Untersuchung der Adsorptionszustände des Wasserstoffs an polykristallinen Eisenfilmen mit Hilfe der thermischen Desorption

When carbon monoxide is adsorbed on iron films at temperatures T ≥ 373 K carbon dioxide and carbon are formed. The Boudouard equilibrium is, however, not established at the chosen reaction conditions. In the presence of hydrogen the carbon monoxide adsorption leads to the formation of methane, carbon dioxide, and water. There is no correlation between the formation of water and of methane. The methane formation increases with both the increase in the total pressure and the increase in the partial pressure ratio pH2:pco. The ratio of the partial pressures of CO, H2, CO2, and H2O point to the establishment of the water gas equilibrium at medium temperatures.

Decomposition of carbon monoxide and its reaction with hydrogen on iron films under static conditions at pressures between 2 and 25 mbar and at temperatures between 373 and 573 K

Wedler¹,

Körner²

1981

A Kinetic and Thermodynamic Study of the Reaction of Hydrogen and Deuterium with FeTi at Low Pressures

Pedersen

Møller

Sørensen

1983

The initial reaction of hydrogen and deuterium with clean surfaces of FeTi powder, following a five-cycles activation procedure using hydrogen, were studied by volumetric and microgravimetric techniques. -It was concluded that within the 78 K to 88 K temperature range a non-activated dissociative Temkin chemisorption process occurred upon a Ti surface layer, while at temperatures within the 300 K to 500 K range a dissolution process took place limited by diffusion in the a-phase.The chlorination behaviour of Co and CoPd-alloys with up to 90 weight-% palladium was investigated in the temperature range from 1023 K to 1265 K with HCI-pressures between 0.3 and 0.9 bar. For Co-rich CoPd-alloys a constant rate of weight loss was observed due to the formation of gaseous CoC12 according to the reaction Co(C0Pd) + 2HCl(g) -t CoCl,(g) + H2(g).The results can be well understood by assuming that transport of gaseous CoCI, through the gas boundary layer adjacent to the sample su~face is the rate determining step of chlorination kinetics. These results are in good agreement with theoretical calculations of CoCI2-vapor pressuIes and

Photoelectron Spectroscopic Study of the Adsorption and Co‐adsorption of Hydrogen and Carbon Monoxide on Iron Films

Wedler

Ertel

1983

The adsorption of carbon monoxide and of hydrogen on evaporated iron films is studied by means of ultra violet photoelectron spectroscopy (UPS) and X‐ray photoelectron spectroscopy (XPS). Both methods indicate that carbon monoxide begins to decompose at 298 K. At 423 K the decomposition is complete. UP spectra of co‐adsorbed hydrogen and carbon monoxide confirm the existence of an interaction between these two gases in the adsorption layer at 298 K. The results are used to correlate earlier thermodynamic and kinetic studies with known literature data about photoelectron spectra of the systems Fe/H2, CO and to discuss the influence of crystal orientation and surface structure on the adsorption of H2 and CO on Fe.