Abstract
Degassing above 573/sup 0/K of Ag-Y or Ag-mordenite previously reduced by hydrogen at 623/sup 0/K resulted in hydrogen evolution, the amount of hydrogen increasing to a maximum at about 873/sup 0/K. No hydrogen was evolved when the zeolite was reduced by hydrazine or hydroxylamine, indicating that hydrogen is formed by reaction between silver metal and hydroxyl groups formed in the reduction step (i.e., the reverse of the reduction step). Consumption of hydroxyl groups was proven by IR studies of pyridine chemisorption which occurs entirely as pyridinium ions on Broensted sites or reduced samples but with increasing formation of pyridine on Lewis acid sites as the degassing temperature increases; formation of silver(I) ions was proven by carbon monoxide complexation. Silver metal outside the zeolite pores was not affected by the degassing, and the amount of hydrogen evolved upon degassing decreased with increasing number of reduction-degassing cycles, probably as a result of dehydroxylation or sintering. Spectra, graphs, tables, and 21 references.
Citation Formats
Jacobs, P A, Uytterhoeven, J B, and Beyer, H K.
Redox behavior of transition metal ions in zeolites 6. Reversibility of the reduction reaction in silver zeolites.
United Kingdom: N. p.,
1977.
Web.
doi:10.1039/f19777301755.
Jacobs, P A, Uytterhoeven, J B, & Beyer, H K.
Redox behavior of transition metal ions in zeolites 6. Reversibility of the reduction reaction in silver zeolites.
United Kingdom.
https://doi.org/10.1039/f19777301755
Jacobs, P A, Uytterhoeven, J B, and Beyer, H K.
1977.
"Redox behavior of transition metal ions in zeolites 6. Reversibility of the reduction reaction in silver zeolites."
United Kingdom.
https://doi.org/10.1039/f19777301755.
@misc{etde_5770157,
title = {Redox behavior of transition metal ions in zeolites 6. Reversibility of the reduction reaction in silver zeolites}
author = {Jacobs, P A, Uytterhoeven, J B, and Beyer, H K}
abstractNote = {Degassing above 573/sup 0/K of Ag-Y or Ag-mordenite previously reduced by hydrogen at 623/sup 0/K resulted in hydrogen evolution, the amount of hydrogen increasing to a maximum at about 873/sup 0/K. No hydrogen was evolved when the zeolite was reduced by hydrazine or hydroxylamine, indicating that hydrogen is formed by reaction between silver metal and hydroxyl groups formed in the reduction step (i.e., the reverse of the reduction step). Consumption of hydroxyl groups was proven by IR studies of pyridine chemisorption which occurs entirely as pyridinium ions on Broensted sites or reduced samples but with increasing formation of pyridine on Lewis acid sites as the degassing temperature increases; formation of silver(I) ions was proven by carbon monoxide complexation. Silver metal outside the zeolite pores was not affected by the degassing, and the amount of hydrogen evolved upon degassing decreased with increasing number of reduction-degassing cycles, probably as a result of dehydroxylation or sintering. Spectra, graphs, tables, and 21 references.}
doi = {10.1039/f19777301755}
journal = []
volume = {73:11}
journal type = {AC}
place = {United Kingdom}
year = {1977}
month = {Jan}
}
title = {Redox behavior of transition metal ions in zeolites 6. Reversibility of the reduction reaction in silver zeolites}
author = {Jacobs, P A, Uytterhoeven, J B, and Beyer, H K}
abstractNote = {Degassing above 573/sup 0/K of Ag-Y or Ag-mordenite previously reduced by hydrogen at 623/sup 0/K resulted in hydrogen evolution, the amount of hydrogen increasing to a maximum at about 873/sup 0/K. No hydrogen was evolved when the zeolite was reduced by hydrazine or hydroxylamine, indicating that hydrogen is formed by reaction between silver metal and hydroxyl groups formed in the reduction step (i.e., the reverse of the reduction step). Consumption of hydroxyl groups was proven by IR studies of pyridine chemisorption which occurs entirely as pyridinium ions on Broensted sites or reduced samples but with increasing formation of pyridine on Lewis acid sites as the degassing temperature increases; formation of silver(I) ions was proven by carbon monoxide complexation. Silver metal outside the zeolite pores was not affected by the degassing, and the amount of hydrogen evolved upon degassing decreased with increasing number of reduction-degassing cycles, probably as a result of dehydroxylation or sintering. Spectra, graphs, tables, and 21 references.}
doi = {10.1039/f19777301755}
journal = []
volume = {73:11}
journal type = {AC}
place = {United Kingdom}
year = {1977}
month = {Jan}
}