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Regenerable Mgo Promoted Metal Oxide Oxygen Carriers For Chemical Looping Combustion
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Book Synopsis Regenerable MgO Promoted Metal Oxide Oxygen Carriers for Chemical Looping Combustion by :
Download or read book Regenerable MgO Promoted Metal Oxide Oxygen Carriers for Chemical Looping Combustion written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The disclosure provides an oxygen carrier comprised of a plurality of metal oxide particles in contact with a plurality of MgO promoter particles. The MgO promoter particles increase the reaction rate and oxygen utilization of the metal oxide when contacting with a gaseous hydrocarbon at a temperature greater than about 725.degree. C. The promoted oxide solid is generally comprised of less than about 25 wt. % MgO, and may be prepared by physical mixing, incipient wetness impregnation, or other methods known in the art. The oxygen carrier exhibits a crystalline structure of the metal oxide and a crystalline structure of MgO under XRD crystallography, and retains these crystalline structures over subsequent redox cycles. In an embodiment, the metal oxide is Fe.sub. 2O.sub. 3, and the gaseous hydrocarbon is comprised of methane.
Book Synopsis Manganese Combined Oxides as Oxygen Carriers for Chemical-looping Combustion by :
Download or read book Manganese Combined Oxides as Oxygen Carriers for Chemical-looping Combustion written by and published by . This book was released on 2014 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Iron-based Oxygen Carriers in Recyclability, Physical Strength and Toxicity-tolerance for Coal-direct Chemical Looping Combustion Systems by : Cheng Lung Chung
Download or read book Development of Iron-based Oxygen Carriers in Recyclability, Physical Strength and Toxicity-tolerance for Coal-direct Chemical Looping Combustion Systems written by Cheng Lung Chung and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents investigations of chemical looping technology as a transformative process for combustion of fossil fuels for power generation with CO2 capture. Specifically, the dissertation seeks to synthesize and characterize a low-cost iron-based oxygen carrier that can be employed in a commercial chemical looping combustion system with realistic material lifetime and adequate resistance to toxicity from pollutants from fossil fuels such as coal. Two secondary metal oxides (Al2O3 and TiO2) as support materials for Fe2O3 and their respective reaction-induced morphological changes are presented. A novel iron-based oxygen carrier was consequently identified to be sustainable over 3000 redox cycles in high temperatures (1000 °C) at the lab scale without chemical and physical degradation. Oxygen carrier of the same design also exhibited high resistance toward attrition from circulation and fluidization in two pilot-scale demonstration units under representative conditions. Tolerance of the active ingredients of the iron-based oxygen carriers against common toxic elements in the fossil fuel feedstock, such as alkaline and sulfur compounds from conversion of coal, through multiple fixed bed experiments under conditions representative of the counter-current moving bed reducer and thermogravimetric experiments up to 9000 ppm of H2S. The likelihood of agglomeration and interaction of alkaline metals (Na, K) with the iron-based oxygen carriers were found to be extremely low under normal operating conditions. Instead, proper distribution of coal was more crucial to avoid agglomeration caused by melting of SiO2. Sulfur deposition on iron-based oxygen carriers, although observed, was reversible through regeneration with air and did not result in degradation in the recyclability of the oxygen carriers. A potential pathway for sulfur emission via the combustor spent air was also identified. The sulfur emission and distribution of the Coal-Direct Chemical Looping (CDCL) 25 kWth sub-pilot unit which utilized the iron-based oxygen carriers was determined with a custom heat-traced gas sampling system. More than 69% of the total amount of atomic sulfur from high sulfur coal was converted to SO2 and H2S in the reducer flue gas stream while less than 5% was released as SO2 in the combustor spent air. The missing atomic sulfur in the balance was attributed to sulfur retained in coal ash as inorganic sulfur compounds. A flue gas clean-up system targeting both H2S and SO2 is therefore recommended to meet the quality of CO2-rich stream for transportation and sequestration in a commercial CDCL system. The projected sulfur emission in the combustor spent air was under the US EPA sulfur emission regulation safe to be released to the atmosphere without a costly acid removal system. The findings demonstrate the robustness of the CDCL system, together with the iron-based oxygen carriers, to handle high sulfur coal without severe performance and economic penalties.
Book Synopsis A Novel Mixed Metallic Oxygen Carrier for Chemical Looping Combustion by : Mohammad Rezwanul Quddus
Download or read book A Novel Mixed Metallic Oxygen Carrier for Chemical Looping Combustion written by Mohammad Rezwanul Quddus and published by . This book was released on 2013 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: In last decades, significant concerns have been raised regarding the global warming effects. To date, about one - third of the total anthropogenic CO2 emission results from power generation using fossil based fuel and CO2 is regarded as the main contributor to global warming. Therefore, technologies for efficient capture of CO2 are becoming of great value. In this respect, Chemical-Looping Combustion (CLC) has received significant attention as a promising technology facilitating concurrent CO2 capture and power generation. This non - conventional technique employs a solid carrier, known as oxygen carrier, to supply oxygen and it facilitates the combustion process in absence of N2 diluted air. Therefore, the combustion products (CO2 and water) are easily separable without any extra downstream processing cost involved in other available alternatives. However, the non- vailability of suitable oxygen carriers still hinders the commercialization of CLC. This study, thus, deals with the development of a new mixed metallic oxygen carrier, Ni-Co/La-?-Al2O3. Several characterization techniques are used to evaluate the reactivity and stability of the prepared oxygen carriers under the industrial-scale conditions of a CLC processes. Apart from the beneficia l effects of La and Co, the reducibility and the structural properties of the prepared oxygen carriers are found to be influenced significantly by the different preparation methods used. N2 adsorption isotherms show that?-Al2O3 retains its structural int egrity under some specific preparation conditions. Reducibility as determined by consecutive temperature programmed techniques resembles the chemical properties of? - and?-Al2O3 for the other preparation techniques. However, no bulk phase change is detected for all the oxygen carriers studied using XRD. The SEM/EDX and H2 chemisorption analyses show the absence of metal agglomeration and suggest that the prepared oxygen carriers are highly stable under CLC operating conditions. The prepared oxygen carriers are also tested for reactivity, stability and fluidizability in the CREC Riser Simulator using multiple reduction/oxidation cycles with CLC fuel. Results obtained show expected reducibility, oxygen carrying capacity and stability. The solid-state kinetics of the reduction processes are developed using nucleation and nuclei growth model (NNGM) and unreacted shrinking core model (USCM). The NNGM model shows better adequacy over USCM in describing the mechanism of reduction process.
Book Synopsis Development of Oxygen Carriers for Chemical Looping Combustion: The Chemical Interaction Between CuO and Silica/γ-alumina Granules with Similar Microstructure by :
Download or read book Development of Oxygen Carriers for Chemical Looping Combustion: The Chemical Interaction Between CuO and Silica/γ-alumina Granules with Similar Microstructure written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Iron and Copper Oxide Based Oxygen Carriers for Chemical Looping Applications - Structural Insight and Performance Assessment by : Nur Sena Yüzbasi
Download or read book Development of Iron and Copper Oxide Based Oxygen Carriers for Chemical Looping Applications - Structural Insight and Performance Assessment written by Nur Sena Yüzbasi and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selection of Oxygen Carriers for Chemical-looping Combustion Using Methane as a Fuel by : Marcus Johansson
Download or read book Selection of Oxygen Carriers for Chemical-looping Combustion Using Methane as a Fuel written by Marcus Johansson and published by . This book was released on 2005 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Manganese Ores as Oxygen Carriers for Chemical-looping Combustion (CLC) and Chemical-looping with Oxygen Uncoupling (CLOU). by :
Download or read book Manganese Ores as Oxygen Carriers for Chemical-looping Combustion (CLC) and Chemical-looping with Oxygen Uncoupling (CLOU). written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Systematic Investigation of the Performance of Copper-, Cobalt-, Iron-, Manganese- and Nickel-based Oxygen Carriers for Chemical Looping Combustion Technology Through Simulation Models by :
Download or read book A Systematic Investigation of the Performance of Copper-, Cobalt-, Iron-, Manganese- and Nickel-based Oxygen Carriers for Chemical Looping Combustion Technology Through Simulation Models written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selective Oxidation of 1-propanol Over Magnesium Oxide Promoted Transition Metal Oxide Catalysts by :
Download or read book Selective Oxidation of 1-propanol Over Magnesium Oxide Promoted Transition Metal Oxide Catalysts written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Manganese Ores as Oxygen Carriers for Chemical-looping Combustion by : Sebastian Sundqvist
Download or read book Manganese Ores as Oxygen Carriers for Chemical-looping Combustion written by Sebastian Sundqvist and published by . This book was released on 2017 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nanoscaled Oxygen Carrier Development for Chemical Looping Partial Oxidation of Methane by : Yan Liu
Download or read book Nanoscaled Oxygen Carrier Development for Chemical Looping Partial Oxidation of Methane written by Yan Liu and published by . This book was released on 2021 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Natural gas, which is mainly composed of methane, is an important industrial resource for syngas production. Nevertheless, the conventional methane to syngas conversion processes are highly energy intensive and suffer from low methane conversion. Chemical looping partial oxidation of methane is a promising alternative technology that consists two reactors connected by an oxygen carrier particle loop. This process has high syngas selectivity with higher energy efficiency, minimal environmental impact, and proper H2 to CO ratio for downstream operations. The major challenge for chemical looping processes is the development of high-performance oxygen carriers with high reactivity, recyclability, and recyclability. Our group employed novel iron-based oxygen carrier mixed with metal oxide support. The particles show extraordinary recyclability that sustained over 3000 redox cycles at 1000 oC without reactivity or mechanical deteriorates. Despite research efforts have been put into oxygen carrier development, there are still scopes for syngas yield and purification improvement, especially at low temperatures. In this dissertation, nanoscaled oxygen carriers are explored as oxygen carrier for chemical looping partial oxidation process. Nanoparticles have higher surface area and smaller size compared to bulk material, therefore increasing reaction rate by enhancing the surface reactivity and ionic diffusion. Mesoporous support was utilized to disperse and stabilize the nanoscaled oxygen carrier. The confinement effect of the mesopores of the support can separate the nanoparticles and prevent their aggregation during the reaction. SBA-15 supported iron oxides nanoparticles shows near 100% syngas selectivity and sustained over 75 redox cycles at 800 oC. Density functional theory calculations also indicate that nanoparticles have higher methane conversion rate and syngas selectivity. The effect of the mesoporous support structure on the reactivity of the oxygen carrier is also studied by both experiments and Dynamic Monte-Carlo simulations. With 2-D hexagonal cylindrical structure, SBA-15 can trap gas molecules and decrease the gas diffusion rate in the mesopores. While 3-D interconnected mesoporous support SBA-16 can decrease the congestion and trapping effect, therefore nanoparticles supported on SBA-16 show increased reaction rate compared with those on SBA-15. Dopant modification was also applied to nanoparticles. Nevertheless, doped iron oxide nanoparticles do not show extraordinary improvement in reactivity, stability, or selectivity, since the reactivity of the nanoparticles are not limited by surface active sites or ionic diffusivity. With the growing energy and environmental demands, chemical looping processes are facing more opportunities and challenges in oxygen carrier development. The research in this dissertation enlightens the chemical looping technology in the near future.
Book Synopsis Catalytic Modification of Oxygen Carriers for Chemical Looping Applications by : Mengqing Guo
Download or read book Catalytic Modification of Oxygen Carriers for Chemical Looping Applications written by Mengqing Guo and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The kinetics of iron-based oxygen carriers were studied as well to show the increment performance of the chemical looping process with doped iron-based oxygen carriers. With the development of chemical looping scaling up, there are more opportunities and challenges in this process and oxygen carriers. Outcomes from this research on the development of oxygen carriers throw lights on the commercialization of the chemical looping technology in the near future.
Book Synopsis Chemical-looping Combustion and Chemical-looping with Oxygen Uncoupling by : Golnar Azimi
Download or read book Chemical-looping Combustion and Chemical-looping with Oxygen Uncoupling written by Golnar Azimi and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Copper Manganese Oxides as Oxygen Carriers for Chemical Looping Air Separation for Near-zero Emission Power Generation by : Clemens Frederic Patzschke
Download or read book Copper Manganese Oxides as Oxygen Carriers for Chemical Looping Air Separation for Near-zero Emission Power Generation written by Clemens Frederic Patzschke and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nanostructured Catalysts by : Susannah L. Scott
Download or read book Nanostructured Catalysts written by Susannah L. Scott and published by Springer Science & Business Media. This book was released on 2008-04-06 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the recent advent of nanotechnology, research and development in the area of nanostructured materials has gained unprecedented prominence. Novel materials with potentially exciting new applications are being discovered at a much higher rate than ever before. Innovative tools to fabricate, manipulate, characterize and evaluate such materials are being developed and expanded. To keep pace with this extremely rapid growth, it is necessary to take a breath from time to time, to critically assess the current knowledge and provide thoughts for future developments. This book represents one of these moments, as a number of prominent scientists in nanostructured materials join forces to provide insightful reviews of their areas of expertise, thus offering an overall picture of the state-- the art of the field. Nanostructured materials designate an increasing number of materials with designed shapes, surfaces, structures, pore systems, etc. Nanostructured materials with modified surfaces include those whose surfaces have been altered via such techniques as grafting and tethering of organic or organometallic species, or through various deposition procedures including electro, electroless and vapor deposition, or simple adsorption. These materials find important applications in catalysis, separation and environmental remediation. Materials with patterned surfaces, which are essential for the optoelectronics industry, constitute another important class of surface-modified nanostructured materials. Other materials are considered nanostructured because of their composition and internal organization.
Book Synopsis Metal Nanocomposites for Energy and Environmental Applications by : Swatantra P. Singh
Download or read book Metal Nanocomposites for Energy and Environmental Applications written by Swatantra P. Singh and published by Springer Nature. This book was released on 2022-01-11 with total page 529 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on recent developments in metal nanomaterials and nanocomposites for energy and environmental application such as pollution control in water, air, and soil pollution. The chapters incorporate carbon-based, metal-based and metal-organic framework based nanomaterials and nanocomposites for emerging contaminants (pharmaceuticals and microplastics) and other traditional pollutants remediation along with energy storage, sensing of air and water polutents and carbon capture & storage (CCS). This book will be of interest to those in academia and industry involved in energy and environmental science & engineering research.
