The relationship between the local structure of copper(I) ions on Cu+/zeolite catalysts and their photocatalytic reactivities for the decomposition of NOx into N2 and O2 at 275 K
✍ Scribed by M. Anpo; M. Matsuoka; K. Hanou; H. Mishima; H. Yamashita; H.H. Patterson
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 816 KB
- Volume
- 171
- Category
- Article
- ISSN
- 0010-8545
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✦ Synopsis
Abslrac~
Cu':'zeotite catalysts were prepared b, a combmalion of ionvacuum treatmems. In situ characterizaticm ~, these catalys~s and their photocataiytic reactiviti::s for the decomposition of NQ: {NO a~]d N:,O} have been i~westigated by meat~s of in situ photoluminescence, XAFS, ESR, UV, and FT-1R tec!miq~cs along witt~ at~ analysis of the reaction prod~cts. It was t\vtmd that Cu(:) ions included within the nar~opores of ZSM-5 and mordemte zeolites exist as isolated Cu, ~t) monomers with planar three-coordinate or ~wo-coordinate geo~recry, ~hile m the Y-~.zeol... cavitie;-; they exist as rche [~Tu{ I l-Cu{ I )] dimer species as welt a,.; the isolated (.".~(I1 tno:~ ' ,r species~ UV irradiation of these Cu ~/zeolite catalysts m tl~e presence of NO,. ~ed ~o f~ ,~ocata!ytic decompc,:dtior~ of NO~ into N2 and O: at temperatures as low as 275 K. A f,, ..... lmrge separati,,m i~volvh~g a~. electron transfer from the dec~.ronically excited state of a Ct I ) i,)t~ i 3d'qs \* state} to the a~ti.-n-bonding orbital of an NO molecule was b:nmd to play a vital role in initiating the phetocatMytic decomposition \* Correspor, ding author.