SPECTROSCOPIC STUDIES OF FE(III) ION-EXCHANGED ETS-10 AND ETAS-10 MOLECULAR-SIEVES

被引:9
作者
SOMMERFELD, DA
ELLIS, WR
EYRING, EM
KUZNICKI, SM
THRUSH, KA
机构
[1] UNIV UTAH, DEPT CHEM, SALT LAKE CITY, UT 84112 USA
[2] ENGELHARD CORP, ISELIN, NJ 08830 USA
关键词
D O I
10.1021/j100203a072
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Two new titanium silicate molecular sieves, designated ETS-10 and ETAS-10, have been ion-exchanged with Fe(III). Both products exhibit prominent EPR signals, at g = 6.0 and 4.3, that am assigned to populations of ferric iron on the surface and in the interior cavities, respectively, of the molecular sieve microcrystals. Corollary XPS measurements on these samples indicate that a substantial fraction of the surface iron is present as Fe(II). Chemical modification procedures have been explored in an effort to produce ion-exchanged materials containing no exterior iron. Acid treatment (pH 1.0) proved to be an effective means of achieving this goal in the case of ETS-10-based materials. ETAS-10-based samples do not retain their crystallinity under these conditions.
引用
收藏
页码:9975 / 9978
页数:4
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