Abstract: Earlier, iron complexes in ZSM-​5 matrix have been shown to generate from nitrous oxide active oxygen species (alfa-​oxygen) responsible for the zeolite activity in selective oxidation of hydrocarbons. In the present work, IR-​spectroscopy, adsorption and isotope methods have been used to investigate the mechanism of alfa-​oxygen interaction with methane, benzene and hydrogen at room temperature on the FeZSM-​5 surface. Methane interaction is accompanied by its dissociation yielding methoxy (2823, 2920, 2945 and 2964 cm-​1) and hydroxy (3635 and 3673 cm-​1) groups bonded to alfa-​oxygen. The high value of the kinetic isotope effect (kH​/kD=3.2) indicates that the C-​H bond cleavage is the rate limiting step. Hydrogen interaction also results in the dissociation producing two OH groups per each mol. Contrary to that, benzene interacts with alfa-​oxygen most likely via the formation of an epoxy-​type intermediate without the C-​H bond breaking at a rate limiting step.

Cite: Dubkov K.A. , Paukshtis E.A. , Panov G.I.
IR Study on the Mechanism of Room Temperature Methane and Benzene Interaction with alfa-Oxygen over Fe-ZSM-5 zeolites
Abstracts of Papers of the American Chemical Society. 2000. V.220. Npart 1. COLL-282 :1-1. WOS РИНЦ AN

Dates:

Published print:

Aug 1, 2000

Identifiers:

Web of science:	WOS:000166091201416
Elibrary:	46663712
Chemical Abstracts:	2000:794474

Citing: Пока нет цитирований