scholarly journals Raman Spectroscopy Study on Chemical Transformations of Propane at High Temperatures and High Pressures

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Daniil A. Kudryavtsev ◽  
Timofey М. Fedotenko ◽  
Egor G. Koemets ◽  
Saiana E. Khandarkhaeva ◽  
Vladimir G. Kutcherov ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Upper Mantle ◽  
High Pressures ◽  
Chemical Transformations ◽  
Spectroscopy Study ◽  
Heavy Hydrocarbons ◽  
Thermobaric Conditions ◽  
Diamond Anvil ◽  
Laser Heated

AbstractThis study is devoted to the detailed in situ Raman spectroscopy investigation of propane C3H8 in laser-heated diamond anvil cells in the range of pressures from 3 to 22 GPa and temperatures from 900 to 3000 K. We show that propane, while being exposed to particular thermobaric conditions, could react, leading to the formation of hydrocarbons, both saturated and unsaturated as well as soot. Our results suggest that propane could be a precursor of heavy hydrocarbons and will produce more than just sooty material when subjected to extreme conditions. These results could clarify the issue of the presence of heavy hydrocarbons in the Earth’s upper mantle.

In situ Raman spectroscopic technique for high-pressure studies of mineral and fluid inclusions formation 

2021 ◽  
Author(s):  
Nadezda Chertkova ◽  
Anna Spivak ◽  
Egor Zakharchenko ◽  
Yuriy Litvin ◽  
Oleg Safonov ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Diamond Anvil Cell ◽  
High Pressures ◽  
Rapid Development ◽  
Spectroscopic Technique ◽  
Diamond Growth ◽  
Russian Science ◽  
Geological Processes ◽  
Diamond Anvil

<p>Rapid development of <em>in situ</em> experimental techniques provides researchers with new opportunities to model geological processes, which take place deep in the Earth’s interior. Raman spectroscopy is considered a powerful analytical tool for investigation of the samples subjected to high pressures in a diamond anvil cell, since in such experiments phase assemblages can be determined in real time using measured Raman spectra.</p><p>In this study, we describe experimental methods for <em>in situ</em> observation and spectroscopic analysis of fluids and minerals, which constitute environment for diamond growth, at the upper mantle pressure conditions. Experiments were conducted in the externally heated, “piston-cylinder” type diamond anvil cell at pressures exceeding 6 GPa and temperatures up to 600 degree C. Phase relationships and fluid speciation were monitored during experiments to reconstruct the environment and mechanism of inclusions formation. Compared to other analytical tools, commonly used in combination with diamond anvil cell apparatus, Raman spectroscopy offers several advantages, such as short sample preparation time, non-destructive characterization of the phases observed in the sample chamber and relatively short measurement time.</p><p>This work was supported by grant No. 20-77-00079 from the Russian Science Foundation.</p>

In situ Raman spectroscopy with laser-heated diamond anvil cells

2005 ◽  
pp. 413-423
Author(s):  
Mario Santoro ◽  
Jung-Fu Lin ◽  
Viktor V. Struzhkin ◽  
Ho-kwang Mao ◽  
Russell J. Hemley
Keyword(s):  
Raman Spectroscopy ◽  
Diamond Anvil Cells ◽  
In Situ Raman Spectroscopy ◽  
In Situ Raman ◽  
Diamond Anvil ◽  
Laser Heated

p-Aminobenzoic acid polymorphs under high pressures

RSC Advances ◽  
2014 ◽  
Vol 4 (30) ◽  
pp. 15534-15541 ◽  
Author(s):  
Tingting Yan ◽  
Kai Wang ◽  
Defang Duan ◽  
Xiao Tan ◽  
Bingbing Liu ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
High Pressure ◽  
Diamond Anvil Cell ◽  
High Pressures ◽  
Aminobenzoic Acid ◽  
Aminobenzoic Acids ◽  
Diamond Anvil

The effect of high pressure on two forms (α, β) of p-aminobenzoic acids (PABA) is studied in a diamond anvil cell using in situ Raman spectroscopy.

High Pressure in situ Micro-Raman Spectroscopy of Ge-Sn System Synthesized in a Laser Heated Diamond Anvil Cell

2011 ◽  
Author(s):  
Y. A. Sorb ◽  
N. Subramanian ◽  
T. R. Ravindran ◽  
P. Ch. Sahu ◽  
Alka B. Garg ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
High Pressure ◽  
Diamond Anvil Cell ◽  
Micro Raman Spectroscopy ◽  
Diamond Anvil ◽  
Laser Heated

scholarly journals Experimental Issues in In-Situ Synchrotron X-Ray Diffraction at High Pressure and Temperature by Using a Laser-Heated Diamond-Anvil Cell

1997 ◽  
Vol 499 ◽  
Author(s):  
C. S. Yoo ◽  
H. Cynn ◽  
A. Campbell ◽  
J.-Z. Hu
Keyword(s):  
Diamond Anvil Cell ◽  
High Pressures ◽  
Thermal Gradients ◽  
X Ray Diffraction ◽  
High Pressure And Temperature ◽  
X Ray ◽  
Diamond Anvil ◽  
Integrated Technique ◽  
Laser Heated

ABSTRACTAn integrated technique of diamond-anvil cell, laser-heating and synchrotron x-ray diffraction technologies is capable of structural investigation of condensed matter in an extended region of high pressures and temperatures above 100 GPa and 3000 K. The feasibility of this technique to obtain reliable data, however, strongly depends on several experimental issues, including optical and x-ray setups, thermal gradients, pressure homogeneity, preferred orientation, and chemical reaction. In this paper, we discuss about these experimental issues together with future perspectives of this technique for obtaining accurate data.

scholarly journals Formation of complex hydrocarbon systems from methane at the upper mantle thermobaric conditions

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Aleksandr Serovaiskii ◽  
Vladimir Kutcherov
Keyword(s):  
Upper Mantle ◽  
Theoretical Calculations ◽  
Extreme Temperature ◽  
Hydrocarbon Mixture ◽  
Chemical Transformations ◽  
Product Systems ◽  
Thermobaric Conditions ◽  
Diamond Anvil ◽  
Temperature And Pressure ◽  
Hydrocarbons Synthesis

AbstractThe existence of methane in the Earth’s mantle does not cause any doubt, however, its possible chemical transformation under the mantle thermobaric conditions is not enough known. Investigation of methane at the upper mantle thermobaric conditions, using diamond anvil cells, demonstrated the possible formation of ethane, propane and n-butane from methane, however, theoretical calculations of methane behaviour at extreme temperature and pressure predicted also heavier hydrocarbons. We experimentally investigated the chemical transformations of methane at the upper mantle thermobaric conditions, corresponding to the depth of 70–80 km (850–1000 K, 2.5 GPa), using “Toroid”-type Large reactive volume device and gas chromatography. The experimental results demonstrated the formation of the complex hydrocarbon mixture up to C7 with linear, branched and cycled structures and benzene. Unsaturated hydrocarbons were detected on the trace level in the products mixture. The increasing of exposure time leaded to growth of heavier components in the product systems. The data obtained suggest possible existence of complex hydrocarbon mixtures at the upper mantle thermobaric conditions and provide a new insight on the possible pathways of the hydrocarbons synthesis from methane in the upper mantle.

In situ high pressure-temperature Raman spectroscopy technique with laser-heated diamond anvil cells

2004 ◽  
Vol 75 (10) ◽  
pp. 3302-3306 ◽  
Author(s):  
Jung-Fu Lin ◽  
Mario Santoro ◽  
Viktor V. Struzhkin ◽  
Ho-kwang Mao ◽  
Russell J. Hemley
Keyword(s):  
Raman Spectroscopy ◽  
High Pressure ◽  
Spectroscopy Technique ◽  
Diamond Anvil Cells ◽  
Diamond Anvil ◽  
Laser Heated

In situ synchrotron X-ray diffraction with laser-heated diamond anvil cells study of Pt up to 95 GPa and 3150 K

RSC Advances ◽  
2015 ◽  
Vol 5 (19) ◽  
pp. 14603-14609 ◽  
Author(s):  
Xiaoli Huang ◽  
Fangfei Li ◽  
Qiang Zhou ◽  
Gang Wu ◽  
Yanping Huang ◽  
...  
Keyword(s):  
X Ray Diffraction ◽  
Diamond Anvil Cells ◽  
X Ray ◽  
Diamond Anvil ◽  
Laser Heated

In situ synchrotron X-ray diffraction with laser-heated diamond anvil cells study the EOS of Pt.

The Fluorescence of Diamond and Raman Spectroscopy at High Pressures Using a New Design of Diamond Anvil Cell

1973 ◽  
Vol 27 (5) ◽  
pp. 377-381 ◽  
Author(s):  
D. M. Adams ◽  
S. J. Payne ◽  
K. Martin
Keyword(s):  
Raman Spectroscopy ◽  
Diamond Anvil Cell ◽  
High Pressures ◽  
Fluorescence Emission ◽  
Type I ◽  
High Pressure Cell ◽  
Scattering Geometry ◽  
Infrared And Raman Spectroscopy ◽  
Bond Stretching ◽  
Diamond Anvil

A new design of diamond anvil high pressure cell suitable for use in infrared and Raman spectroscopy is described. Its performance is demonstrated with particular reference to the pressure dependence of the infrared spectrum of K2PtCl6 and the Raman spectrum of W(CO)6. In contrast to earlier reports, in which forward scattering geometry was used, this design of cell is shown to be very suitable for Raman use in the 180° excitation mode. However, severe limitations are imposed by the fluorescence emission of diamond and of sapphire. Conditions under which the cell can be used for Raman work are summarized. New fluorescence and Raman features are reported for diamond. In particular, a band at 1730 cm−1 is characteristic of type I stones and may be due to C to N bond stretching at defect centers.

Sign in / Sign up

Export Citation Format

Share Document