Performance and Mechanistic Aspects of Ag/MgO/$${\varvec{\gamma}}$$-Al2O3 as a Passive NOx Adsorber

Autor:	Divesh Bhatia, Prateek Khatri
Rok vydání:	2021
Předmět:	010405 organic chemistry Analytical chemistry General Chemistry 010402 general chemistry 01 natural sciences Catalysis Product distribution 0104 chemical sciences chemistry.chemical_compound Adsorption chemistry Particle size NOx adsorber Organometallic chemistry NOx
Zdroj:	Catalysis Letters. 151:3298-3312
ISSN:	1572-879X 1011-372X
DOI:	10.1007/s10562-021-03565-0
Popis:	The potential of Ag/MgO/ $$\gamma $$ -Al2O3 (Ag/Mg–Al) as a passive NOx adsorber is evaluated, and is found to be superior as compared to Ag/ $$\gamma $$ -Al2O3. Two different adsorption sites exist on both Ag/Mg–Al and Ag/ $$\gamma $$ -Al2O3, and it is inferred that the primary role of MgO is not to provide additional adsorption sites but to decrease the Ag particle size, which results in a higher activity towards NOx adsorption. The product distribution profile with either NO or NO2 in the feed is found to be nearly the same at early times, which indicates the formation of the same surface species with either of the reactants. It is deduced that the facile conversion of nitrites to nitrates occurs in the presence of H2, but the extent of conversion decreases at longer times. A sequential configuration of the in-house Ag/Mg–Al and a commercial Cu/SSZ-13 catalyst yielded a NOx reduction efficiency of 85% at low temperatures as against 7% with the standalone Cu/SSZ-13 catalyst.
Databáze:	OpenAIRE
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