Download or read book Materials for High temperature Catalytic Combustion written by and published by . This book was released on 1994 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalytic combustion systems for gas turbines must operate at temperatures of at least 1200°C. Support structure material must retain its integrity under prolonged exposure to high temperature, thermal cycling, and severe chemical conditions; and the material must be capable of being formed into thin sections. The performance requirements of a high-temperature stable ceramic support must be balanced with reasonable costs of preparation. An increasing number of materials have potential for successful exposure to high-temperature conditions. Two major problems of high-temperature catalyst systems are loss of surface area and catalytic activity. Incorporation of the catalytic component into the host lattice can circumvent this problem. Use of supporting active metal oxides on carrier materials with high thermal resistance appears to be a very promising way to make stable catalysts. The challenge will be to provide sufficient low-temperature activity and high-temperature stability; therefore, there exists a need to engineer catalytic materials for high-temperature combustion environments. Developments in catalytic materials and preparation procedures are reviewed. Future areas of research are discussed.
Download or read book Materials for High temperature Catalytic Combustion written by Anders Ersson and published by . This book was released on 2003 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanotemplated High temperature Materials for Catalytic Combustion written by and published by . This book was released on 2008 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Materials for High Temperature Catalytic Combustion Presented at the International Workshop on Catalytic Combustion Tokyo Japan 17 20 Apr 1994 International Workshop on Catalytic Combustion Tokyo 17 20 Apr 1994 written by K. S. Ramesh and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Catalyst Materials for High temperature Processes written by K. S. Ramesh and published by . This book was released on 1997 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the April 1996 symposium. Fifteen contributions present a mix of applied science providing an understanding of physical and chemical phenomena that can lead to improved catalyst performance and technology applications, among them, methane reforming, automotive and diesel exhaust catal
Download or read book Catalytic Materials for High temperature Combustion written by Marco Zwinkels and published by . This book was released on 1991 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Introduction to Catalytic Combustion written by R.E. Hayes and published by Routledge. This book was released on 2021-10-25 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a clear and concise manner, this book explains how to apply concepts in chemical reaction engineering and transport phenomena to the design of catalytic combustion systems. Although there are many textbooks on the subject of chemical reaction engineering, catalytic combustion is mentioned either only briefly or not at all. The authors have chosen three examples where catalytic combustion is utilized as a primary combustion process and natural gas is used as a fuel - stationary gas turbines, process fluid heaters, and radiant heaters; these cover much of the area where research is currently most active. In each of these there are clear environmental benefits to be gained illustrating catalytic combustion as a "cleaner primary combustion process" . The dominant heat transfer processes in each of the applications are different, as are the support systems, flow geometrics and operating conditions.
Download or read book Structured Catalysts and Reactors written by Andrzej Cybulski and published by CRC Press. This book was released on 2005-11-02 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest in structured catalysts is steadily increasing due to the already proven, as well as potential, advantages of these catalysts. Updating the comprehensive coverage of the first edition published in 1998 with the latest science and applications, Structured Catalysts and Reactors, Second Edition gives detailed information on all aspect
Download or read book Numerical Investigation of Wall Heat Conduction Effects in Catalytic Combustion Systems written by Michael Grimm and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Catalytic converters are used in a variety of applications ranging from low-temperature combustion for gas turbine applications to the removal of pollutants from engine exhaust flow. Catalytic converters currently used in industry consist of a ceramic monolithic plug. This monolithic plug has a honeycomb-like structure, and is comprised of many small cylindrical channels (tubes), the inner surfaces of which are covered with a reactive catalyst. Determining the effect of the thermal conductivity of the monolith ceramic material on the ignition, flame stability, and steady state combustion will provide a scientific foundation with regard to the selection of materials for the construction of catalytic monoliths. This effect is investigated in this study through numerical simulations. Two commonly used materials are compared: cordierite, a ceramic with a low thermal conductivity, and silicon carbide, a ceramic with a high thermal conductivity. Another issue that is critical to the design of a catalytic converter is the length of the monolith plug. The optimum length of a monolith tube is one that completely converts the incoming flow while utilizing the entire length of the catalytic coating. In practice, the length is adjusted by stacking monolith plugs end-to-end, though it is unclear how different the end-to-end plugs are when compared to a single continuous tube of the same length. This study numerically investigates the effects of this practice, with the goal to determine if a tube of length 2L exhibits the same behavior as two identical tube sections placed end-to-end, each of length L. The commercial CFD software CFD-ACE+TM was utilized to investigate the afore-stated issues. The inlet flow rates of the methane-air mixture and the fuel equivalence ratio (or fuel-air ratio) were treated as parameters. Only lean and stoichiometric mixtures were considered because in practice catalytic combustion is not performed with rich mixtures. Catalytic combustion of a methane-air mixture on a platinum catalyst was used as the candidate system because the chemistry of this system is well documented. The models were set up and tested in an order of increasing complexity to ensure steady progress in the research. Beginning with simple flow and heat transfer, the model was extended to include a single step combustion reaction, and finally a detailed reaction mechanism consisting of 24 surface reactions between 19 species. Both steady-state and transient simulations were conducted. The results show that thermal conductivity of the ceramic monolith has a large effect on ignition, flame stability, and steady state combustion. The ceramic material with a high thermal conductivity value, namely silicon carbide, produces a stable flame over a much wider range of inlet flow rates than the ceramic material with a low thermal conductivity value, namely cordierite. Over their respective ranges of ignition, for both silicon carbide and cordierite, the maximum temperature of the monolith tube is more or less the same, indicating that there is no effect of thermal conductivity on the maximum temperature. Therefore, a case can be made for using silicon carbide instead of cordierite to create catalytic monoliths capable of handling a wider variety of inlet flow rates. The results also show that the ignition and blowout limits vary significantly between split and continuous tubes at high inlet flow speeds when the monolith tube walls are constructed from materials with high thermal conductivity; in this case, silicon carbide. For high inlet flow speeds there are significant differences between split and continuous tubes for the high thermal conductivity material. For monolith tubes constructed from materials with low thermal conductivity, such as the case of cordierite, there are no significant differences between split and continuous tubes over the entire flammability range. Additionally, for high thermal conductivity materials with low inlet flow speeds and low thermal conductivity materials for all inlet flow speeds over the range of ignition, the fuel conversion percentage does not significantly change and therefore, appears to be independent of inlet flow speed. These results imply that axial heat conduction, or lack thereof due to thermal contact resistance from an air-gap between the end-to-end monolith plugs, through the walls of the monolith results in thermal non-equilibrium between the solid and fluid phase, and subsequently affects ignition and flame stability in catalytic combustion.
Download or read book High temperature Catalytic Combustion written by Marco Zwinkels and published by . This book was released on 1996 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Catalytic Combustion of Methane with Nanostructured Barium Hexaaluminate based Materials written by Juan Andrey Zarur Jury and published by . This book was released on 1999 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Catalysis written by J. J. Spivey and published by Royal Society of Chemistry. This book was released on 1999 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalysis will be of interest to anyone working in academia and industry that needs an up-to-date critical analysis and summary of catalysis research and applications.
Download or read book Natural Gas Conversion V written by A. Parmaliana and published by Elsevier. This book was released on 1998-09-17 with total page 1005 pages. Available in PDF, EPUB and Kindle. Book excerpt: On January 1988, the ascertained and economically accessible reserves of Natural Gas (NG) amounted to over 144,000 billion cubic meters worldwide, corresponding to 124 billion tons of oil equivalents (comparable with the liquid oil reserves, which are estimated to be 138 billion TOE). It is hypothesized that the volume of NG reserve will continue to grow at the same rate of the last decade. Forecasts on production indicate a potential increase from about 2,000 billion cubic meters in 1990 to not more than 3,300 billion cubic meters in 2010, even in a high economic development scenario. NG consumption represents only one half of oil: 1.9 billion TOE/y as compared to 3.5 of oil. Consequently, in the future gas will exceed oil as a carbon atom source. In the future the potential for getting energetic vectors or petrochemicals from NG will continue to grow.The topics covered in Natural Gas Conversion V reflect the large global R&D effort to look for new and economic ways of NG exploitation. These range from the direct conversion of methane and light paraffins to the indirect conversion through synthesis gas to fuels and chemicals. Particularly underlined and visible are the technologies already commercially viable.These proceedings prove that mature and technologically feasible processes for natural gas conversion are already available and that new and improved catalytic approaches are currently developing, the validity and feasibility of which will soon be documented. This is an exciting area of modern catalysis, which will certainly open novel and rewarding perspectives for the chemical, energy and petrochemical industries.
Download or read book Applied Combustion Diagnostics written by KoHse-HoingHaus and published by Taylor & Francis US. This book was released on 2002-04-26 with total page 748 pages. Available in PDF, EPUB and Kindle. Book excerpt: The editors have assembled a world-class group of contributors who address the questions the combustion diagnostic community faces. They are chemists who identify the species to be measured and the interfering substances that may be present; physicists, who push the limits of laser spectroscopy and laser devices and who conceive suitable measurement schemes; and engineers, who know combustion systems and processes. This book assists in providing guidance for the planning of combustion experiments, in judging research strategies and in conceiving new ideas for combustion research. It provides a snapshot of the available diagnostic methods and thier typical applications from the perspective of leading experts in the field.
Download or read book New and Future Developments in Catalysis written by Joanna Łojewska and published by Elsevier Inc. Chapters. This book was released on 2013-07-17 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Catalytic Combustion Over High Temperature Stable Metal Oxides written by and published by . This book was released on 1996 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Catalytic Materials written by and published by . This book was released on 1999 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
