Advances in Catalysis, Vol. 10 by D.D. Eley, W.G. Frankenburg, V.I. Komarewsky, Paul B. Weisz PDF

By D.D. Eley, W.G. Frankenburg, V.I. Komarewsky, Paul B. Weisz (Eds.)

ISBN-10: 0120078104

ISBN-13: 9780120078103

(from preface)The ebook of this quantity occurs within the shadow of the unexpected and unforeseen loss, to the Advances in Catalysis, of 2 of its in demand founders, and, to the area, of 2 cherished individuals of the group of scientists, Dr. W. G. Frankenburg and Dr. V. I. Komarewsky. it sort of feels applicable to show again to the Preface of quantity I of the Advances, and to check the perspectives and hopes which the editors expressed one decade in the past about the prestige of the catalytic technological know-how and the function which they visualized for the then new-born publication.In viewing the scope of information touching on catalytic phenomena they famous the dominance of empirical procedure in catalysis, and expressed the view that ''a technology of catalysis needs to be erected on foundations which nonetheless need to be laid.'' They visualized the Advances as serving as a hyperlink and element of focus of a few of the main major advancements in wisdom of catalysis which then was once ''scattered all through numerous journals and handbooks, overlaying the variety from theoretical physics to descriptions of commercial plants.''

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These failures to observe an absorption band due to metal-hydrogen stretching suggest that hydrogen is not covalently bonded to a single H metal atom in a structure of the type, 1 . Such a bond would be ex- M pected to produce a band in the 3-5-p region. It is reasonable to expect that the bands due to hydrogen which is bonded to two or more metal atoms would be of lower frequency and lesser intensity that the simple covalent M-H band. The “negative” infrared evidence suggests that chernisorption of hydrogen on metals involves multicenter bonds.

The multicenter bond concept implies, however, that the hydrogen loses electrons and has a predominantly protonic character. Observation of a band attributable to chemisorbed hydrogen in the region above 7 p would support the idea of bridging between three or more metal atoms. Unfortunately, carrier-supported samples are not well suited to studies in this region, because of absorption of radiation by the carrier, and improvement in sensitivity is required before weak bands can be detected on carrier-free samples.

365-p band is not restored ( C ) when the temperature is brought up to 20" C. 365-p band was restored by heating t o 200" C. , it is evident that the shift in the OH bands cannot be attributed only to the presence of physically adsorbed gases. 365-r band was observed in samples of porous glass which had been degassed and sealed in a tube for two years. 380-p band of B was not removed by heating to 550" C. This indicates that the results cannot be explained on the basis of inadvertent adsorption of gases evolved from the tube in which the sample was sealed.

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Advances in Catalysis, Vol. 10 by D.D. Eley, W.G. Frankenburg, V.I. Komarewsky, Paul B. Weisz (Eds.)

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