Adsorption and Collective Paramagnetism

1st Edition - January 1, 1962
Author: Pierce W. Selwood
Language: English
eBook ISBN:
9 7 8 - 1 - 4 8 3 2 - 7 0 5 1 - 7

Adsorption and Collective Paramagnetism describes a novel method for studying chemisorption. The method is based on the change in the number of unpaired electrons in the adsorbent… Read more

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Adsorption and Collective Paramagnetism describes a novel method for studying chemisorption. The method is based on the change in the number of unpaired electrons in the adsorbent as chemisorption occurs. The method is applicable to almost all adsorbates, but it is restricted to ferromagnetic adsorbents such as nickel, which may be obtained in the form of very small particles, that is to say, to ferromagnetic adsorbents with a high specific surface. While almost all the data used illustratively have been published elsewhere this is the first complete review of the subject. The book is addressed primarily to readers interested in heterogeneous catalysis and related areas of surface chemistry, surface physics, and physical metallurgy. For that reason there are included a number of definitions, and an elementary introduction to magnetism. But it is hoped that specialists in magnetism and solid state physics may also find here something of value. For that reason there is included an introduction to adsorption phenomena. If one group finds the detailed magnetic descriptions and calculations to be tedious it is to be hoped that the adsorption work will be found comprehensible, and vice versa.

PrefaceChapter I Chemistry of Solid-Vapor Interfaces 1. Introduction 2. The Nature of Chemisorption 3. Experimental Methods in Surface Chemistry 4. Introduction to the Magnetic Method ReferencesChapter II Introduction to Magnetism 1. Magnetic Phenomena 2. Atomic Basis of Diamagnetism and Paramagnetism 3. Antiferromagnetism 4. Ferromagnetism 5. Ferrimagnetism ReferencesChapter III Very Small Ferromagnetic Particles 1. Introduction 2. Collective Paramagnetism 3. Anisotropy Effects 4. Some Experimental Evidence for Collective Paramagnetism 5. Particle Size Determination ReferencesChapter IV The Measurement of Saturation Magnetization 1. The Experimental Problem 2. The Method of Weiss and Forrer 3. Correction for Demagnetizing Field 4. Correction for the Magnetic Image Effect 5. Calibration 6. General Procedure ReferencesChapter V Saturation Data 1. Some Experimental Results 2. Discussion of the Experiment 3. The Significance of ε ReferencesChapter VI The Measurement of Magnetization at Low H/T 1. The ac Permeameter 2. The Theory of Low Saturation Measurements 3. Thermal Transients and the Heat of Adsorption ReferencesChapter VII Magnetization-Volume Isotherms for Hydrogen 1. Experimental Data for Hydrogen on Nickel 2. Conclusions Concerning the Bonding of Hydrogen on Nickel 3. The "Slow" Sorption of Hydrogen on Nickel 4. The Effect of Deviations from Collective Paramagnetism 5. Hydrogen on Cobalt ReferencesChapter VIII Hydrogen Sulfide, Cyclohexane, Cyclohexene, and Benzene 1. Theory of the Method for Determining Bond Number 2. Hydrogen Sulfide and Dimethyl Sulfide 3. Cyclohexane 4. Cyclohexene 5. Benzene 6. The Interaction of Benzene and Hydrogen on Nickel ReferencesChapter IX Ethane, Ethylene, and Acetylene 1. Ethane 2. The Associative Adsorption of Ethylene 3. Self-Hydrogenation, Dissociative Adsorption, and Carbiding 4. Remarks on the Hydrogenation of Ethylene 5. Acetylene ReferencesChapter X Carbon Dioxide, Carbon Monoxide, Oxygen, and Nitrogen 1. Carbon Dioxide 2. Carbon Monoxide 3. Oxygen 4. Nitrogen, Argon, and Krypton ReferencesSymbols Used More Than OnceAuthor IndexSubject Index