Showing papers in "Carbon in 1970"

TL;DR: In this paper, the oxides of a number of transition metals have been studied as catalysts for the oxidation of graphite by dry oxygen, and the localized action of the catalyst particles gave rise to catalytic channeling and/or the promotion of etch pit formation on the graphite basal plane.

TL;DR: In this paper, the Langmuir adsorption isotherm and is a function of pH only; the saturation value is constant up to 170° and the equilibrium constants and heats of protonation are estimated.

TL;DR: In this paper, the pyrolysis of polyfurfuryl alcohol and phenolic polymers leading to glass-like carbon is studied in detail, and the effect of cross-linking of the polymers is shown by the modification with formaldehyde as well as by comparison with oxidized polyphenylene oxide.

TL;DR: In this article, the rate of oxidation of coconut charcoal, electrode graphite and metallurgical coke granules in CO 2-CO and CO2-CO-He gas mixtures at various pressures was measured within the range of 700°-1400°C.

TL;DR: The role of copper as a catalyst in the oxidation of graphite has been studied by optical microscopy and thermogravimetric analysis as mentioned in this paper, which suggests that the catalytic effect involves the localized reduction of cupric oxide by graphite and subsequent reoxidation of the resulting metal.

TL;DR: In this paper, the structure of carbon deposited on metal substrates has been studied by thermally decomposing methane over iron, cobalt and nickel surfaces, and electron and X-ray diffraction properties of the former afforded evidence for its perfectly crystalline graphite nature.

TL;DR: In this paper, the reaction of Graphon with O2 has been studied at temperatures between 525° and 675°C, using initial O2 pressures between 10 and 200 mTorr and a sample varying in burnoff between zero and 28 per cent.

TL;DR: In this paper, the formation rate of carbon fibers during the thermal decomposition of acetylene in mixtures with nitrogen and hydrogen at temperatures from 450 to 700°C on metal wire surface was investigated.

TL;DR: In this article, the pore characteristics of carbons, e.g., graphites, coke, and charcoals, have been investigated by utilizing X-ray and microscopic techniques and by measuring pore volume, pore surface area, and corresponding effective diffusivities of CO-CO 2 and H 2 -H 2 O.

TL;DR: In this paper, the effect of substitution with boron at six concentrations between 6 × 10−6 and 10−2 B C atom ratios has been studied as a function of temperature (550 −650°C), carbon burn-off, O2 pressure and pre-treatment in water at 625°C.

TL;DR: In this paper, the thermal decomposition of surface oxides formed during low pressure oxidation of Graphon was studied, and it was suggested that the surface oxide leaves highly reactive sites on the Graphon surface at which CO 2 can react.

TL;DR: In this paper, the authors reviewed the facts and theories which are generally accepted, particular attention being paid both to the phenomenological aspects of surface oxide formation and decomposition, and to the occurrence of maxima in Arrhenius plots at elevated temperatures.

TL;DR: In this paper, the formation of basic surface oxides is investigated, and it is shown that each basic group contains two differently bound O atoms, one being volatilized as CO and CO2 on heating to 900°, the other one at 1200°.

TL;DR: In this article, the results of measurements of thermal conductivity, electric resistivity and heat capacity of graphites with density of 1·9 g/cm3 and higher in the temperature range 50-2500°K are presented.

TL;DR: In this paper, a new theory of the principal thermal expansion coefficients of a graphite crystal was derived using the lattice dynamics obtained by Komatsu, and the theory was compared with new data on the low temperature thermal expansion coefficient of very highly oriented pyrolytic graphite and high temperature X-ray data.

TL;DR: Carbon fibres have been prepared by the controlled thermal decomposition of fibres of vinylidene chloride/vinyl chloride copolymer (Saran), and changes in structure and morphology occurring during carbon formation and subsequent heat treatment to about 2500°C have been followed by X-ray diffraction, and by optical and electron microscopy, and have been related to the chemistry of decomposition as discussed by the authors.

TL;DR: An electron microscope and electron diffraction study has been made of the oxidation of graphites with a mixture of concentrated sulphuric and nitric adds at room temperature for periods ranging from 5 min to 25 weeks.

TL;DR: In this paper, a plot of cumulative recovery of CO + CO2 against temperature shows distinct linear regions, the amount recovered in each linear region showing close agreement with the amount of oxygen previously chemisorbed at different site configurations on the Graphon surface.

TL;DR: The results of the study of the porous structure of active carbons by independent methods have shown differences in the shapes of the pores of active carbon, prepared by different methods of activation as mentioned in this paper.

TL;DR: In this paper, the magnetoresistance and its field dependence (down to 20G) were investigated at temperatures of 1.6, 4.2, 77 and 300°K for soft carbons heattreated in the range 1000-3200°C.

TL;DR: A method of preparing stage 1 graphite ferric chloride with 97 per cent of the theoretical composition of C61FeCl3 is described in this article, where the solvent action of acetone on the product has been shown to completely empty a certain fraction of the spaces.

TL;DR: In this article, the effects of particle size, temperature and pressure on the rate of oxidation of graphite and coke in CO 2 -CO mixtures derived from the mathematical analysis are found to be in reasonable accord with present and previous experimental observations.

TL;DR: In this article, the A-A stacking fault energy of a graphite crystal using the Lennard-Jones potentials between atoms in different layer planes is calculated using a linear regression model.

TL;DR: In this paper, X-ray crystallographic measurements were obtained on the graphitized carbons and showed them to be of two classes based on ring structure of the starting materials, regardless of whether the starting material contained none, one, or two nitrogen atoms.

TL;DR: In this paper, a preliminary investigation has been made into the behavior of the surface oxygen complex during its formation and thermal desorption from the cleaned surface of a non-graphitic carbon (a rapidly pyrolised 720°C polyvinylidene chloride carbon).

TL;DR: Based on the well-known interpretations of the catalytic influence of alkalis on the carbon gasification reactions, a new theoretical approach has been evolved as discussed by the authors, derived from the increased mobility of the valency electrons from the alkali cores, which are introduced into the carbon lattice.

TL;DR: In this article, it was shown that a substitutional solid solution of silicon in pyrocarbon is formed, the maximum solid solubility being 0.15-0.20 per cent.

TL;DR: In this paper, a series of extruded, resin-bonded graphites with a boron content range from 0 to 0.79 weight per cent was considered and the results showed that up to at least 0.16 per cent the solubility appears to be substitutional.

TL;DR: The success of the Dubinin equation has been attributed to a unique distribution of shapes and dimensions within the microporosity such as to create a distribution of adsorption potential within a micropore volume which resembles a Rayleigh-type distribution as mentioned in this paper.

TL;DR: In this paper, a comparison of gasometric and thermogravimetric studies on the variations of the reactivity of a lignite char (H.T. 550°C) gasified at temperatures from 300 to 400°C at various partial pressures of oxygen (total pressure of mixture of nitrogen and oxygen = ρN2 + ρO2 = 1 atm).