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Extra resources for Absolute Intensities in the Hydrogen-Chloride Rotation Spectrum
Physical adsorption is frequently studied at temperatures not far from, or equal to, the boiling point of the corresponding liquid. The most commonly encountered example encountered in work related to catalysis is the physical adsorption of molecular nitrogen on a high surface-area solid at the temperature of liquid nitrogen (78 K), its boiling point in an open vessel at atmospheric pressure. However, other molecules have also been used in specific cases, examples being the use of the adsorption of Kr or Xe at 78 K to determine low surface areas.
Faraday Trans. I, 68 (1972) 221. Surfaces and Adsorption 29 hydrogen is desorbed, whereas, with Pd, little or no hydrogen is found. At even higher temperatures, in the presence of excess H2S, “sulfidation” of both metals occurs so that the equivalent of multiple layers (“multilayers”) of sulfide forms. (Equivalent results are found for the chemisorption of oxygen: bulk oxidation is found to occur if the temperature is above room temperature). 23) However, with Pd, another complication occurs: some of the hydrogen (in the form of atoms) is “absorbed” in the interstices of the metal to form a hydride rather than desorbing to the gas phase.
The equilibrium position for this chemisorbed state is at a distance equal to the sum of the atomic radii of the hydrogen atom and the metal, rMe þ rH. 6 nm, but the values for the other transition metals will be similar). It can be seen that the chemisorption curve intersects the physical adsorption curve at a value below or very close to the zero of the energy axis. For the transition metals, the intersection generally occurs as here below the zero of potential energy and so the chemisorption process is not activated.