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Photophysical Properties of Ag(I)-exchanged Zeolite A and the Photoassisted Degradation of Malathion

“…They show high catalytic activity and specific selectivity toward the reactants, intermediates, and products of chemical reactions. [1][2][3][4][5][6][7] Some important applications include catalysts for petroleum refining, petrochemical production, [8][9][10][11][12] gas storage materials, 13 and the use of photochromic and cathodochromic sodalites for information storage, display, and fiber optics. 13 The formation of silver clusters in zeolites has been discussed extensively, [14][15][16][17][18][19][20][21][22][23][24] with one particular case involving zeolite A doped with Ag.…”

“…30 Wasowica et al have indicated that the presence of water significantly affected the silver agglomeration process in the A-type zeolite. 31 In the Ag 6 NaA dehydrated zeolite at 373 K, the Ag 6 n+ cluster is formed after γ irradiation at 77 K. [31][32][33] The same hexameric silver species can also be prepared by hydrogen reduction of AgNaA zeolite at a temperature below 298 K. 34 Moreover, Seifert et al have recently showed that activation at room temperature under low pressure is sufficient to enhance the electronic chargetransfer transition from the oxygen lone pairs of the zeolite framework to the empty 5s orbital of the Ag + ions leading to the yellow form of Ag x + Na + 12-x A. 35,36 Previous studies have demonstrated the presence of ligandunsupported Ag-Ag interactions in mononuclear silver(I) compounds.…”

“…Zeolites are important technological materials because of their many applications. They show high catalytic activity and specific selectivity toward the reactants, intermediates, and products of chemical reactions. − Some important applications include catalysts for petroleum refining, petrochemical production, − gas storage materials, and the use of photochromic and cathodochromic sodalites for information storage, display, and fiber optics…”

10.1007/s10975-008-2017-y

“…Unusual adsorption and catalytic properties of highsilica zeolites modified with doubly charged cations, in particular, Co 2+ ions, have attracted considerable attention in the last few years [1][2][3][4][5][6]. Thus, the adsorption of ç 2 on CoZSM-5 samples was detected [1]; hypothetically, this adsorption occurred at the Co 2+ ions stabilized outside the tetrahedral positions of the zeolite framework.…”

“…Thus, the adsorption of ç 2 on CoZSM-5 samples was detected [1]; hypothetically, this adsorption occurred at the Co 2+ ions stabilized outside the tetrahedral positions of the zeolite framework. The CoZSM-5 catalysts exhibited high activity in the reactions of selective NO x reduction [2], ethane ammoxidation to acetonitrile [3,4], complete hydrocarbon oxidation [5,6], etc. The activity and selectivity of these catalysts was related to not only the state of Co 2+ ions but also the character of their localization in the pore space of high-silica zeolites.…”