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- W285438908 abstract "The possibility of simultaneously introducing ions of Cu(II), Cr(V), and V(IV) into cation positions in ZSM 5 zeolite by reactions in the solid state has been studied. It was shown that following calcination of HZSM 5 and CuCrO/sub 4/ in air a superposition of two EPR spectra was observed that are characteristic of isolated Cu(II) and Cr(V) ions, i.e., isolated ions of the two metals are statistically distributed in the cation positions of the zeolite. Upon successive interaction of the HZSM 5 with CrO/sub 3/ and then with CuO, a significant fraction of the Cr(V) ions originally occupying cation positions are replaced by Cu(II) ions. Upon successive interaction in air between HZSM 5 and V/sub 2/O/sub 5/ and CuO, no less than 90% of the V(IV) ions are replaced by Cu(II) ions in cation positions. Heating this sample at 400/sup 0/C in H/sub 2/ results in the reduction of the Cu(II) ions and their expulsion from cation positions, which remain unoccupied. Raising the temperature to 800/sup 0/C in H/sub 2/ results in the cation positions again being occupied by V(IV) ions." @default.
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- W285438908 date "1987-02-01" @default.
- W285438908 modified "2023-09-23" @default.
- W285438908 title "Introduction of transition-metal ions into cation positions in high-silica zeolites by solid-state reactions. III. The simultaneous introduction of multivalent ions in HZSM 5 seolite" @default.
- W285438908 hasPublicationYear "1987" @default.
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