By Professor Dr. Vsevolod F. Kiselev, Professor Dr. Oleg V. Krylov (auth.)
This e-book offers with adsorption and catalysis at the floor of transition parts and their compounds, a lot of that are in teresting due to their specific digital constitution. The authors have labored via an enormous physique of experimental evi dence at the constitution and houses of surfaces of transition metals and proper oxides. attention is given more often than not to basic (as against combined) oxides of transition parts, to universal metals and to the adsorption of straightforward gases. loads of consciousness is paid to the character of energetic floor websites liable for chemisorption and catalytic differences. the outline is predicated almost always at the simplified ligand-field idea, which, although, proves rather passable for predicting the adsorptive and catalytic task of species. in lots of circumstances uncomplicated structures have been explored due to novel innovations, and it's only for such platforms that the mechanism of the ele mentary act of adsorption and catalysis could be given sufficient remedy. the current monograph has emerged from our past paintings in Russian, which seemed within the Khimiya Publishing apartment (Mos cow) in 1981. This English variation has, notwithstanding, been revised thoroughly to develop its scope and to incorporate newer a chievements. For fruitful discussions the authors are thankful to A.A.
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Additional resources for Adsorption and Catalysis on Transition Metals and Their Oxides
The intensity of the IR signal is proportional to the squared derivative of the dipole moment with respect to the normal coordinate. It it especially easy to detect vibrations of polar bonds (O-H,N-H,C-O). However, in order to detect even such bonds on the surface, it is necessary to use very high-dispersion powders with a specific surface of 105 -106 cm 2g- 1 . Samples are usually prepared in the form of compact tablets, whose thickness corresponds to 10-40 mg·cm- 2 , or in the form of highdispersion powders deposited onto a transparent support.
The Surfaces of Transition-Metal Oxides The starting point of our discussion of adsorption and catalysis on transition metals will be the surface of transitionmetal oxides. This is because these surfaces are more convenient for studying the principal features of active sites than the transition metals themselves. In the case of oxides, the interaction between the transition-metal atom and oxygen is essentially similar to the interaction between the central atom and the ligands in complexes. 5. Here we shall first consider dilute oxide systems, and then deal with ordinary nondilute systems.
The overall intensity of the EPR spectrum can be related to the concentration of paramagnetic ions. The theory of EPR spectra provides the basis for exact measurements of the degree of oxidation and coordination of transition-metal ions. The electron structure of the paramagnetic center is deduced from the value of the g factor, its anisotropy, fine and hyper fine line structure, and the shape and the width of the line. The g factor allows one to determine the nature of the particle I s paramagnetism: whether the magnetic moment is due soleI y to the spin or is aided by the orbital moment.
Adsorption and Catalysis on Transition Metals and Their Oxides by Professor Dr. Vsevolod F. Kiselev, Professor Dr. Oleg V. Krylov (auth.)