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Rationally tailored redox ability of Sn/γ-Al 2 O 3 with Ag for enhancing the selective catalytic reduction of NO x with propene
Ist Teil von
RSC advances, 2023-01, Vol.13 (3), p.1738-1750
Ort / Verlag
England
Erscheinungsjahr
2023
Link zum Volltext
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
The development of excellent selective catalytic reduction (SCR) catalysts with hydrocarbons for lean-burn diesel engines is of great significance, and a range of novel catalysts loaded with Sn and Ag were studied in this work. It was found that the synergistic effects of Sn and Ag enabled the 1Sn5Ag/γ-Al
O
(1 wt% Sn and 5wt% Ag) to exhibit superior C
H
-SCR performance. The de-NO
efficiency was maintained above 80% between 336 and 448 °C. The characterization results showed that the presence of AgCl crystallites in the 1Sn5Ag/γ-Al
O
catalyst helped its redox ability maintain an appropriate level, which suppressed the over-oxidation of C
H
. Besides, the number of surface adsorbed oxygen (O
) and hydroxyl groups (O
) were enriched, and their reactivity was greatly enhanced due to the coexistence of Ag and Sn. The ratio of Ag
/Ag
was increased to 3.68 due to the electron transfer effects, much higher than that of Ag/γ-Al
O
(2.15). Lewis acid sites dominated the C
H
-SCR reaction over the 1Sn5Ag/γ-Al
O
catalyst. The synergistic effects of Sn and Ag facilitated the formation of intermediates such as acetates, enolic species, and nitrates, and inhibited the deep oxidation of C
H
into CO
, and the C
H
-SCR mechanism was carefully proposed.
Sprache
Englisch
Identifikatoren
ISSN: 2046-2069
eISSN: 2046-2069
DOI: 10.1039/D2RA07316A
Titel-ID: cdi_crossref_primary_10_1039_D2RA07316A
Format
–
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