Investigation of Chemical Looping Oxygen Carriers and Processes for Hydrocarbon Oxidation and Selective Alkane Oxidation to Chemicals PDF Download
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Author: Elena Yin-Yin Chung
Publisher:
ISBN:
Category :
Languages : en
Pages : 154
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Book Description
In order to overcome these process limitations, the chemical looping technology platform presents an attractive opportunity to convert hydrocarbons to flexible products utilizing intermediate oxygen carriers rather than gaseous co-fed oxidants. This study compares the traditional co-feed approach to the chemical looping approach for selectively controlling both the OCM and selective n-butane oxidation reactions with a focus on overcoming the technical issues that prevented these processes from achieving commercial application. These experimental results are used in process simulations in order to model and compare the theoretical commercial co-feed system with the commercial chemical looping system. For example, previous work demonstrated that pressure and steam have an effect on methane conversion and C2+ selectivity with the OCM co-feed and chemical looping processes. Initial simulations demonstrate that with proper heat integration, the OCM chemical looping process exhibits promising reactor and process operations for an alternative direct approach to utilize methane. The processes demonstrate that the application of chemical looping can be used as a novel and efficient approach for the conversion of hydrocarbons, especially alkanes, to electricity with CO2 capture, syngas and chemicals. With the emerging challenge of climate change and the continued escalation of energy demands, innovative and flexible fuel conversion technologies are necessary and gaining recognition. Chemical looping technologies have the potential to not only reduce energy costs, but also to mitigate carbon emissions. Historically, the general concept of this reduction-oxidation mechanism has been suggested, but the process was never commercialized. Recent interests in carbon capture techniques have revitalized the adaptive chemical looping system. Chemical looping technologies can utilize both gaseous and solid fuels such as natural gas and coal, respectively, for power, hydrogen or chemical generation. However, the success of technological adoption requires a thorough understanding of the types of chemical looping techniques, the design considerations, and the reactor modes of configurations.
Author: Elena Yin-Yin Chung
Publisher:
ISBN:
Category :
Languages : en
Pages : 154
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Book Description
In order to overcome these process limitations, the chemical looping technology platform presents an attractive opportunity to convert hydrocarbons to flexible products utilizing intermediate oxygen carriers rather than gaseous co-fed oxidants. This study compares the traditional co-feed approach to the chemical looping approach for selectively controlling both the OCM and selective n-butane oxidation reactions with a focus on overcoming the technical issues that prevented these processes from achieving commercial application. These experimental results are used in process simulations in order to model and compare the theoretical commercial co-feed system with the commercial chemical looping system. For example, previous work demonstrated that pressure and steam have an effect on methane conversion and C2+ selectivity with the OCM co-feed and chemical looping processes. Initial simulations demonstrate that with proper heat integration, the OCM chemical looping process exhibits promising reactor and process operations for an alternative direct approach to utilize methane. The processes demonstrate that the application of chemical looping can be used as a novel and efficient approach for the conversion of hydrocarbons, especially alkanes, to electricity with CO2 capture, syngas and chemicals. With the emerging challenge of climate change and the continued escalation of energy demands, innovative and flexible fuel conversion technologies are necessary and gaining recognition. Chemical looping technologies have the potential to not only reduce energy costs, but also to mitigate carbon emissions. Historically, the general concept of this reduction-oxidation mechanism has been suggested, but the process was never commercialized. Recent interests in carbon capture techniques have revitalized the adaptive chemical looping system. Chemical looping technologies can utilize both gaseous and solid fuels such as natural gas and coal, respectively, for power, hydrogen or chemical generation. However, the success of technological adoption requires a thorough understanding of the types of chemical looping techniques, the design considerations, and the reactor modes of configurations.
Author: Liang-Shih Fan
Publisher: Cambridge University Press
ISBN: 1108160417
Category : Technology & Engineering
Languages : en
Pages : 497
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Book Description
This is the first comprehensive guide to the principles and techniques of chemical looping partial oxidation. With authoritative explanations from a pioneer of the chemical looping process, you will: • Gain a holistic overview of metal oxide reaction engineering, with coverage of ionic diffusion, nanostructure formation, morphological evolution, phase equilibrium, and recyclability properties of metal oxides during redox reactions • Learn about the gasification of solid fuels, the reforming of natural gas, and the catalytic conversion of methane to olefins • Understand the importance of reactor design and process integration in enabling metal oxide oxygen carriers to produce desired products • Discover other applications of catalytic metal oxides, including the production of maleic anhydride and solar energy conversions Aspen Plus® simulation software and results accompany the book online. This is an invaluable reference for researchers and industry professionals in the fields of chemical, energy and environmental engineering, and students studying process design and optimization.
Author: Subhas Sikdar
Publisher: CRC Press
ISBN: 0429513321
Category : Science
Languages : en
Pages : 477
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Book Description
Advances in Carbon Management Technologies comprises 43 chapters contributed by experts from all over the world. Volume 1 of the book, containing 23 chapters, discusses the status of technologies capable of yielding substantial reduction of carbon dioxide emissions from major combustion sources. Such technologies include renewable energy sources that can replace fossil fuels and technologies to capture CO2 after fossil fuel combustion or directly from the atmosphere, with subsequent permanent long-term storage. The introductory chapter emphasizes the gravity of the issues related to greenhouse gas emissionglobal temperature correlation, the state of the art of key technologies and the necessary emission reductions needed to meet international warming targets. Section 1 deals with global challenges associated with key fossil fuel mitigation technologies, including removing CO2 from the atmosphere, and emission measurements. Section 2 presents technological choices for coal, petroleum, and natural gas for the purpose of reducing carbon footprints associated with the utilization of such fuels. Section 3 deals with promising contributions of alternatives to fossil fuels, such as hydropower, nuclear, solar photovoltaics, and wind. Chapter 19 of this book is freely available as a downloadable Open Access PDF at http://www.taylorfrancis.com under a Creative Commons Attribution-Non Commercial-No Derivatives (CC-BY-NC-ND) 4.0 license.
Author: Alan Haines
Publisher: Elsevier
ISBN: 0323151787
Category : Science
Languages : en
Pages : 409
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Book Description
Methods for the Oxidation of Organic Compounds: Alkanes, Alkenes, Alkynes, and Arenes is an account of the different methods used for the controlled oxidation of alkanes, alkenes, alkynes, and arenes. Most of the oxidative techniques considered are illustrated with detailed experimental procedures taken from the literature. This book is comprised of five chapters and begins with a discussion on alkanes, alkyl groups, and hydrocarbon residues. The formation of alkenes, alcohols, hydroperoxides, dialkyl peroxides, cyclic peroxides, ethers, and esters as well as aldehydes, ketones, and carboxylic acids is described, together with the aromatization of cyclic systems. The following chapters are devoted to alkenes, alkynes, and arenes and focus on the formation of compounds ranging from 1,2-diols and oxiranes (1,2-epoxides) to 1,2-dicarbonyl compounds, phenols and their derivatives, and quinones. The formation of dialkynes by oxidative coupling of 1-alkynes is described, along with the oxidative cleavage of arenes and oxidative coupling of phenols. This monograph should be of interest to organic chemists and research students.
Author: D. J. Hucknall
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 232
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Book Description
Author: Zhenlong Zhao
Publisher:
ISBN:
Category :
Languages : en
Pages : 448
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Book Description
Chemical-looping (CL) is a novel and promising technology for several applications including oxy-combustion for carbon capture, hydrogen production and CO2 reuse. In this process, oxygen carriers are utilized to cyclically adsorb and release oxygen producing two separated exhaust streams with desirable products. A rotary reactor design with micro-channel structure was developed in the Reacting Gas Dynamics Lab (RGDL) at MIT, which exhibits superior performance over conversional designs. Preliminary simulation identified OC redox kinetics and material characteristics as keys to the success of CL technology. This thesis examines the fundamentals of the reduction and oxidation (redox) processes with the aim of achieving fast and reliable reaction kinetics for CL applications. Experiments are conducted in a button-cell fixed-bed reactor with an on-line mass spectrometer. The timeresolved kinetics are modeled with consideration of thermodynamics, surface chemistry, transport mechanism, and structural evolution. Our approach, combining well-controlled experiment and detailed kinetics modeling, enables a new methodology for identifying the rate-limiting mechanism, examining the defect electrochemistry, and designing alternative materials for chemical-looping technology. Redox study with nickel thin foils reveals that structural evolution is the determining factor. Nickel oxidation starts via nucleation of oxide grains, which overlap and annihilate the fast diffusion paths. The model shows that the reaction is limited by the decreasing ionic diffusivity. To achieve practical redox repeatability, NiO fine particles supported on YSZ nanopowder is tested, and superior kinetics and cyclic stability are observed. Fast oxygen exchange is achieved from 500 to 1000°C with sufficient utilization of the carrying capacity within 1 min. Improvement is attributed to the enhanced ionic diffusivity with YSZ. The use of ceria nanopowder exhibits an order of magnitude H2 production rate improvement as compared to the state-of-the-art. Ceria reduction is slow with a threshold temperature of 700°C. The model reveals that the charge transfer is the rate-determining step for H2 production. Improving H2 splitting requires: (i) reducing the defect formation enthalpy, and (ii) accelerating charge-transfer. The addition of Zr lowers the threshold temperature to 650°C with 60% improvement in the rates, resulting from 40% decrease in the defect formation enthalpy. Doping ceria with Pr 3+ further lowers the threshold temperature to 600°C while doubling the peak rate. The model reveals that the high concentration of surface defects achieved from either approach promotes adsorbate formation, thus accelerating the splitting steps. Similar conclusions are obtained for CO2 splitting. Using the derived kinetics, H2-syngas co-production with CH4 as fuel is examined. Two important stages are identified: the formation of the complete products on oxidized surface, and syngas on the reduced surface. CH4 reduction is found to be rate-limited by the slow fuel cracking reaction. To accelerate the kinetics, a novel perovskite-nickel composite OC is examined, in which nickel effectively catalyzes reduction, leading to an order of magnitude faster kinetics at 600-700°C. This project has clearly demonstrated that using novel materials, CL technology can provide an efficient solution to oxy-combustion based CO2 capture, and H2/syngas co-production. Specifically, the use of NiO/YSZ achieves fast kinetics, robust stability and sufficient OC utilization from 500 to 1000°C, enabling complete CO2 capture with minimum energy penalty. The ceria-, and perovskite-based OCs exhibit over an order-of-magnitude faster kinetics compared to the state-of-the-art, enabling improved H2 production/CO 2 reduction efficiency isothermally at 600-700°C. In-depth understanding gained on the redox fundamentals will shed light on the design and fabrication of new materials as well as optimization of the CL applications.
Author: Ning Jiao
Publisher: John Wiley & Sons
ISBN: 1119304164
Category : Science
Languages : en
Pages : 531
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Book Description
A valuable introduction to green oxidation for organic chemists interested in discovering new strategies and new reactions for oxidative synthesis Green Oxidation in Organic Synthesis provides a comprehensive introduction and overview of chemical preparation by green oxidative processes, an entry point to the growing journal literature on green oxidation in organic synthesis. It discusses both experimental and theoretical approaches for the study of new catalysts and methods for catalytic oxidation and selective oxidation. The book highlights the discovery of new reactions and catalysts in recent years, discussing mechanistic insights into the green oxidative processes, as well as applications in organic synthesis with significant potential to have a major impact in academia and industry. Chapters are organized according to the functional groups generated in the reactions, presenting interesting achievements for functional group formation by green oxidative processes with O2, H2O2, photocatalytic oxidation, electrochemical oxidation, and enzymatic oxidation. The mechanisms of these novel transformations clearly illustrated. Green Oxidation in Organic Synthesis will serve as an excellent reference for organic chemists interested in discovering new strategies for oxidative synthesis which address the priorities of green and sustainable chemistry.
Author: Barbara K. Warren
Publisher:
ISBN:
Category : Language Arts & Disciplines
Languages : en
Pages : 472
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Book Description
Compares and contrasts complete combustion and partial oxidation. Critically reviews the latest theories on oxidation, and the factors that determine selectivity. Presents the latest advances in alkane oxidation, including methane activation. Describes novel methods of catalyst preparation and characterization. Provides examples of oxidation by nontraditional oxidants like ozone, hydrogen peroxide, sulfates/nitrates, and light.
Author: American Chemical Society. Division of Petroleum Chemistry
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 212
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Book Description
Author: Alan Haines
Publisher: Elsevier
ISBN: 0323148441
Category : Science
Languages : en
Pages : 488
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Book Description
Methods for the Oxidation of Organic Compounds: Alcohols, Alcohol Derivatives, Alkyl Halides, Nitroalkanes, Alkyl Azides, Carbonyl Compounds, Hydroxyarenes and Aminoarenes describes the different methods used for the controlled oxidation of alcohols, alcohol derivatives, alkyl halides, nitroalkanes, alkyl azides, carbonyl compounds, hydroxyarenes, and aminoarenes. Most of the oxidative techniques considered are illustrated with detailed experimental procedures taken from the literature. This book is comprised of eight chapters and begins with a discussion on the oxidation of alcohols, with particular emphasis on the formation of carbonyl compounds and carboxylic acids. The following chapters focus on the oxidation of esters and alkyl halides; ethers, acetals, and metal derivatives of alcohols; amines, nitro compounds, and azides; carbonyl compounds; 1,2-diols and related compounds; and hydroxyarenes, aminoarenes, dihydroxyarenes, diaminoarenes, and aminohydroxyarenes. Methods such as catalytic oxidation, catalytic dehydrogenation, and electrochemical and biochemical oxidation are mentioned. This monograph should be of interest to organic chemists and research students.
