Formation of Cu-MFI NO Decomposition Catalyst via Reductive Solid-State Ion Exchange
High-temperature treatment of a mechanical mixture of CuO and H-MFI zeolite in the absence of O[sub 2] produced a Cu ion-exchanged zeolite catalyst with a high activity for the catalytic decomposition of NO to N[sub 2] and O[sub 2]. Cu is probably introduced as Cu[sup +] cations in zeolite ion-excha...
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Published in | Journal of physical chemistry (1952) Vol. 99; no. 3; pp. 864 - 868 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
United States
American Chemical Society
1995
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Subjects | |
Online Access | Get full text |
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Summary: | High-temperature treatment of a mechanical mixture of CuO and H-MFI zeolite in the absence of O[sub 2] produced a Cu ion-exchanged zeolite catalyst with a high activity for the catalytic decomposition of NO to N[sub 2] and O[sub 2]. Cu is probably introduced as Cu[sup +] cations in zeolite ion-exchange sites via a solid-state ion-exchange process which includes CuO autoreduction to Cu[sup +]. ESR, 1-propanamine thermal desorption, and TPR characterization are consistent with this model. This preparation technique has a theoretical exchange limit of 1 Cu/framework Al, which is double the limit theoretically imposed on Cu[sup 2+] exchange. The preferred preparation conditions give rise to a material which approaches this theoretical limit, and there are probably similarities between catalysts prepared by this method and [open quotes]overexchanged[close quotes] Cu[sup 2+]-MFI materials often reported for NO decomposition. 30 refs., 4 figs. |
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Bibliography: | ark:/67375/TPS-27FHFRZX-J istex:5F86B4DC1FA9F89780311B0E2183549DCB612262 FG05-92ER14291 |
ISSN: | 0022-3654 1541-5740 |
DOI: | 10.1021/j100003a004 |