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• W2056538067 abstract "Electron spin resonance (ESR) spectroscopy and CO adsorption measurements have shown that Re0 and Re4+ species coexist on the surface of reduced 0.2 wt% ReAl2O3 and 0.3−0.2 wt% PtReAl2O3 catalysts. The catalysts were prepared by incipient wetness impregnation with metallic salt precursors, calcined in air at 500 °C, and dried in He at 500 °C prior to reduction. The Re4+ species, which is stabilized by the Al2O3 and resists reduction up to 500 °C, yields an ESR signal which exhibits hyperfine splitting and accounts for less than 20% of the total Re in ReAl2O3 and less than 10% of the Re in PtReAl2O3. This species does not chemisorb CO but interacts weakly with O2. The Re0 does not give rise to a resonance signal, but adsorbs CO strongly. The double bond shift (DBS) of 1-pentene, hydrogenation of 1-pentene, and the skeletal isomerization (SI) of 3,3-dimethyl-l-butene were tested using mild reaction conditions. The results indicate that Re4+ slightly enhances the Brønsted acidity in ReAl2O3, although this effect is negligible in comparison with the acidity induced by Cl− ions. The Re0 sites are very active for olefin hydrogenation; however, after presulfiding the ReAl2O3, this hydrogenation activity is drastically lowered, but the DBS activity is still high which indicates that surface ReS species are active for the DBS at the Conditions employed." @default.
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• W2056538067 date "1987-07-01" @default.
• W2056538067 modified "2023-10-17" @default.
• W2056538067 title "Characterization and catalytic function of Re0 and Re4+ in Re/Al2O3 and PtRe/Al2O3 catalysts" @default.
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• W2056538067 doi "https://doi.org/10.1016/0021-9517(87)90230-2" @default.
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