A low temperature, isothermal gas-phase system for conversion of methane to methanol over Cu–ZSM-5

2014 ◽  
Vol 50 (75) ◽  
pp. 11053-11055 ◽  
Author(s):  
T. Sheppard ◽  
C. D. Hamill ◽  
A. Goguet ◽  
D. W. Rooney ◽  
J. M. Thompson
Keyword(s):  
Low Temperature ◽  
Gas Phase ◽  
Methane Oxidation ◽  
Phase System ◽  
Conversion Of Methane ◽  
Isothermal Gas ◽  
Partial Methane Oxidation

A low temperature, recyclable process for partial methane oxidation is described over Cu–ZSM-5 using NO as the oxidant.

Low temperature oxidative conversion of methane to syngas over NiO-CaO catalyst

1992 ◽  
Vol 15 (4) ◽  
pp. 363-370 ◽  
Author(s):  
V. R. Choudhary ◽  
A. M. Rajput ◽  
B. Prabhakar
Keyword(s):  
Low Temperature ◽  
Oxidative Conversion ◽  
Conversion Of Methane ◽  
Oxidative Conversion Of Methane

Aqueous Benzene Oxidation in Low-Temperature Plasma of Pulsed Corona Discharge

2016 ◽  
Vol 19 (2) ◽  
Author(s):  
Iakov Kornev ◽  
Sergei Preis
Keyword(s):  
Low Temperature ◽  
Corona Discharge ◽  
Gas Phase ◽  
Pulse Repetition Frequency ◽  
Repetition Frequency ◽  
Pulse Repetition ◽  
Benzene Oxidation ◽  
Low Temperature Plasma ◽  
Temperature Plasma ◽  
Pulsed Corona

AbstractWastewaters polluted with non-biodegradable volatile organic compounds (VOCs), such as aromatic substances, present a growing problem meeting no adequately affordable technological response. Low-temperature plasma generated in the gas-phase pulsed corona discharge (PCD) presents competitive advanced oxidation technology in abatement of various classes of pollutants, although the process parameters, the pulse repetition frequency and the liquid spray rate, require optimization. The experimental research into aqueous benzene oxidation with PCD was undertaken to establish the impact of the parameters to the energy efficiency. The oxidation reaction was found under the experimental conditions to mostly proceed in the gas phase showing little influence of the pulse repetition frequency and the gas-liquid contact surface. Oxidation of benzene and, presumably, other volatile pollutants in the volume of PCD reactor compartment presents an effective strategy of aqueous VOCs abatement.

Effect of a Nonstationary Electric Current on the Oxide Melt–Gas Phase System

2018 ◽  
Vol 2018 (2) ◽  
pp. 197-200 ◽  
Author(s):  
S. A. Krasikov ◽  
B. T. Utelbaev ◽  
E. N. Suleimenov
Keyword(s):  
Electric Current ◽  
Gas Phase ◽  
Phase System ◽  
Oxide Melt

scholarly journals Genomic and Transcriptomic Analyses of the Facultative Methanotroph Methylocystis sp. Strain SB2 Grown on Methane or Ethanol

2014 ◽  
Vol 80 (10) ◽  
pp. 3044-3052 ◽  
Author(s):  
Alexey Vorobev ◽  
Sheeja Jagadevan ◽  
Sunit Jain ◽  
Karthik Anantharaman ◽  
Gregory J. Dick ◽  
...  
Keyword(s):  
Methane Oxidation ◽  
Coenzyme A ◽  
Draft Genome ◽  
Carbon Assimilation ◽  
Tca Cycle ◽  
Content Type ◽  
The Tca Cycle ◽  
Conversion Of Methane ◽  
Oxidative Transformations ◽  
Rate Limiting

ABSTRACTA minority of methanotrophs are able to utilize multicarbon compounds as growth substrates in addition to methane. The pathways utilized by these microorganisms for assimilation of multicarbon compounds, however, have not been explicitly examined. Here, we report the draft genome of the facultative methanotrophMethylocystissp. strain SB2 and perform a detailed transcriptomic analysis of cultures grown with either methane or ethanol. Evidence for use of the canonical methane oxidation pathway and the serine cycle for carbon assimilation from methane was obtained, as well as for operation of the complete tricarboxylic acid (TCA) cycle and the ethylmalonyl-coenzyme A (EMC) pathway. Experiments withMethylocystissp. strain SB2 grown on methane revealed that genes responsible for the first step of methane oxidation, the conversion of methane to methanol, were expressed at a significantly higher level than those for downstream oxidative transformations, suggesting that this step may be rate limiting for growth of this strain with methane. Further, transcriptomic analyses ofMethylocystissp. strain SB2 grown with ethanol compared to methane revealed that on ethanol (i) expression of the pathway of methane oxidation and the serine cycle was significantly reduced, (ii) expression of the TCA cycle dramatically increased, and (iii) expression of the EMC pathway was similar. Based on these data, it appears thatMethylocystissp. strain SB2 converts ethanol to acetyl-coenzyme A, which is then funneled into the TCA cycle for energy generation or incorporated into biomass via the EMC pathway. This suggests that some methanotrophs have greater metabolic flexibility than previously thought and that operation of multiple pathways in these microorganisms is highly controlled and integrated.

Mesoporous Silica-Supported Nanostructured PdO/CeO2 Catalysts for Low-Temperature Methane Oxidation

2017 ◽  
Vol 10 (1) ◽  
pp. 477-487 ◽  
Author(s):  
Yiling Dai ◽  
Vanama Pavan Kumar ◽  
Chujie Zhu ◽  
Mark J. MacLachlan ◽  
Kevin J. Smith ◽  
...  
Keyword(s):  
Low Temperature ◽  
Mesoporous Silica ◽  
Methane Oxidation

Pyrolysis of Methane to Higher Hydrocarbons: A Thermodynamic Study

1989 ◽  
Vol 42 (10) ◽  
pp. 1655 ◽  
Author(s):  
FP Larkins ◽  
AZ Khan
Keyword(s):  
Gas Phase ◽  
Pressure Range ◽  
Solid Carbon ◽  
Free Energies ◽  
Oxidation Of Methane ◽  
Conversion Of Methane ◽  
Equilibrium Conversion ◽  
Benzene Toluene ◽  
Higher Hydrocarbons ◽  
The Individual

Some basic thermodynamic parameters such as Gibbs free energies, enthalpies of reactions and equilibrium compositions of products from the pyrolysis and partial oxidation of methane to higher hydrocarbons in the gas phase have been determined within a consistent framework for the temperature range 800-1500 K and the pressure range 0.1-3 MPa , by using the CSIRO-SGTE THERMODATA system. It has been established that the pyrolysis of methane to higher hydrocarbons, e.g. acetylene, ethylene, ethane, prop-1-ene, propane, benzene, toluene, naphthalene, 1-methylnaphthalene and 2-methylnaphthalene, considered as separate reactions, is a highly endothermic reaction with the Gibbs free energies for the individual reactions being positive until 1300 K. The aromatics are thermodynamically most favoured with the equilibrium yields increasing with temperature. Addition of O2 lowers the heats of synthesis and the free energies for methane conversion but no enhancement in the equilibrium yields of hydrocarbons is observed. When solid carbon is allowed, it is the dominant product in all cases with the equilibrium yields for all hydrocarbons becoming negligible. Increasing the pressure at a particular temperature has more effect on the lowering of the equilibrium conversion of methane than on the suppression of solid carbon. Such data are valuable for understanding the conversion limits for methane into higher hydrocarbons.

A Developed Numerical Method for Turbulent Unsteady Fluid Flow in Two-Phase Systems with Moving Interface

2017 ◽  
Vol 14 (06) ◽  
pp. 1750063 ◽  
Author(s):  
A. M. Hegab ◽  
S. A. Gutub ◽  
A. Balabel
Keyword(s):  
Numerical Model ◽  
Gas Phase ◽  
Level Set ◽  
The Body ◽  
Phase System ◽  
Computational Domain ◽  
Two Phase ◽  
Moving Interface ◽  
Level Set Function ◽  
Gas System

This paper presents the development of an accurate and robust numerical modeling of instability of an interface separating two-phase system, such as liquid–gas and/or solid–gas systems. The instability of the interface can be refereed to the buoyancy and capillary effects in liquid–gas system. The governing unsteady Navier–Stokes along with the stress balance and kinematic conditions at the interface are solved separately in each fluid using the finite-volume approach for the liquid–gas system and the Hamilton–Jacobi equation for the solid–gas phase. The developed numerical model represents the surface and the body forces as boundary value conditions on the interface. The adapted approaches enable accurate modeling of fluid flows driven by either body or surface forces. The moving interface is tracked and captured using the level set function that initially defined for both fluids in the computational domain. To asses the developed numerical model and its versatility, a selection of different unsteady test cases including oscillation of a capillary wave, sloshing in a rectangular tank, the broken-dam problem involving different density fluids, simulation of air/water flow, and finally the moving interface between the solid and gas phases of solid rocket propellant combustion were examined. The latter case model allowed for the complete coupling between the gas-phase physics, the condensed-phase physics, and the unsteady nonuniform regression of either liquid or the propellant solid surfaces. The propagation of the unsteady nonplanar regression surface is described, using the Essentially-Non-Oscillatory (ENO) scheme with the aid of the level set strategy. The computational results demonstrate a remarkable capability of the developed numerical model to predict the dynamical characteristics of the liquid–gas and solid–gas flows, which is of great importance in many civilian and military industrial and engineering applications.

Breaking the Selectivity-Conversion Limit of Partial Methane Oxidation with Tandem Heterogeneous Catalysts

ACS Catalysis ◽  
2021 ◽  
pp. 9262-9270
Author(s):  
Kimberly T. Dinh ◽  
Mark M. Sullivan ◽  
Pedro Serna ◽  
Randall J. Meyer ◽  
Yuriy Román-Leshkov
Keyword(s):  
Methane Oxidation ◽  
Heterogeneous Catalysts ◽  
Partial Methane Oxidation
Sign in / Sign up

Export Citation Format

Share Document