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• W1963550315 abstract "Microcalorimetry and 1H NMR have been used to investigate hydrogen chemisorption on Ru/SiO2, K/Ru/S1O2 and Ru-Ag/SiO2. Adding small amounts of K or Ag to Ru/SiO2 significantly reduces the amounts of hydrogen adsorbed and eliminates intermediate (~50 kJ/mole) as well as weakly bound states (<10 kJ/mole) observed at higher pressures on Ru/SiO2. Initial heats of adsorption (~90 kJ/mole) are not affected by the presence of K or Ag on Ru. These observations combined with earlier atomistic simulations with Ru-Ag suggest that defect-like sites play an important role in adsorption and desorption behavior of hydrogen on Ru/SiO2. Similar initial heats of adsorption and invariance of the 1H NMR Knight shift on Ag or K addition imply that there is no electronic effect. Further, the mobility of hydrogen is also reduced in the presence of K promoter. The different theories of alkali promotion in the literature is discussed in the light of the observations made in this work. I t is noted that the weakly bound, atomic hydrogen observed at higher pressures can play an important role in catalysis." @default.
• W1963550315 created "2016-06-24" @default.
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• W1963550315 date "1996-01-01" @default.
• W1963550315 modified "2023-09-23" @default.
• W1963550315 title "Hydrogen chemisorption and mobility on Ru/SiO2, K/Ru/SiO2 and Ru-Ag/SiO2" @default.
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• W1963550315 doi "https://doi.org/10.1016/s0167-2991(96)80303-x" @default.
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