handbook of carbon, graphite, diamond and fullerenes

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Vitreous Carbon 137 relatively low modulus compared to the bulk material. Very high thermal gradients can be tolerated. Adsorption of Hydrocarbons and Other Gases. In the activated form, vitreous-carbon foam could replace activated-carbon granules without the requirement of a container (see Ch. 10, Sec. 4.0). Potential uses are in emission control and recovery. Other Applications. Vitreous-carbon foam is being considered as a filter for diesel particulates and for the filtration of non-carbide-forming molten metals. 6.0 VITREOUS CARBON SPHERES AND PELLETS Vitreous carbon in the form of microspheres or pellets has a number of applications, especially in the field of catalytic supports. 6.1 Processing A typical process for the production of vitreous-carbon spheres is represented schematically in Fig. 6.9. [17] The precursor is a partially polymerized polymer such as furfuryl alcohol, catalyzed with p-toluene sulfonic acid and mixed with acetone to obtain the proper viscosity for atomizationJ 18 ' A pore former is added which can be an organic material with a high boiling point or sub-micron solid particles such as carbon black. Atomization occurs in the thermal reactor shown schematically in Fig. 6.10J 171 The curing time is very brief because of the small size of the particles (-45/L/m). The microspheres are then heat-treated from 530 to 1330°C. If required, they can be partially oxidized to create micro- and transitional-pores. 6.2 Applications Catalytic Support. Vitreous carbon spheres are being considered as catalyst supports for iron and other metals. The material may offer some important advantages over other forms of carbon, such as lower inorganic impurities (which may poison the catalyst) and a more uniform pore structure. The activation mechanism and the properties and characteristics of catalytic materials are reviewed in greater detail in Ch. 10, Sec. 4.0.
138 Carbon, Graphite, Diamond, and Fullerenes Other Applications: Other applications include foams, low density fillers for plastics and high-temperature thermal insulation. Furfuryl Alcohol Acetone N2 N2 Polymerization Mixing I Particle Generation Solidification 3 -4 sec I Heat Treatment 1 Hour I Sieving Spheres Figure 6.9. Processing flow-chart for vitreous carbon spheres.! 17 ! p-Toluene Sujfonic Acid Liquid and Solid Pore Formers
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HANDBOOK OF CARBON, GRAPHITE, DIAMO
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Contents 1 Introduction and General
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xii Contents 5.0 ELECTRICAL PROPERT
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xiv Contents 2.0 THE CVD OF PYROLYT
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xvi Contents 6.0 CERAMIC-MATRIX, CA
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xviii Contents 4.0 NATURAL AND HIGH
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xx Contents 2.0 STRUCTURE OF THE FU
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Preface ix technology, processes, e
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2 Carbon, Graphite, Diamond, and Fu
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10 Carbon, Graphite, Diamond, and F
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Synthetic Carbon and Graphite: Carb
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Page 137 and 138: Vitreous Carbon 1.0 GENERAL CONSIDE
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188 Carbon, Graphite, Diamond, and
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Applications of Carbon Fibers 1.0 C
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10 Natural Graphite, Graphite Powde
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11 Structure and Properties of Diam
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12 Natural and High-Pressure Synthe
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13 CVD Diamond 1.0 INTRODUCTION The
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15 The Fullerene Molecules 1.0 GENE
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Glossary Ablation: The removal of m
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Index Ablation 38 Absorption bands
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Copyright © 1993 by Noyes Publicat
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vi Series HANDBOOK OF CHEMICAL VAPO
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