Vietnam Journal of Catalysis and Adsorption

RESEARCH PAPER

open access logo 200x200FTIR Study of NO and NO+O2 co-adsorption on Co-ZSM-5 synthesized by different methods

Nguyen Quang Minh1,This email address is being protected from spambots. You need JavaScript enabled to view it., Dao Quoc Tuy1, Ursula Bentrup2

1 School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi 100000, Vietnam
2 Leibniz Institute for Catalysis e. V. at the University of Rostock, 18059 Rostock, Germany

ABSTRACT

Different Co-ZSM-5 catalysts were prepared by solid ion-exchange (SE) and exchange in methanolic solution (LE-MeOH) and characterized by XRD, TPR, and pyridine adsorption. Furthermore, the nature and stability of adsorbed species on the catalyst surface formed under NO and NO+O2 co-adsorption conditions were studied. During NO adsorption the formation of: NO+ occupying cationic zeolite positions [υ(NO) at 2133 cm-1], Co2+(NO)2 dinitrosyls [υs(NO) = 1895 cm-1 and υas(NO) = 1812 cm-1] and Co3+-NO linear species [υ(NO) at 1937 cm-1] was observed. In the presence of gaseous O2 the formation of nitrate and nitrite species is facilitated (1300 to 1650 cm-1), the extent of which depends on the Co content as well as the nature of the Co species formed by the different synthesis methods. The change of intensity bands during the time and temperature were also discussed.

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