Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2008-09-01

Journal: CATALYSIS LETTERS

Included Journals: Scopus、SCIE、EI

Volume: 125

Issue: 1-2

Page Number: 123-129

ISSN: 1011-372X

Key Words: sodium; FER; nitrosonium ions; nitrate; acetylene; selective catalytic NO reduction

Abstract: Influence of sodium in ferrierite (HFER) zeolite on selective catalytic reduction of NO by acetylene (C(2)H(2)-SCR) was investigated. NO(x) -TPD and FT-IR indicated that small amount of sodium exchanged into the proton-form zeolite with an exchange level of about 11.8% is beneficial for the title reaction by accelerating active nitrate species formation on catalyst surface from NO(2) and by suppressing the reductant combustion. Nevertheless, no further improved catalytic performance in C(2)H(2)-SCR could be observed by a larger amount of sodium exchanged into HFER due to some inactive nitrate species formed on the zeolite. Instead, activity of the zeolite for C(2)H(2)-SCR was drastically reduced, since the capacity of the zeolite for catalyzing NO oxidation and accelerating active NO(+) species formation was remarkably depressed.