Chemical Reactions on Clean Surfaces, Using Modulated Atomic Beam Techniques PDF Download
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Author: R.L. Palmer
Publisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 42
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Author: R.L. Palmer
Publisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 42
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Author: Howard Saltsburg
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ISBN:
Category :
Languages : en
Pages : 21
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Progress is reported in a study of the H2-D2 exchange reaction which is catalyzed by a clean nickel surface. The preparation of both polycrystalline Ni target foils and vacuum deposited Ni target films is described. The main reaction parameters studied were the reactant beam flux, the beam temperature, and the surface temperature.
Author: J. N Smith (Jr)
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ISBN:
Category :
Languages : en
Pages : 81
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The hydrogen-deuterium exchange reaction on nickel was studied using modulated molecular beam techniques. When coupled with a surface preparation technique that allows one to grow clean single crystals in situ during the experiment, it is shown that the scattering of H2, D2, and HD is specularly directed while the product of the H2/D2 exchange is scattered. The reaction probability implies the importance of the normal component of momentum in controlling the reaction rate. From these data and from earlier studies of the pressure dependence of the reaction the Langmuir type of mechanism is favored over a direct collisional (Rideal) type of mechanism in the exchange reaction H2 + D2 yielding 2HD. Further, it is apparent from the data that the role played by sorbed H2 is important in such reactions on Ni surfaces. (Author).
Author:
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Category : Aeronautics
Languages : en
Pages : 384
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author:
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Category : Government publications
Languages : en
Pages : 1352
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 760
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Author:
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ISBN:
Category : Mass spectrometry
Languages : en
Pages : 900
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Author: Robert L. Palmer
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Category :
Languages : en
Pages : 23
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THERMAL ENERGY MOLECULAR BEAMS HAVE BEEN USED TO STUDY CHEMICAL INTERACTIONS WITH METAL SURFACES. Chemisorption of simple molecules such as H2, O2, CH4, C2Hx and CO was investigated on single and polycrystalline surfaces of Pt, Ni, Co, and Ag. Kinetic parameters and reaction mechanisms were determined for model catalytic reactions including CO and C2Hx oxidation and methanation from H2/CO mixtures. Chemical reactions of NOx with CO and D2 on Pt(111) and other surfaces have been surveyed and the kinetics of NO and O2 chemisorption have been measured. The theory of adsorption/desorption kinetics is reviewed and certain deficiencies identified. (Author).
Author:
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Category :
Languages : en
Pages : 36
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Molecular beams are being used to study chemical interactions on surfaces with increasing frequency and effectiveness. During the period beginning in 1970 through the spring of 1975, the number of published papers in this field approximately doubled. It is the purpose of this article to comprehensively review the field of molecular beam studies of chemical interactions on surfaces during this period and provide a helpful perspective for the use of other workers in this field. Within the scope of this article will be included molecular beam studies of (1) chemisorption with special emphasis on 'activated chemisorption, ' (2) studies of heterogeneous chemical reactions including simple unimolecular decomposition, (3) reactions with the surface of corrosion, and (4) catalytic bimolecular reactions between distinct chemical species on the surface. A discussion of the experimental details of molecular beam techniques and their application to studies of chemical interactions on surfaces has been largely avoided since this topic has been thoroughly discussed in other recent articles.
Author:
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ISBN:
Category : Science
Languages : en
Pages : 204
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