Power and syngas production from partial oxidation of fuel-rich methane/DME mixtures in an HCCI engine

CO2 Utilization Process Simulation for Enhancing Production of Dimethyl Ether (DME)

“…us, the methanol reactor temperature of 213°C in the indirect process is the optimum temperature where there is a balance between kinetic and thermodynamic constraints [45]. e same trend is also reported by Ountaksinkul et al at reactor pressure of 50 bar, where the methanol production increased in the range of 200 to 255°C due to enhancement of reaction rate of CO 2 hydrogenation (see (2)) and then decreased with increasing the temperature due to thermodynamic equilibrium of endothermic reaction (see (4)) [42]. ere are three curves in the methanol production in the direct process: in the temperature range of 195°C to 204°C, there is an increase in methanol production due to kinetics preference of methanol formation reaction (see (2)); in the temperature range of 204°C to 276°C, there is a decrease in methanol production due to thermodynamic limitation of methanol formation reaction (see (2)) [34,42] and conversion to DME (see (1)); and in the temperature range of 267°C to 366°C, the methanol production is relatively constant at this temperature region due to the equilibrium between kinetic preference and thermodynamic limitation [30].…”

“…Afterward, the CO 2 conversion decreases up to 366°C due to thermodynamic equilibrium limitation at higher temperatures [43,44]. Meanwhile, CO 2 conversion in the direct process increases from temperatures of 195°C, reaching a maximum value of 0.13. e increase is due to the kinetic preference of methanol formation (see (2)) and DME formation (see (1)) by consuming methanol formed. Afterward, the conversion is slightly decreased until 366°C where in this range of temperatures the methanol production is slightly increased, while the DME production is slightly decreased.…”

“…World population growth and demand for higher living standards require energy resources consumed at a hasty rate. At present, an essential part of the used energy resources, especially for electricity generation and transportation, came from fossil fuels, most of which are consumed by combustion [1,2]. e increase in the world energy demand also increases the concentration of CO 2 in the atmosphere, which is one of the biggest contributors to global anthropogenic greenhouse gas (GHG) emissions.…”

“…Dimethyl ether (DME) is a potential alternative fuel to diesel used in compression ignition engines [24,25] due to its higher cetane number (55-60) and lower autoignition temperature compared to those of diesel (235°C) [26,27]. e DME can be produced through dehydration of methanol over an acidic catalyst, while methanol can be produced by the hydrogenation of CO or CO 2 over a Cu-based catalyst as shown in Reactions (1), (2), and (3) [28][29][30]. Reaction (4) is a reverse water gas shift reaction [31,32].…”

DFT Mechanistic Study of Methane Mono-Esterification by Hypervalent Iodine Alkane Oxidation Process

“…[28] There is a variety of other recent literature showing methane partial oxidation to methanol, syngas, or other products. [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] Our work on the partial oxidation of methane has focused on the search for processes efficient under less acidic environments, in particular trifluoroacetic acid (TFAH). [44] For instance, we have characterized a number of rhodium complexes with C-H activation ability in TFAH.…”