Download or read book Preparation of Magnesium Oxide Supports for Oxidative Coupling of Methane Catalysts written by Xianhe Deng and published by . This book was released on 2014 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of nano-sized magnesium oxide particles with both high and low surface areas were successfully prepared by a simple water/toluene reverse microemulsion method using triton X-45, 1-Dodecanol as surfactant. By controlling the amount of surfactant, it is possible to control the size of MgO nanoparticles from 20 nm to 50 nm. The size was confirmed by X-ray diffraction (XRD). In order to investigate the reactivity of OCM reaction over the magnesium oxide support, a series of catalysts were also synthesized. High surface area MgO samples prepared by microemulsion were used as support for Li-TbOx, where 1.75 \U+2264\ x \U+2264\ 2. In order to get the largest coverage of the MgO support and the smallest Li-TbOx particles, a nitrate precursor was used during incipient wetness impregnation, followed by calcination at 800 °C for 4 hours. Another MgO-supported Li-TbOx catalyst was prepared using the same method with the low surface area MgO nanoparticles. Low surface area MgO nanoparticles were also used as OCM catalysts after calcination at 800 °C for 4 hours. N2 adsorption (BET) results showed that the surface area of the catalysts supported on MgO nanoparticles prepared using 15 wt% Triton X-45 was as low as 1.0 m3/g, while the surface area of the catalyst prepared using MgO particle, synthesized with 15 wt% Triton X-45 and 1-Dodecanol mixture was 9.3 m3/g. Oxidative coupling of methane (OCM) catalyzed by the prepared catalysts was studied using a continuous-flow quartz reactor at atmospheric pressure, 500-800 °C at a CH4:O2 ratio of 4:1. The methane conversion reached 21.9% at 700 °C with a C2+ selectivity as high as 65.5%. Thus, a maximum C2+ yield of 13.5% was realized. However, there was a rapid deactivation during the OCM over Li-doped catalysts due to the loss of Lithium.
Download or read book Oxidative Coupling of Methane Over Chloride modified Magnesium Oxide Catalysts written by Paul Gary Hinson and published by . This book was released on 1996 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oxidative Coupling of Methane Over MgO supported Perovskite Catalysts written by Dan Li (M.S.) and published by . This book was released on 1997 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Oxidative Coupling of Methane by Metal Oxides and Phosphates written by Robert Lawrence Tatterson and published by . This book was released on 1992 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Catalysis and the Mechanism of Methane Conversion to Chemicals written by Toshihide Baba and published by Springer Nature. This book was released on 2020-04-18 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces various types of reactions to produce chemicals by the direct conversion of methane from the point of view of mechanistic and functional aspects. The chemicals produced from methane are aliphatic and aromatic hydrocarbons such as propylene and benzene, and methanol. These chemicals are created by using homogeneous catalysts, heterogeneous catalysts such as zeolites, and biocatalysts such as enzymes. Various examples of methane conversion reactions that are discussed have been chosen to illustrate how heterogeneous and homogenous catalysts and biocatalysts and/or their reaction environments control the formation of highly energetic species from methane contributing to C-C and C-O bond formation.
Download or read book Catalyst Development for the Oxidative Coupling of Methane Utilizing Rare Earth Oxide Based Catalysts written by Trenton W. Elkins and published by . This book was released on 2014 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: The alkali doped TbOx/n-MgO catalysts. The Li-TbOx/n-MgO catalyst was found to be more active and stable than supported samaria based catalysts, which is an incredible result. Furthermore, the deactivation associated with lithium doped catalysts was greatly reduced for our coimpregnated lithium containing catalyst and the Na-TbOx/n-MgO catalyst shows minimal deactivation under the same reaction conditions and is the most productive REO containing catalyst discovered in literature when considering production levels with long times on stream.
Download or read book Methyl Radical Formation Over Metal Oxide Catalysts written by Kenneth Dwight Campbell and published by . This book was released on 1987 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oxidative Coupling of Methane Over MnO R MgO and CoO R MgO Mixed Oxide Catalysts written by Tommy K.M.* Chan and published by . This book was released on 1989 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanistic Studies on the Oxidative Coupling of Methane written by Chunlei Shi and published by . This book was released on 1993 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oxidative Coupling of Methane Over Li MgO Catalyst written by Saeed M. S. Al-Zahrani and published by . This book was released on 1994 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bimetallic Catalysts written by John H. Sinfelt and published by Wiley-Interscience. This book was released on 1983-09-29 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents an account of the research on bimetallic catalysts. Focuses attention on the possibility of influencing the selectivity of chemical transformations on metal surfaces and preparing metal alloys in a highly dispersed state. Covers the validation and elucidation of the bimetallic cluster concept. Includes figures and tables.
Download or read book Mechanism Imposed Limitations on the Yield of Higher Hydrocarbons from the Oxidative Coupling of Methane and Alternate Approaches to Methane Conversion written by and published by . This book was released on 1991 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The conversion of methane to higher hydrocarbons via oxidative coupling over metal oxide catalysts is the subject of intense study as a route for natural gas upgrading. Detailed study on the reaction of methane over a mixed manganese-magnesium oxide implicates a mechanism involving generation of methyl radicals at the surface, followed by radical coupling as well as other radical reactions in the gas phase as the predominant mode of carbon-carbon bond formation. Analysis of the consequences of this mechanisms suggests that there is an inherent limit on yield, including a major adverse pressure effect, that may severely impact the potential utility of this route. Among several possible approaches to circumventing this limitation, a novel class of catalyst - transition metal-exchanged P -alumina -- has been found to be highly active for complete oxidation of methane. Results of catalytic and characterization studies will be presented.
Download or read book The Oxidative Coupling of Methane Over Doped Li MgO Catalysts written by Gerrie Christine Hoogendam and published by . This book was released on 1996 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis of Micelle Templated Metal Oxides as Catalysts for the Oxidative Coupling of Methane written by and published by . This book was released on 2014 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Natural Gas Conversion written by A. Holmen and published by Elsevier. This book was released on 1991-05-27 with total page 585 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings reflect the extensive fundamental and applied research efforts that are currently being made on the conversion of gas, in particular on the direct conversion of methane. The Symposium in Oslo focused on the following topics: Direct conversion of methane, Fischer-Tropsch chemistry, methanol conversion and natural gas conversion processes. The main aim was to present the state-of-the-art and progress currently being made within each of these areas. The book contains the papers presented and includes plenary lectures, short communications and posters. The papers will be of interest to scientists and engineers working in the field of gas conversion, transportation fuels, primary petrochemicals and catalysis.
Download or read book Catalysis written by James Spivey and published by Royal Society of Chemistry. This book was released on 2019-03-15 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalysts are required for a variety of applications and researchers are increasingly challenged to find cost effective and environmentally benign catalysts to use. This volume looks at modern approaches to catalysis and reviews the extensive literature including direct methane conversion, nanocomposite catalysts for transformation of biofuels into syngas and hydrogen, and catalytic wet air oxidation technology for industrial wastewater treatment. Appealing broadly to researchers in academia and industry, it will be of great benefit to any researcher wanting a succinct reference on developments in this area now and looking to the future.
Download or read book Methane Conversion by Oxidative Processes written by Wolf and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: A reasonable case could be made that the scientific interest in catalytic oxidation was the basis for the recognition of the phenomenon of catalysis. Davy, in his attempt in 1817 to understand the science associated with the safety lamp he had invented a few years earlier, undertook a series of studies that led him to make the observation that a jet of gas, primarily methane, would cause a platinum wire to continue to glow even though the flame was extinguished and there was no visible flame. Dobereiner reported in 1823 the results of a similar investigation and observed that spongy platina would cause the ignition of a stream of hydrogen in air. Based on this observation Dobereiner invented the first lighter. His lighter employed hydrogen (generated from zinc and sulfuric acid) which passed over finely divided platinum and which ignited the gas. Thousands of these lighters were used over a number of years. Dobereiner refused to file a patent for his lighter, commenting that "I love science more than money." Davy thought the action of platinum was the result of heat while Dobereiner believed the ~ffect ~as a manifestation of electricity. Faraday became interested in the subject and published a paper on it in 1834; he concluded that the cause for this reaction was similar to other reactions.
