2 edition of mass spectrometric study of the low pressure oxygen reactivity of carbon and graphite. found in the catalog.
mass spectrometric study of the low pressure oxygen reactivity of carbon and graphite.
Clive Merton Freedman
MSc thesis, Physics.
Secondary ion mass spectrometry has been used to study the chemisorption of oxygen on W(). Plots of O/sup -/ versus O/sup +/ and WO/sup -//sub 2/ versus O/sup +/ show large hysteresis in the adsorption-desorption cycle. To obtain the exclusive mass isotope distribution of the carbon skeleton, the GC-MS data are corrected for the naturally occurring isotopes of oxygen (O), nitrogen (N), hydrogen (H), silicon (Si), sulfur (S), and carbon (C) atoms in the derivatization agent .
One of the most profound findings in cosmochemistry has been the isolation and study of presolar grains recovered from carbonaceous chondrites, which are ancient meteorites (1 –3).A particularly striking example is the micrometer-sized low-density graphite grains of supernovae origin (1, 4).This discovery was due to identification of noble gas isotopic anomalies identified by mass Cited by: The oxidation of toluene was studied in a jet-stirred reactor at 1 atm. New experimental results were obtained over the high temperature range – K, and variable equivalence ratio (
This work has been devoted to a mass spectrometric investigation of the interaction of atmospheric oxygen or an air-methane mixture with molten V 2 O 5-NaPO 3, selected as a model catalyst; the work has been further aimed at studying the reaction data on the change in isotope composition 18 O/ 16 O have been analyzed, and the rate constants and order of reaction Author: S. V. Volkov, V. A. Bandur, N. I. Buryak. Carbon nanowalls (CNWs), vertically standing highly crystallizing graphene sheets, were used in the application of a surface-assisted laser desorption/ionization time-of-flight mass spectrometry (SALDI-TOF-MS). The CNW substrates solved the issues on interferences of matrix molecules and alkali metal addition ions in low-weight molecule by: 2.
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Peter Hart utilized the mass spectrometer to do isotopic studies of the carbon-oxygen reaction. He used O16 and 0'" oxygen molecules and followed the distribution of oxygen isotopes Cited by: 4. This option allows users to search by Publication, Volume and Page Selecting this option will search the current publication in context.
Selecting this option will search all publications across the Scitation platform Selecting this option will search all publications for the Publisher/Society in contextCited by: Utilizing the pressure‐independent reaction Y (g) +2C (s) →YC 2(g), second‐ and third‐law methods yielded D 0 0 =±6 kcal mole −1 and D 0 0 =±5 kcal mole −1, respectively, for the Y–C 2 bond energy.
An estimated heat of formation Cited by: Using mass-spectrometry at very low pressure by high vacuum techniques allows researchers to analyze very minute changes in (partial) pressures, specifically as the result of proceeding chemical reactions. Analyzing these small changes in pressure precisely allows the determination of reaction mechanisms and rates, and their energy by: The active surface area of the graphite was measured by the formation of surface oxide during low-pressure oxygen chemisorption onto the clean surface of the material.
By subsequent thermal desorption of surface oxide an additional value for the active surface area was obtained from the weight-loss data and the known ratios of the desorbed Author: J.
Graham Brown, John Dollimore, Clive M. Freedman, Brian H. Harrison. The mass spectrometric technique developed for the study of vaporization processes has been extended to the study of reactions of gases with condensed material at high temperatures.
The reaction of hydrogen with graphite has been studied with the purpose of determining the heat of formation of CH 2, the methylene free radical.
Development and validation of a finite-rate model for carbon oxidation by atomic oxygen. Carbon, DOI: / Pascal Düngen, Robert Schlögl, Saskia Heumann.
Non-linear thermogravimetric mass spectrometry of carbon materials providing direct speciation separation of oxygen functional groups. The use of partial-pressure mass spectrometry in the thermal analysis study of carbons and graphite The application of mass spectrometry to the study of carbon and graphite reactivity has provided a technique for studying the fundamental processes involved at the surface of a wide range of these materials.
for the Acheson's graphite and Cited by: Seventy-four mass spectrometric analyses have been made on eight isotopic standards for carbon and oxygen. The standards reported on are the National Bureau of Standards limestone, water, and graphite reference samples, the Solenhofen standard used by Niee for absolute measurements, and the carbonate standards used by the Stockholm, Basel, Wellington and Chicago by: The spontaneity of metal atom formation from metal oxides, both in the condensed phase, via thermal decomposition or reduction by carbon in a graphite furnace, depends on the instantaneous partial pressure of oxygen inside the furnace.
Since the partial pressure of the gaseous carbon species is very low, the reaction between carbon and oxygen is determined by heterogeneous, gas-solid by: 2. A mass spectrometer has been used to study the kinetics of the oxygen—tungsten reaction over the temperature range ° to °K at oxygen pressures as high as 2×10−4 Torr.
The main products of chemical reaction are identified as W3O9, W2O6, WO3, and WO2; their intensities are given as a function of surface temperature and oxygen by: Carbon corrosion: Thanks to on‐line differential electrochemical mass spectrometry, we show that oxygen‐containing carbon surface groups present on high‐surface area carbon, Vulcan XC72 or reinforced graphite are oxidized at PEMFC anode‐relevant potential.
These findings are rationalized by considering a Pt‐catalysed decarboxylation. The reaction between CO2 and C2H4 in the presence of H2 over Pt and PtSn-based (SiO2, Al2O3, MgO) supported catalysts has been studied at 34 bar of total pressure and K by in situ diffuse.
To realize the desired functionalization of carbon-based materials, controlled oxidation reactions are critical to a low density of lattice defects during carbon evolution. (7,8) With more than years of synthesis history, the fabrication of graphite oxide (GO) is the most typical oxidation reaction of carbon Author: Chang Li, Xi Chen, Liming Shen, Ningzhong Bao.
Gas chromatography-mass spectrometry analysis was used in this study to evaluate the 13 C enrichment and isotopomer composition. In earlier studies of hypoxic metabolism, positionally labeled [1- 13 C]Glc was used to specifically investigate energy metabolism and pH regulation in hypoxic maize (Zea mays) root tips (Roberts et al., Cited by: J.
Byrne's 11 research works with citations and reads, including: Vaporization and atomization of the platinum group elements in the graphite furnace investigated by electrothermal. Mass Spectrometric Study of Ion-Solvent Molecule Interactions in the Gas Phase P. KEBARLE Chapter 3, DOI: /bach Publication Date (Print): June 1, From analysis of the gas in the chamber by quadrupole mass spectrometry, the concentrations of the contaminants H 2 gas and water vapour were determined to Cited by: Graphite furnace mass spectrometry of aluminium.
International Journal of Mass Spectrometry and Ion Processes(), DOI: /(90) Wolfgang Frech, Douglas C. Baxter. A three-electrode differential electrochemical mass spectrometry (DEMS) cell has been developed to study the oxidative decomposition of electrolytes at high voltage cathode materials of Li-ion batteries.
In this DEMS cell, the working electrode used was the same as the cathode electrode in real Li-ion batteries, i.e., a lithium metal oxide deposited on a porous aluminum foil current by:. Inductively coupled plasma mass spectrometry (ICP-MS) is an analytical technique that can be used to measure elements at trace levels in biological fluids.
Although older techniques such as atomic absorption and atomic emission are still in use by some laboratories, there has been a slow shift toward ICP-MS, particularly in the last : Scott C Wilschefski, Matthew R Baxter. The solubility of carbon dioxide in a Ca-rich leucitite has been investigated as a function of pressure (– GPa), temperature (–°C), and oxygen fugacity.
The experiments were done in a rapid-quench internally-heated pressure vessel ( GPa) and a piston cylinder (– GPa). The leucitite glass, previously equilibrated at NNO, and silver oxalate were loaded in Fe-doped Cited by: The solubility of carbon dioxide in a Ca-rich leucitite has been investigated as a function of pressure (– GPa), temperature (–C), and oxygen fugacity.