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Non Oxidative Coupling Of Methane For Use In A Hydrogen Transporting Membrane Reactor
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Book Synopsis Non-oxidative Coupling of Methane for Use in a Hydrogen Transporting Membrane Reactor by : Michael O'Neal Nutt
Download or read book Non-oxidative Coupling of Methane for Use in a Hydrogen Transporting Membrane Reactor written by Michael O'Neal Nutt and published by . This book was released on 2000 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Non-oxidative Methane Conversion on Mo/H-ZSM5 Catalysts for Use in a Hydrogen-transport Membrane Reactor by : Borry Richard Wilson
Download or read book Non-oxidative Methane Conversion on Mo/H-ZSM5 Catalysts for Use in a Hydrogen-transport Membrane Reactor written by Borry Richard Wilson and published by . This book was released on 1998 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Non-oxidative Conversion of Methane with Continuous Hydorgen Removal by :
Download or read book Non-oxidative Conversion of Methane with Continuous Hydorgen Removal written by and published by . This book was released on 1997 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective is to overcome the restrictions of non-oxidative methane pyrolysis and oxidative coupling of methane by transferring hydrogen across a selective inorganic membrane between methane and air streams, without simultaneous transport of hydrocarbon reactants or products. This will make the overall reaction system exothermic, remove the thermodynamic barrier to high conversion, and eliminate the formation of carbon oxides. Our approach is to couple C-H bond activation and hydrogen removal by passage of hydrogen atoms through a dense ceramic membrane. In our membrane reactor, catalytic methane pyrolysis produces C2+ hydrogen carbons and aromatics on the one side of the membrane and hydrogen is removed through an oxide film and combusted with air on the opposite side. This process leads to a net reaction with the stoichiometry and thermodynamic properties of oxidative coupling, but without contact between the carbon atoms and oxygen species.
Book Synopsis Non-porous Hydrogen-selective Inorganic Membranes for Methane Conversion to Higher Hydrocarbons by : Eric Chen Lu
Download or read book Non-porous Hydrogen-selective Inorganic Membranes for Methane Conversion to Higher Hydrocarbons written by Eric Chen Lu and published by . This book was released on 1999 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis OXIDATIVE COUPLING OF METHANE USING INORGANIC MEMBRANE REACTORS. by :
Download or read book OXIDATIVE COUPLING OF METHANE USING INORGANIC MEMBRANE REACTORS. written by and published by . This book was released on 1998 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research is to study the oxidative coupling of methane in catalytic inorganic membrane reactors. A specific target is to achieve conversion of methane to C2 hydrocarbons at very high selectivity and higher yields than in conventional non-porous, co-feed, fixed bed reactors by controlling the oxygen supply through the membrane. A membrane reactor has the advantage of precisely controlling the rate of delivery of oxygen to the catalyst. This facility permits balancing the rate of oxidation and reduction of the catalyst. In addition, membrane reactors minimize the concentration of gas phase oxygen thus reducing non selective gas phase reactions, which are believed to be a main route for the formation of CO(subscript x) products. Such gas phase reactions are a cause of decreased selectivity in the oxidative coupling of methane in conventional flow reactors. Membrane reactors could also produce higher product yields by providing better distribution of the reactant gases over the catalyst than the conventional plug flow reactors. Membrane reactor technology also offers the potential for modifying the membranes both to improve catalytic properties as well as to regulate the rate of the permeation/diffusion of reactants through the membrane to minimize by-product generation. Other benefits also exist with membrane reactors, such as the mitigation of thermal hot-spots for highly exothermic reactions such as the oxidative coupling of methane. The application of catalytically active inorganic membranes has potential for drastically increasing the yield of reactions which are currently limited by either thermodynamic equilibria, product inhibition, or kinetic selectivity.
Book Synopsis Integrated Catalytic Membrane Reactor for Oxidative Coupling of Methane by : Michiel Boeckx
Download or read book Integrated Catalytic Membrane Reactor for Oxidative Coupling of Methane written by Michiel Boeckx and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Methane Coupling by Membrane Reactor. Quarterly Report, June 25--September 24, 1996 by :
Download or read book Methane Coupling by Membrane Reactor. Quarterly Report, June 25--September 24, 1996 written by and published by . This book was released on 1996 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: To prevent the deep oxidation of methane catalyzed by the direct contact between methane and the dense membrane material (SrFeCo{sub 0.5}O{sub 3-x}), BaCe{sub 0.6}Sm{sub 0.4}O3 perovskite was coated on the inner surface of the dense membrane tube by the sol-gel technique. Different pretreatment methods were tested to compare their effects on the coated film. The morphology of the coated membrane was studied by SEM. The BaCe{sub 0.6}Sm{sub 0.4}O3-coated membrane which was pretreated with a basic solution before coating was more evenly covered by the coating material. The oxygen permanence through the modified membrane tube were measured at different temperatures. The oxygen permanence were found to be about 70% lower than those of the unmodified tubes. The catalytic runs were carried out with La/MgO catalyst packed inside the membrane tube. The C2 yields obtained using the dense membrane reactor were less than 4%. This may have resulted from the fact that the methane fed to the tube side was still exposed to the uncoated area of the dense membrane surface due to the incomplete coverage of the coating material (BaCe{sub 0.6}Sm{sub 0.4}O3). A hybrid dense membrane reactor, in which the oxygen was supplied by co-feeding oxygen with methane to the tube side and feeding air to the shell side, was used for the oxidative coupling of methane. Again, the inner surface of the membrane tube was coated with BaCe{sub 0.6}Sm{sub 0.4}O3 by the sol-gel technique, and the La/MgO catalyst was packed inside the membrane tube. The oxygen permanence through the membrane tube was found to be about ten times higher than that under non-reaction conditions. C2 yields up to 12% were obtained using the coated dense membrane reactor. These yields are higher than those obtained in an uncoated dense membrane reactor setup with methane and oxygen co-fed into the tube side, where the same catalyst was packed.
Book Synopsis Methane Coupling by Membrane Reactor. Quarterly Technical Progress Report, March 25--June 24, 1996 by :
Download or read book Methane Coupling by Membrane Reactor. Quarterly Technical Progress Report, March 25--June 24, 1996 written by and published by . This book was released on 1996 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The experimental study was continued on methane oxidative coupling using an oxygen-permeable dense membrane reactor. The oxygen permeance through the dense membrane was measured and preliminary experiments were conducted with the catalytic membrane reactor. The oxygen permeance was found to be similar to that obtained earlier without catalyst packing. No C2 hydrocarbons were observed in the catalytic membrane reactor for methane coupling. In order to reduce the non-selective, total oxidation activity of the dense membrane material, the inner surface of the dense membrane tube was deposited by the sol-gel technique with BaCe{sub 0.6}Sm{sub 0.4}O3, which is a catalytic, oxygen-conductive material without total oxidation catalytic activity. The dense membrane tube was examined by XRD before and after the deposition. Catalytic experiments with the coated dense membrane reactor were carried out and higher C2 selectivity was observed than with the co-feed reactor.
Book Synopsis Steady-state and Transient Catalytic Oxidation and Coupling of Methane by :
Download or read book Steady-state and Transient Catalytic Oxidation and Coupling of Methane written by and published by . This book was released on 1995 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project addresses the conversion of methane from natural gas into ethane, ethylene and higher hydrocarbons. Our research explores the mechanistic and practical implications of carrying out the methane oxidative coupling reaction in reactor designs other than conventional packed-beds with co-fed reactants. These alternate reactor designs are needed to prevent the full oxidation of methane, which limits C2, yields in methane oxidative coupling reactions. The research strategy focuses on preventing contact between the 02 reactant required for favorable overall thermodynamics and the C{sub 2+} products of methane coupling. The behavior of various reactor designs are simulated using detailed kinetic transport models. These simulations have suggested that the best way to prevent high C02 yields is to separate the oxygen and hydrocarbon streams altogether. As a result, the project has focused on the experimental demonstration of proton transport membrane reactors for the selective conversion of methane into higher hydrocarbons.
Book Synopsis Development in Oxidative Coupling of Methane Technology Using Membrane Reactor for Production of Etylene by : S. Bhatia
Download or read book Development in Oxidative Coupling of Methane Technology Using Membrane Reactor for Production of Etylene written by S. Bhatia and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Oxidative Coupling of Methane in a Dense Tubular Ceramic Membrane Reactor with High Yields by : F. T. Akin
Download or read book Oxidative Coupling of Methane in a Dense Tubular Ceramic Membrane Reactor with High Yields written by F. T. Akin and published by . This book was released on 2001 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Methane Coupling by Membrane Reactor. Quarterly Technical Progress Report, September 25, 1995--December 24, 1995 by :
Download or read book Methane Coupling by Membrane Reactor. Quarterly Technical Progress Report, September 25, 1995--December 24, 1995 written by and published by . This book was released on 1996 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of the third type of catalytic membrane reactor configuration, with catalyst deposited in the membrane and no catalyst or inert materials in the tube side, was evaluated. The C2 selectivity obtained was about 10% due to the gas phase reaction in the empty tube side of the reactor. The membrane reactor with an oxygen-permeable dense membrane has been built. The use of a dense membrane will eliminate the loss of hydrocarbon from the tube side to the shell side, as observed in the Vycor glass membrane reactor. Also, air can be used as the oxygen source without contaminating the product. La/MgO was synthesized and will be used as the catalyst for the dense membrane reactor. This catalyst was reported in the literature to show significant improvement of C2 selectivity and yield for oxidative coupling of methane in a packed-bed reactor by using the operation mode of staged-feed of oxygen. A reactor mode for methane oxidative coupling in reactors with both distributed oxygen feed and C2 product removal was developed based on the general model of cross-flow reactors reported in the last quarterly report. A distributed oxygen feed could give rise to much higher C2 yield than the co-feed reactor as long as the space time is long enough. In the case of a two-membrane reactor, where oxygen is supplied by one membrane and products are removed through the other membrane, a high separation factor of C2 product to methane for the product-removal membrane is critical to achieve high C2 yield.
Book Synopsis Oxidative Coupling of Methane to Ethylene in Packed Bed Membrane Reactor by : Norhafizah Che May
Download or read book Oxidative Coupling of Methane to Ethylene in Packed Bed Membrane Reactor written by Norhafizah Che May and published by . This book was released on 2002 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Methane Oxidative Coupling Using Membrane Reactors by : Yaping Lü
Download or read book Methane Oxidative Coupling Using Membrane Reactors written by Yaping Lü and published by . This book was released on 1996 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Methane Coupling by Membrane Reactor. Quarterly Technical Progress Report, March 25, 1995--June 24, 1995 by :
Download or read book Methane Coupling by Membrane Reactor. Quarterly Technical Progress Report, March 25, 1995--June 24, 1995 written by and published by . This book was released on 1995 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research focus, for the development of a radial flow catalytic membrane reactor for studying methane coupling concentrated on understanding the effects of pore size on improving the hydrocarbon selectivity for the reaction. The effect of pressure on the reaction was also investigated. Experimental results from the catalytic studies of oxidative coupling of methane in the radial flow membrane reactors presented in this report augment earlier work on membranes of pore diameters of 2.0[mu]m, 0.2[mu]m, and 0.02[mu]m, indicating better performance with the larger pore diameter membranes. Higher operating pressures seem to enhance gas phase non-selective reactions during methane coupling. The chemistry of oxygen conducting materials that could be used as dense membranes in the membrane reactors was investigated by studying the catalytic activity of several oxygen conducting perovskites for methane coupling. Heavy metal oxides of lanthanum, strontium and iron, which form good oxygen conductors, showed very poor methane coupling activity. Perovskites of the Strontium-Cerium-Yttribium series showed moderate activity for methane coupling. These could serve as candidates for dense membrane synthesis, since they also have moderate oxygen conduction properties.
Book Synopsis Dense Mixed-conducting Ceramic Membrane Reactor for Oxidative Coupling of Methane by : Yongxian Zeng
Download or read book Dense Mixed-conducting Ceramic Membrane Reactor for Oxidative Coupling of Methane written by Yongxian Zeng and published by . This book was released on 1998 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Methane Coupling by Membrane Reactor. Quarterly Technical Progress Report, December 25, 1995--March 24, 1996 by :
Download or read book Methane Coupling by Membrane Reactor. Quarterly Technical Progress Report, December 25, 1995--March 24, 1996 written by and published by . This book was released on 1996 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Methane oxidative coupling experiments were conducted in a packed-bed reactor using La/MgO catalyst. The results were in agreement with those reported in the literature. Oxygen permeability through an oxygen-conductive dense membrane was measured. The oxygen permeability was about 20% of the reported values and increased with the sweep flow rate of helium in the tube side. Blank runs under methane coupling conditions were carried out with no catalyst packed in the dense membrane tube. Nearly 100% CO2 selectivity was observed, suggesting that the membrane material is a facile total oxidation catalyst. After the experiment the membrane tube was analyzed by scanning electron microscopy.
