Results 241 to 250 of about 354,003 (282)

Pressure broadening in Raman spectra of CH4–N2, CH4–CO2, and CH4–C2H6 gas mixtures

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2023
Different molecular environments change the spectrum of a given gas sample involved in a mixture compared to the spectrum of a pure gas. It is necessary to account for this effect to improve the accuracy of the analysis of the natural gas composition by Raman spectroscopy.
Aleksandr S, Tanichev, Dmitry V, Petrov
openaire   +2 more sources

Photoacoustic study of ch4 (v2, v4) deactivation in CH4-CH4 and CH4-monoatomic collisions

Chemical Physics Letters, 1982
Abstract Energy transfer between the first two vibrational levels v 2 , v 4 of the CH 4 molecule and the transition-rotation degrees or freedom is studied experimentally using the photoacoustic method V → TR rate constants are determined for pure CH 4 , CH 4 -He, CH 4 -Ne and CH 4 -Ar mixtures between 140 and 373 K.
openaire   +1 more source

Accurate rovibrational spectroscopy of relevant astrochemical complexes: CH4⋯CH4, CH4⋯N2 and CH4⋯Ar

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
Rovibrational spectroscopic properties of CH4⋯CH4, CH4⋯N2, and CH4⋯Ar weakly bound complexes are relevant to astrophysics and astrochemistry, with particular interest to research on Titan's atmosphere. Different methodologies were applied to achieve the high accuracy required to fill the data gap in the literature of these complexes, particularly ...
Cassius M C, Carvalho, Ricardo, Gargano, João B L, Martins, José Roberto S, Politi   +3 more
openaire   +2 more sources

Rotational tunneling in CH4 under pressure (CH4 III)

The Journal of Chemical Physics, 1982
High resolution neutron inelastic scattering techniques were used to measure tunneling spectra of methane (CH4) in its phase III. By increasing the pressure from 0.6 to 1.8 kbar the tunneling lines shift by about a factor of 1.5. The rather complicated spectra can be equally well described by two simple structural models.
M. Prager, W. Press, A. Heidemann, C. Vettier   +3 more
openaire   +1 more source

Dynamics of CH4 oxidation in landfill biocover soil: Effect of O2/CH4 ratio on CH4 metabolism

Environmental Pollution, 2012
The CH(4) oxidation dynamics was investigated by observing the CH(4) oxidation rates at concentrations (from 1.0 × 10(4) ppmv to 2.0 × 10(5) ppmv) mixed with O(2) (from 5.0 × 10(4) ppmv to 7.5 × 10(5) ppmv). The CH(4)-O(2) dual-substrate model based on Michaelis-Menten equation (K(m, CH4) = 1.4 × 10(5) ppmv; V(max) = 7.6 × 10(2) μmol kg(-1) d(-1); K(m,
Zi-Fang, Chi, Wen-Jing, Lu, Huai, Li, Hong-Tao, Wang   +3 more
openaire   +2 more sources

CO2/CH4, CH4/H2 and CO2/CH4/H2 separations at high pressures using Mg2(dobdc)

Microporous and Mesoporous Materials, 2012
High-pressure separations of binary and ternary mixtures of CO2, CH4, and H2 are relevant to carbon dioxide capture as well as hydrogen and natural gas purification. Metal-organic frameworks represent a class of porous materials that could be used to accomplish these separations, and Mg2(dobdc) (dobdc4− = 1,4-dioxido-2,5-benzenedicarboxylate), also ...
Herm, Z.R., Krishna, R., Long, J.R.
openaire   +2 more sources

Kinetic models for the CH4(ν3) deactivation in CH4-CH4 collisions. Interpretation of experimental results

Chemical Physics Letters, 1983
Abstract Various kinetic models for the CH 4 (ν 3 ) deactivation in CH 4 -CH 4 collisions at low temperatures ( T ⪅ 300 K) are proposed and applied to interpret recently published experimental results. We discuss the value of the rate constant of the single-quantum process CH 4 (2ν 4 ) → CH 4 (ν 4 ) (V-T,R process).
J. Laterrasse, M. Huetz-Aubert
openaire   +1 more source

Co-processing CH4 and oxygenates on Mo/H-ZSM-5: 2. CH4–CO2 and CH4–HCOOH mixtures

Physical Chemistry Chemical Physics, 2013
Co-processing of formic acid or carbon dioxide with CH4 (FA/CH4 = 0.01-0.03 and CO2/CH4 = 0.01-0.03) on Mo/H-ZSM-5 catalysts at 950 K with the prospect of kinetically coupling dehydrogenation and deoxygenation cycles results instead in a two-zone, staged bed reactor configuration consisting of upstream oxygenate/CH4 reforming and downstream CH4 ...
Jeremy, Bedard, Do-Young, Hong, Aditya, Bhan   +2 more
openaire   +2 more sources

The influence of rotation on the vibrational relaxation of the CH4 molecule. Study of the transfers CH4(ν2) + Ar → CH4(0) + Ar and CH4(ν4) + Ar → CH4(0) + Ar

Chemical Physics, 1983
Abstract The influence of rotational energy transfers on the vibrational relaxation of the ν 2 and ν 4 modes of CH 4 are studied. The interaction matrix is built up in the framework of the semiclassical coupled-states approximation using the asymptotic expression of (3 j ) symbols. It is assumed that the intermolecular potential is the sum of five
Georges Jolicard, Marie-Yvonne Perrin
openaire   +1 more source