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Author: Remegia Mmalewane Modibedi Publisher: ISBN: Category : Catalysis Languages : en Pages : 210
Book Description
In this study a catalyst that works at low temperature and atmospheric pressure for the oxidation of methane to methanol and formaldehyde was developed. Catalyst preparation was based on the fact that the higher activity and selectivity to the desired products obtained over supported catalysts, compared to bulk oxides, can be attributed to the formation of easily reducible supported metal oxide phases.
Author: Remegia Mmalewane Modibedi Publisher: ISBN: Category : Catalysis Languages : en Pages : 210
Book Description
In this study a catalyst that works at low temperature and atmospheric pressure for the oxidation of methane to methanol and formaldehyde was developed. Catalyst preparation was based on the fact that the higher activity and selectivity to the desired products obtained over supported catalysts, compared to bulk oxides, can be attributed to the formation of easily reducible supported metal oxide phases.
Author: Remegia Mmalewane Modibedi Publisher: ISBN: Category : Catalysis Languages : en Pages : 344
Book Description
This thesis described the development of new catalytic system for the conversion of natural gas (methane) to liquid products such as methanol and formaldehyde. This technology can allow the exploitation of small and medium size gas fields without the need to build an expensive gas to liquid plants or long pipelines. The technology is based on a concept of non-separating membrane reactor where an inorganic membrane paper serves as a catalyst support through which a reaction mixture is flowing under mild conditions and short residence times.
Author: Vladimir Arutyunov Publisher: Elsevier ISBN: 0444632514 Category : Technology & Engineering Languages : en Pages : 321
Book Description
Direct Methane to Methanol: Foundations and Prospects of the Process offers a state-of-the-art account of one of the most interesting and potentially commercial technologies for direct conversion of natural gas into valuable chemicals. The book thoroughly explains the complex and unusual chemistry of the process, as well as possible applications for direct methane to methanol (DMTM). It covers topics involving thermokinetics, pressure, direct oxidation of heavier alkanes, and more, and provides detailed appendices with experimental data and product yields. This book provides all those who work in the field of gas processing and gas chemistry with the theory and experimental data to develop and apply new processes based on direct oxidation of natural gas. All those who deal with oil and natural gas production and processing will learn about this promising technology for the conversion of gas into more valuable chemicals. Reviews more than 350 publications on high-pressure, low-temperature oxidation of methane and other gas phase hydrocarbons Contains rare material available for the first time in English Explains the reasons of previous failure and outlines the way forward for commercial development of the conversion technology Presents a deep theoretical knowledge of this complex conversion process
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Methane is oxidized by air in acetonitrile solution to give methyl hydroperoxide (easily reduced to methanol), formaldehyde and formic acid in the presence of [NBu4]VO3- yrazine-2-carboxylic acid as the catalyst and H2O2 as a promoter.
Author: Hui Song Publisher: Springer Nature ISBN: 9813341572 Category : Science Languages : en Pages : 152
Book Description
This book demonstrates that solar energy, the most abundant and clean renewable energy, can be utilized to drive methane activation and conversion under mild conditions. The book reports that coupling solar energy and thermal energy can significantly enhance methane conversion at mild temperatures using plasmonic nanometal-based catalysts, with a substantial decrease in apparent activation energy of methane conversion. Furthermore, this book, for the first time, reports the direct photocatalytic methane oxidation into liquid oxygenates (methanol and formaldehyde) with only molecular oxygen in pure water at room temperature with high yield and selectivity over nanometals and semiconductors (zinc oxide and titanium dioxide). These findings are a big stride toward methane conversion and inspire researchers to develop strategies for efficient and selective conversion of methane to high-value-added chemicals under mild conditions.
Author: Anand S. Chellappa Publisher: ISBN: Category : Methane Languages : en Pages : 520
Book Description
The direct partial oxidation of methane to methanol was investigated in two separate parts, namely, (a) without any catalyst (homogeneous reaction), and (b) with a catalyst. In the absence of a catalyst, the effect of increasing levels of CO$\sb2$ and N$\sb2$ in the feed was studied at reaction conditions giving high oxygen conversions. Increasing CO$\sb2$ levels in the feed (3% to 15%) did not have an adverse effect on methane conversion and methanol selectivity, but increased HCHO selectivity to a small extent. Increasing O$\sb2$ concentrations $\rm(CH\sb4/O\sb2$ feed ratio of 8 to 16) in the feed, was found to increase the HCHO/CH$\sb3$OH ratio, as well as temperature required for high conversions. Kinetic modeling studies were also carried out using a free radical scheme consisting of a set of 46 elementary reactions. The model predicts that increasing H$\sb2$ levels in the feed at high oxygen conversions, decreases methanol selectivity without affecting methane conversion. Methane conversion of 7%, and a methanol selectivity of 54% at 703 K and 34 bar obtained in this study, compares well with the values reported in the literature. The catalysts tested were ferric molybdate, with Mo/Fe atomic ratios varying from 1 to 5, iron phosphate and boron phosphate. These studies were carried out over the same pressure and flow ranges used in part (a), but with the $\rm CH\sb4/O\sb2$ ratio at 16/1. A comparison of the different catalysts at similar conversion levels, showed that the phosphate catalysts were more favorable to formaldehyde, than the ferric molybdate catalyst. With respect to the latter catalyst, no significant change in the conversions and selectivities were observed by changing the Mo/Fe ratio, although the ratio 3.0 (MF3), was found to slightly more selective to methanol. For the MF3 catalyst, an empirical model was developed using a simple series-parallel scheme consisting of three reactions. In the range of conditions employed, the product yields and methane conversions calculated using the model were in good agreement with the experimental results.
Author: D.M. Bibby Publisher: Elsevier ISBN: 0080960707 Category : Technology & Engineering Languages : en Pages : 759
Book Description
This proceedings volume comprises the invited plenary lectures, contributed and poster papers presented at a symposium organised to mark the successful inauguration of the world's first commercial plant for production of gasoline from natural gas, based on the Mobil methanol-to-gasoline process. The objectives of the Symposium were to present both fundamental research and engineering aspects of the development and commercialization of gas-to-gasoline processes. These include steam reforming, methanol synthesis and methanol-to-gasoline. Possible alternative processes e.g. MOGD, Fischer-Tropsch synthesis of hydrocarbons, and the direct conversion of methane to higher hydrocarbons were also considered.The papers in this volume provide a valuable and extremely wide-ranging overview of current research into the various options for natural gas conversion, giving a detailed description of the gas-to-gasoline process and plant. Together, they represent a unique combination of fundamental surface chemistry catalyst characterization, reaction chemistry and engineering scale-up and commercialization.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
A mixture of sodium vanadate and pyrazine-2-carboxylic acid (pcaH) efficiently catalyses the reaction of methane with molecular oxygen (from air) and hydrogen peroxide to give methyl hydroperoxide and, as consecutive products, methanol and formaldehyde. The reaction takes place under mild conditions (25-75 °C) either in aqueous or in acetonitrile solution. The complexes formed from the catalyst precursor and the co-catalyst (under the reaction conditions) have been isolated and characterized as the derivatives [VO2(pca)2]- (1) and [VO(O2) (pca)2]- (3). The implications of these species in the catalytic process are discussed.
Author: Remegia Mmalewane Modibedi
Author: Remegia Mmalewane Modibedi
Author: Remegia Mmalewane Modibedi
Author: Vladimir Arutyunov
Author: 
Author: Hui Song
Author: Anand S. Chellappa
Author: D.M. Bibby
Author: B. K. Hodnett
Author: Maria-Guadalupe Cardenas-Galindo
Author: