs., 3 tabs.},
doi = {10.1021/j100080a010},
url = {https://www.osti.gov/biblio/6960111}, journal = {Journal of Physical Chemistry; (United States)},
issn = {0022-3654},
number = ,
volume = 98:29,
place = {United States},
year = {Thu Jul 21 00:00:00 EDT 1994},
month = {Thu Jul 21 00:00:00 EDT 1994}
}