Detail Activated carbon fibers and carbon fiber composites for environmental applications Bibliografi Author: Andrews, Rodney Jason ; Grulke, Eric A. (Advisor) Topik: ENGINEERING; CHEMICAL|ENVIRONMENTAL SCIENCES Bahasa: (EN )    ISBN: 0-599-50910-4     Penerbit: University of Kentucky Press     Tahun Terbit: 1999     Jenis: Theses - Dissertation Fulltext: 9948827.pdf (0.0B; 1 download) Abstract Interest in activated carbon fibers (ACF) as adsorbents, catalysts and catalyst supports is growing as increasingly stringent environmental regulations drive the need for new technologies. The rapid adsorption rates and catalytic activity of ACF show promise for meeting the increased performance needs. This work examines the use of ACF and ACF composites (ACFC) in several environmental applications. Formation of ACFC is detailed, with the composite strength related to binder content and degree of thermal processing. The pressure drop in the composites can be modeled using a modified form of the Blake-Kozeny equation: pressure drop per unit length is proportional to the corrected velocity to the 1.220 power, with K, a proportionality equal to 1.62 x 106 for nitrogen and air. A process using ACF to catalytically convert SO2 to H 2SO4 in humidified flue gas is described. Fibers formed into ACFC show no significant activity loss compared to the parent fibers. Over the heat treatment range of 1000–1200°C, the catalytic activity for heat treated fibers goes through a maximum of ∼34 mmol SO2 gcarbon–1 min–1 at ∼1100°C. Kinetic analysis yields a power law model relating the rate of sulfur dioxide conversion as a function of fiber loading, oxygen concentration to the 0.25 power, sulfur dioxide concentration to the 0.123 power and water concentration to the 1.01 power. The apparent rate constant was found to be 24.7. Butane adsorption on ACFC was used as a model for volatile organic recovery and control. The quasi-log normal approximation model was found to give a good fit to experimental data for activated carbon fiber composites (ACFC) adsorber beds. From the model, values for axial dispersion, DL = 0.0005 m2 s–1, and the lumped mass transfer coefficient, klumped = 1.5 m s–1, were determined for the ACFC bed. Finally, the use of carbon fiber composite as a support for a zero-valent metal dehalogenation system is described. The electrically conductive composite allows for metal deposition by electroplating, and increases the metal surface area, and the reaction rate, by an order of magnitude over powdered metal. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Lihat Sejarah Pengadaan  Konversi Metadata   Kembali

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