Download or read book Combustion Kinetics of Metal Oxide and Halide Radicals and Metal Atoms written by Arthur Fontijn and published by . This book was released on 1986 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: To help provide a better understanding of the temperature dependence of the kinetics of diatomic metal radical oxidation reactions, experimental measurements were made in the 450 to 1750 K temperature regime. An HTFFR (high-temperature fast-flow reactor) was used. The metal radical concentrations were measured by laser-induced fluorescence. The general uses of this spectrometric technique for rate measurements on reactants and products, as well as for product species identification and product state determination, are reviewed. The radicals studied in the HTFFR on this grant are ALo, AlCl and BCl. Production methods for these are discussed. For the reaction AlO + CO yields AlO2 AlO + AlO2 + CO we obtain k(T) = 2.5 X 10 to the minus 14th power exp (400/T) cc/molecules/s. This negative activation energy implies D(O-AlO)> D(O-CO) = 530 kj/mol, which is in apparent disagreement with the OAlO dissociation energy obtained for AlO2 from Al2O3 evaporation-mass spectrometry studies. It is argued that the latter AlO2 may have a different structure from that of the present work. For the reaction between AlCl and O2 we find k(T) = 6.8 X 10 to the minus 13th power exp( -2990/T) + 1.5 X 10 to the minus 10th power exp( -10600/T) cc/mol/s, which is compatible with a mechanisms where the Al02 + Cl product channel dominates at lower temperatures, while the OAlCl + O channel dominates at higher temperatures. The ln k(T) versus dependence of the AlCl/O2 reaction is contrasted to those observed for AlO/O2 and BF/02 reactions.

Download or read book Combustion Kinetics of Metal Atoms and Metallic Radicals Over Wide Temperature Ranges written by A. Fontijn and published by . This book was released on 1984 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dependence of the rate coefficients of gas-phase oxidation reactions of metallic species on temperature is discussed. Examples given pertain primarily to Al and B species reactions in the 300 - 1900 K range. These reactions show a wide variety of ln k(T) vs. T to the minus 1 power behavior patterns. It is argued that, because of this variety, it is not yet possible to make reliable predictions regarding reactions for which no experimental data on temperature dependence are available. However, some guidance is given toward making preliminary estimates. Quantitative kinetic data on the discussed reactions are given. The experimental method (HTFFR) used to obtain these data is briefly reviewed.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Fundamental Study of the Kinetics of Volatile Metal Oxides and Halides written by Jeffrey A. Ferg and published by . This book was released on 1995 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Reports Awareness Circular TRAC written by and published by . This book was released on 1987 with total page 746 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 966 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1987 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Annual Index Keyword A L written by and published by . This book was released on 1987 with total page 1060 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Symposium on High Temperature Metal Halide Chemistry written by D. L. Hildenbrand and published by . This book was released on 1978 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advanced B and Al Combustion Kinetics Over Wide Temperature Ranges written by Arthur Fontijn and published by . This book was released on 1989 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: To help provide a better understanding of the temperature dependence of the kinetics of gas-phase metal oxidation reactions, experimental measurements were made in the 440 to 1830 K temperature regime. The goals of the work reported have been to provide reliable data on, and improved insight into, the kinetic behavior of Aluminum and Boron atom, monohalide and monoxide radical oxidation reactions, as influenced by temperature. The measurements have been made using the HTFFR (high-temperature fast-flow reactor) technique. HTFFRs are unique tools, which provide measurements on isolated elementary reactions in a heat bath. With traditional high-temperature techniques, such as flames and shock tubes, such isolation is usually impossible to achieve; as a result, data on any given reaction depend on the knowledge of other reactions occurring simultaneously, leading to large uncertainties. In the work reported, laser-induced fluorescence LIF has been used to monitor the metallic atom or radical reactant concentrations, as a function of time, concentration of the molecular oxidant (present in excess), temperature and pressure. (AW).

Download or read book Bimodal Oxidation written by Robert Bakhtchadjian and published by CRC Press. This book was released on 2019-11-15 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to the problems of oxidation chemical reactions and addresses bimodal reaction sequences. Chemical reactions of oxidation, occurring under certain conditions and in multicomponent systems are complex processes. The process of the oxidation essentially changes in the presence and contact of the solid substances with reactants. The role of solid substances and the appearance of this phenomenon in oxidation reaction are discussed. The reader will understand the "driving forces" of this phenomenon and apply it in practice. Written for chemists, physicists, biologists and engineers working in the domain of oxidation reactions. Key Selling Features: Covers the historical background, modern state of the art, and perspectives in investigations of the coupling between heterogeneous and homogeneous reactions Discusses the feasible pathways of the coupling of heterogeneous and homogeneous reactions in oxidation in man-made and natural chemical systems Addresses the abundance, peculiarities and mechanisms of the bimodal reaction sequences in oxidation with dioxygen in recent decades Discusses the existence of the bimodal reaction sequences in chemical systems investigations in atmospheric chemistry and heterogeneous photocatalysis Presented in a simple concise style, accessible for both specialists and non-specialists

Download or read book Kinetics of Metal Atom Oxidation Reactions written by Arthur Fontijn and published by . This book was released on 1972 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: The tubular fast-flow reactor, previously used for reaction kinetic measurements at temperatures up to only 1000K, has been adapted to reach temperatures up to 2000K and has been applied to studies of gas phase reactions of metal atoms with O2. The most extensive set of results obtained so far is for the Fe/O2 reaction in an N2 bath at 1600K. Preliminary results for the Al reaction with O2 at 1700K are discussed. The experimental technique described here allows measurements to be made under reaction conditions overlapping those used in flame and shock-tube studies. A design study for a wall-less reactor which would allow extension of metal atom oxidation studies down to about 200 to 300K is also reported. (Author).

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Download or read book Revise AS Chemistry for AQA written by Paddy Gannon and published by Heinemann. This book was released on 2005-02-16 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Part of our hugely successful series of AS and A2 revision guides