This paper deals primarily with the case of vapor-phase burning. Heterogeneous reaction of metal vapor and oxygen (and possibly of volatile oxide species) may take place at the surface of growing oxide smoke particles, in competition with homogeneous gas-phase reaction followed by condensation. The relative importance of the heterogeneous and homogeneous reaction paths is currently the subject of some speculation and controversy. In this connection, a knowledge of the collision efficiency of the heterogeneous reaction was of considerable interest. For the Mg - O2 reaction, an average collision efficiency of 0.075 was previously derived but this value cannot be regarded as very reliable. Results obtained by a recently developed method indicate larger values, probably exceeding 0.3. The mechanism of the reaction of metal vapor and oxygen at the oxide surface is unknown. However, from analogy with chemisorption and catalysis at oxide surfaces, it is found that electron transfer plays an important role, and, under some conditions, may become rate-controlling. Observations of luminescence and of anomalous electron emission during reaction of Mg vapor and oxygen at the oxide surface have provided evidence for electronic excitation in the oxide layer.

Progress in Astronautics and Aeronautics—Volume 15: Heterogeneous Combustion focuses on the processes, reactions, methodologies, and techniques involved in heterogeneous combustion. The selection first offers information on the techniques for the study of combustion of beryllium and aluminum particles, study of quenched aluminum particle combustion, and spectroscopic investigation of metal combustion. Discussions focus on the combustion of metal particles in a hot oxidizing atmosphere, experimental apparatus and procedure, selected examples of residue observations, ignition of beryllium, and photographic study of particle combustion. The text then takes a look at the analytical developments, experimental observations in oxygen atmospheres, and experimental observations in carbon dioxide atmospheres of vapor-phase diffusion flames in the combustion of magnesium and aluminum. The publication ponders on the combustion of elemental boron with fluorine, combustion of pyrolytic boron nitride, characteristics of diborane flames, oxidation of diethyldiborane, and reaction of pentaborane and hydrazine and structure of the adduct. The selection is a dependable reference for readers interested in heterogeneous combustion.

Exposes a Powerful Material-Making Tool Dedicated to the physical, chemical, and structural transformations that take place during combustion synthesis (CS) of advanced materials, Combustion for Material Synthesis analyzes the nature of solid flame phenomenon and provides readers with undisputed proof that ‘fire’ is a powerful tool used in making materials. Of interest to specialists in the field of materials engineering, this book explores the physical and chemical principles of synthesis of materials in the self-sustained combustion mode. It describes mechanisms for a variety of solid–solid and gas–solid reactions and examines structure and properties of different materials produced by CS. The authors discuss a wide range of topics, including phenomenology, theory, experimental methods and observations, as well as properties of the product synthesized and approaches for large-scale materials production using the combustion synthesis technique. They examine conventional concepts and present recent breakthroughs in the field of materials synthesis by rapid self-sustained reactions that include fabrication of different nanomaterials. They compare CS with other methods, factoring in different types of combustion processes, including processes that can occur in a vacuum, inert gas, or oxygen-free atmosphere. Covering research on topics that have been around for a while, but not widely circulated, this work: Outlines in detail both fundamental aspects of CS, including modern theoretical approaches and advanced in situ experimental methods Examines the advantages and disadvantages, achievements, and challenges remained in heterogeneous combustion used for material synthesis Explores the emergence of a new fundamental direction in material science, i.e., structural macrokinetics Details new technologies that are based on fundamental scientific discoveries and innovative scientific ideas Analyzes structure and properties of variety of CS materials, including nanomaterials Authored by world-recognized specialists in the field of combustion synthesis for advanced materials, Combustion for Material Synthesis presents the state of the art in R&D in the field of CS, focusing on the fabrication of novel materials. It is intended for researchers, engineers, and graduate students from different disciplines and is also suggested as recommended reading for materials science courses.

Metal Oxides in Heterogeneous Catalysis is an overview of the past, present and future of heterogeneous catalysis using metal oxides catalysts. The book presents the historical, theoretical, and practical aspects of metal oxide-based heterogeneous catalysis. Metal Oxides in Heterogeneous Catalysis deals with fundamental information on heterogeneous catalysis, including reaction mechanisms and kinetics approaches.There is also a focus on the classification of metal oxides used as catalysts, preparation methods and touches on zeolites, mesoporous materials and Metal-organic frameworks (MOFs) in catalysis. It will touch on acid or base-type reactions, selective (partial) and total oxidation reactions, and enzymatic type reactions The book also touches heavily on the biomass applications of metal oxide catalysts and environmentally related/depollution reactions such as COVs elimination, DeNOx, and DeSOx. Finally, the book also deals with future trends and prospects in metal oxide-based heterogeneous catalysis. Presents case studies in each chapter that provide a focus on the industrial applications Includes fundamentals, key theories and practical applications of metal oxide-based heterogeneous catalysis in one comprehensive resource Edited, and contributed, by leading experts who provide perspectives on synthesis, characterization and applications

This volume is based on the lectures presented at the NATO Advanced Study Institute: (ASI) «Pollutants Formation from Combustion. Formation Mechanisms and Impact on th th Atmospheric Chemistry» held in Maratea, Italy, from 13 to 26 september 1998. Preservation of the environment is of increasing concern in individual countries but also at continental or world scales. The structure of a NATO ASI which involve lecturers and participants of different nationalities was thought as especially well suited to address environmental issues. As combustion is known to substantially contribute to the damaging of the atmosphere, it was natural to concentrate the ASI program on reviewing the currently available knowledge of the formation mechanisms of the main pollutants liberated by combustion systems. In most situations, pollutants are present as trace components and their formation and removal is strongly conditioned by the chemical reactions initiated by fuel consumption. Therefore specific lectures were aimed at defining precisely the general properties of combustion chemistry for gaseous, liquid and solid fuels. Physical factors can strongly affect the combustion chemistry and their influence was also considered. An interesting peculiarity of this specific ASI was to complement the program with a substantial part concerned with the impact of the main combustion pollutants: NOx, aromatics, soot, VOCs, sulphur and chlorinated compounds, on atmospheric chemistry.