Author: Dan Li (M.S.)Publisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 198
Book Description
Oxidative Coupling of Methane Over MgO-supported Perovskite Catalysts
Author: Dan Li (M.S.)Publisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 198
Book Description
Oxidative Coupling of Methane Over Li/MgO Catalyst
Author: Saeed M. S. Al-ZahraniPublisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 554
Book Description
The Oxidative Coupling of Methane Over Doped Li/MgO Catalysts
Author: Gerrie Christine HoogendamPublisher:
ISBN: 9789090092676
Category :
Languages : en
Pages : 126
Book Description
Preparation of Magnesium Oxide Supports for Oxidative Coupling of Methane Catalysts
Author: Xianhe DengPublisher:
ISBN:
Category :
Languages : en
Pages : 51
Book Description
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.
Mechanistic Studies on the Oxidative Coupling of Methane
Author: Chunlei ShiNatural Gas Conversion V
Author: A. ParmalianaPublisher: Elsevier
ISBN: 0080537308
Category : Technology & Engineering
Languages : en
Pages : 1005
Book Description
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.
Oxidative Coupling of Methane Over MnO R-MgO and CoO R-MgO Mixed Oxide Catalysts
Author: Tommy K.M.* ChanOxidative Coupling of Methane Over Chloride-modified Magnesium Oxide Catalysts
Author: Paul Gary HinsonCatalytic Oxidative Coupling of Methane Over Li/MgO Using N2O as an Oxidant
Author: Hiroshi YamamotoPublisher:
ISBN:
Category : Methane
Languages : en
Pages : 222
Book Description
Methane Conversion by Oxidative Processes
Author: Eduardo E. WolfPublisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 566
Book Description
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.