Study of hydrogen surface mobility and hydrogenation reactions over alumina-supported palladium catalysts

Oxidative steam reforming of ethanol over Ir/CeO2 catalysts: A structure sensitivity analysis

“…In Table 4, we have calculated and reported the intrinsic length of the peripheral interface between the Ir particles and the ceria support (IP, expressed in m Ir =m 2 ceria ) for all solids tested, before and after long-term testing. This was calculated by assuming a simple hemispherical model for the metal particles as reported in [46]. This structural parameter, which depends on both Ir dispersion and ceria surface area, varies in a limited range over the series of tested catalysts and will be used later for calculating specific turnover frequency (TOF) values and identifying possible structure sensitivity at the metal/support interface.…”

Light alkane aromatization over modified Zn-ZSM-5 catalysts: characterization of the catalysts by hydrogen/deuterium isotope exchange

“…Homoexchange reactions are denoted ''isotopic equilibration'', when the adsorption-desorption on the metal particle is rate limiting. In this type of exchange, the two hydrogen isotopomers are in equilibrium at the catalyst surface [11,12].…”

Disclosing the synergistic mechanism in the catalytic activity of different-sized Ru nanoparticles for ammonia synthesis at mild reaction conditions

“…The activation of H 2 on supported Ru nanoparticles was studied via the H 2(g) + D 2(g) = 2HD (g) equilibration reaction (or homoexchange) at low temperatures, where the adsorption of H atoms on the metal particle is the rate-determining step [26]. In order to clearly detect the effect of Ru particle size on hydrogen activation, two samples with a more significant difference of Ru particle sizes have been used: Ru1/Al-COLL, containing very small particles, and Ru7/Al-COLL650, where further sintering was induced via calcination at high temperature.…”

“…The activation of H 2 on supported Ru nanoparticles was studied via the H 2(g) + D 2(g) = 2HD (g) equilibration reaction [26]. After evacuating the system under vacuum, 30 mbar of D 2 and H 2 were injected in the reactor and the evolution of the H 2 , D 2 and HD partial pressures was monitored by mass spectrometry.…”

“…Isotopic exchange experiments were performed to study the hydrogen migration from metal particles to the support [26]. In this case, only D 2 (60 mbar) was introduced in the reactor and the H 2 , D 2 and HD partial pressures were monitored while increasing the temperature until H/D exchange occurs.…”