By Abello T.P.

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Once the products are formed, the excess energy is dissipated by further gas-phase collisions. This representation is unrealistic as there will be different heats of adsorption for A and B as well as for C and D; in addition, it is probable that a number of steps will be involved in the surface transition. Further, if there are activation energies for the adsorption for the two reactants, these will be different. The same will be the case for the desorption process. The diagram should be seen only as a means of gaining a picture of how the catalysed reaction occurs.

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 degree to which this can occur depends on the thermodynamics of the PdeH system and to whether or not the hydrogen pressure resulting from the reaction exceeds the equilibrium pressure for the so-called (a þ b) phase.

Theory allows a comparison to be made in a much more quantitative way than had hitherto been possible since it allows one to determine, for any solid, a quantity Vm, the so-called monolayer capacity, and hence its (total) surface area. 12. ) In most cases, the second and subsequent layers begin to form before the first layer is complete. 12: Schematic representation of the formation of first and subsequent layers; note that multilayers start to form before the monolayer is complete. 7 Brunnauer, Emmett and Teller Stephen Brunnauer, a Hungarian born in Budapest in 1903, was first a student and then a postdoc with Paul Emmett (below).

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