An in situ UV-vis and FTIR spectroscopy study of the effect of H2 and CO during the selective catalytic reduction of nitrogen oxides over a silver alumina catalyst
Result description
he effect of hydrogen and carbon monoxide on the selective catalytic reduction of NOx with decane over a 2 wt% Ag/Al2O3 catalyst was investigated. Hydrogen promoted NOx conversion during the SCR reaction, in contrast to carbon monoxide, which had a slightly detrimental effect on catalyst activity, However, in situ UV-vis spectroscopy showed that both carbon monoxide and hydrogen promoted the formation of Ag clusters during the reaction. This, coupled with previous EXAFS experiments and UV-vis data on the rate of change of cluster formation, demonstrate that the enhanced activity from the addition of hydrogen to the NOx-SCR mix cannot be attributed exclusively to the formation of Ag clusters. It is proposed that hydrogen itself participates directly inthe reaction mechanism.
Keywords
The result's identifiers
Result code in IS VaVaI
Alternative codes found
RIV/00216275:25310/05:00003518
Result on the web
—
DOI - Digital Object Identifier
—
Alternative languages
Result language
angličtina
Original language name
An in situ UV-vis and FTIR spectroscopy study of the effect of H2 and CO during the selective catalytic reduction of nitrogen oxides over a silver alumina catalyst
Original language description
he effect of hydrogen and carbon monoxide on the selective catalytic reduction of NOx with decane over a 2 wt% Ag/Al2O3 catalyst was investigated. Hydrogen promoted NOx conversion during the SCR reaction, in contrast to carbon monoxide, which had a slightly detrimental effect on catalyst activity, However, in situ UV-vis spectroscopy showed that both carbon monoxide and hydrogen promoted the formation of Ag clusters during the reaction. This, coupled with previous EXAFS experiments and UV-vis data on the rate of change of cluster formation, demonstrate that the enhanced activity from the addition of hydrogen to the NOx-SCR mix cannot be attributed exclusively to the formation of Ag clusters. It is proposed that hydrogen itself participates directly inthe reaction mechanism.
Czech name
In-situ UV-Vis a FTIR spektroskopická studie efektu H2 a CO na selektivní katalytickou redukci oxidů dusíku na katalyzátoru Ag/alumina
Czech description
Byl studován efekt vodíku a oxidu uhelnatého na selektivní katalytickou redukci oxidů dusíku dekanem na katalyzátoru 2 hm.% Ag/Al2O3. Vodík zvyšuje konverzi během selektivní katalytické redukce, na rozdíl od oxidu uhelnatého, který má mírně nepříznivý efekt na katalytickou aktivitu. Nicméně, in-situ UV-Vis spektra ukázala, že jak vodík tak oxid uhelnatý podporují tvorbu nabitých klastrů. Toto, společně s předcházejícími EXAFS experimenty a UV-Vis daty rychlosti formování klastrů ukazuje, že zvýšení aktivity přidáním vodíku do reakční směsi nemůže být exklusivně připsáno vzniku klastrů stříbra. Vodík samotný participuje v reakčním mechanizmu.
Classification
Type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CF - Physical chemistry and theoretical chemistry
OECD FORD branch
—
Result continuities
Project
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2005
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Catalysis
ISSN
0021-9517
e-ISSN
—
Volume of the periodical
235
Issue of the periodical within the volume
1
Country of publishing house
US - UNITED STATES
Number of pages
6
Pages from-to
195-200
UT code for WoS article
—
EID of the result in the Scopus database
—
Basic information
Result type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP
CF - Physical chemistry and theoretical chemistry
Year of implementation
2005