Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About
0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | a | b | c | d | e | f | g | h | i | j | k | l | m | n | o | p | q | r | s | t | u | v | w | x | y | z

   |<      <<      >>     > |    


XVII-7.—Phase equilibrium diagram for the system Cu-Mg, in which the two metals are insoluble in each other, forming intermetallie compounds of definite composition.

XVII-8.—Phase equilibrium diagram for the system Cu-Zn, in which a number of phases of variable composition arc formed, mixtures of the phases being stable between the regions of stability of the pure phases. The phase a is face centered cubic, as Cu is, j8 is body centered, 7 is a complicated structure, e and r are hexagonal. The transition between and S is an order-disorder transition, 3 being disordered, and 8 ordered, as discussed in the following chapter.

XVII-9 illustrates the effect of quick LEMs on an unprotected loss of flow transient as obtained in dynamic analysis of the plant. In this particular case, the primary coolant flow rate was supposed to decrease to 10 of the nominal value within 2 seconds.

XVII-l.—-Gibbs free energy of a binary system, as function of concentration.

XVIII-11. Calorimetric differential heat of adsorption of H2 on ZnO. Dashed line

XVIII-13. Activation energies of adsorption and desorption and heat of chemisorption for nitrogen on a single promoted, intensively reduced iron catalyst Q is calculated from Q Edes - ads-

XVIII-14. Schematic illustration of the movement of NO molecules on a Pt. Copyright 1985, American Chemical Society.

XVIII-15. Oxygen atom diffusion on a W surface

XVIII-16. A four-electron two-orbital interaction that a has no net bonding in the free molecule but can be bonding to a metal surface if

XVIII-17. Correlation of catalytic activity toward ethylene dehydrogenation and percent d character of the metallic bond in the metal catalyst.

XVIII-18. Interaction of the a and n molecular orbitals with the Pt d band Ef is the Fermi level.

XVIII-19. Band bending with a negative charge on the surface states

XVIII-2 shows how a surface reaction may be followed by STM, in this case the reaction on a Ni surface

XVIII-20. Spectra of pyridine adsorbed on a water-containing molybdenum oxide -Al203 catalyst

XVIII-21. The framework structure of faujasite.

XVIII-22. Schematic illustration of the steps that may be involved in a surface-mediated reaction

XVIII-23. Potential energy diagram for jN2 jH2 NH3.

XVIII-25. The ethylidyne mechanism for ethylene hydrogenation.

XVIII-26. A well-ordered pillared clay with almost exclusively zeolitelike microporosity.

XVIII-27. Specific rates of CO oxidation on single crystal and supported catalysts as a function of temperature.

XVIII-3—Degree of order as approximated in the two limits of T 0 function of temperature. and T T

XVIII-5.—Gibbs free energy as function of temperature, for different degrees of order, in the order-disorder transition. The envelope of the straight lines represents the free energy of the stable state.

XVIII-7. - Gibbs free energy as function of degree of order,

XVIII-7. Br

XVIII-8. Gibbs free energy as function of composition, for different degreen oi



   |<      <<      >>     > |    

SEARCH



© 2024 chempedia.info