THE OXIDATION OF METHANE AT HIGH PRESSURES: II. EXPERIMENTS WITH VARIOUS MIXTURES OF VIKING NATURAL GAS AND AIR

1937 ◽  
Vol 15b (10) ◽  
pp. 401-413 ◽  
Author(s):  
E. H. Boomer ◽  
Victor Thomas
Keyword(s):  
Natural Gas ◽  
Pressure Range ◽  
High Pressures ◽  
Space Velocity ◽  
Principal Product ◽  
Temperature Range ◽  
Oxidation Of Methane ◽  
Mixture Pressure

Mixtures of a natural gas, substantially methane, and air in various proportions were passed over catalysts, and the effects of the variables, composition of mixture, pressure, temperature, and space velocity, were determined. Similar experiments were made with mixtures of methane and air. Mixtures containing from less than 3% to more than 13% of oxygen as air were used. The temperature range was 350° to 500 °C. and the pressure range 140 to 230 atm. Methanol was the principal product, and yields as high as 74% on the basis of carbon oxidized were obtained. Copper was the principal catalyst used. Traces of sulphur poisoned the catalyst very effectively.

THE OXIDATION OF METHANE AT HIGH PRESSURES: III. EXPERIMENTS USING PURE METHANE AND PRINCIPALLY COPPER AS CATALYST

1937 ◽  
Vol 15b (10) ◽  
pp. 414-433 ◽  
Author(s):  
E. H. Boomer ◽  
V. Thomas
Keyword(s):  
Carbon Dioxide ◽  
High Pressures ◽  
Oxidation Of Methane ◽  
Silver Catalysts ◽  
Mixture Pressure ◽  
Pure Methane

Mixtures of methane containing some nitrogen and oxygen were passed over copper and silver catalysts. The effects of the variables, composition of mixture pressure, and temperature were determined. From 3 to 7% of oxygen was used in various experiments at pressures from 140 to 220 atm. at a temperature of 475 °C. The effect on yields of additions of carbon dioxide to the mixture was determined.

scholarly journals A Critical Evaluation of Natural Gas-water Formula Correlations

2020 ◽  
pp. 1-20
Author(s):  
V. J. Aimikhe ◽  
M. A. Adeyemi
Keyword(s):  
Natural Gas ◽  
Water Content ◽  
Correction Factor ◽  
High Pressures ◽  
Critical Evaluation ◽  
Correction Factors ◽  
Acid Gas ◽  
Temperature Range ◽  
Tuneable Diode Laser ◽  
Low Pressures

The performance evaluation of fourteen (14) formula correlations for predicting the water content of natural gas in equilibrium with water, and the suitability of some of these correlations in predicting the water content of natural gas in equilibrium with hydrates, has been presented. Also presented was an evaluation of acid gas and gravity correction factor correlations. The evaluation was achieved by using the cubic plus association equation of state - CPA EoS, published experimental water content data from a tuneable diode laser adsorption spectrometer, and data from the gas processors supplier’s association (GPSA) chart, to validate the results of the correlations. The results of the validation showed that for the prediction of the water content of natural gas in equilibrium with water, the Bukacek correlation was best suited for low pressures of 1 and 2.5 MPa at a temperature range of 9 to 58°C. The modified ideal model (MIM) correlation was the best for pressures of 5 and 10 MPa, at temperature range of 30 to 89.6°C The Aimikhe correlation was best suited for pressures of 7.5 MPa, at a temperature range of 30 to 86°C, while the Khaled’s correlation performed better for high pressures of 25 and 50 MPa, at a temperature range of 30 to 91.5°C. The Maddox correction factor had better accuracy than other acid gas correction factors when accounting for the presence of acid gases. The Mohammadi or Chapoy gravity correction factors were the best correlations for accounting for the presence of heavy components in natural gas. For processed methane-rich natural gas in equilibrium with hydrates at a temperature range of -20 to 10°C, the Lin correlation was best suited for pressures of 2.5 and 5 MPa while the MIM correlation performed better at pressures of 7.5, 15 and 20 MPa.

Dynamic Viscosity of Compressed Water to 10 Kilobar and Steam to 1500°C

1969 ◽  
Vol 11 (2) ◽  
pp. 189-205 ◽  
Author(s):  
E. A. Bruges ◽  
M. R. Gibson
Keyword(s):  
Gaseous Phase ◽  
Dynamic Viscosity ◽  
Low Temperatures ◽  
Pressure Range ◽  
Low Pressure ◽  
Temperature Range ◽  
Inversion Temperature ◽  
Pressure Steam ◽  
Correlating Equations ◽  
First Time

Equations specifying the dynamic viscosity of compressed water and steam are presented. In the temperature range 0-100cC the location of the inversion locus (mu) is defined for the first time with some precision. The low pressure steam results are re-correlated and a higher inversion temperature is indicated than that previously accepted. From 100 to 600°C values of viscosity are derived up to 3·5 kilobar and between 600 and 1500°C up to 1 kilobar. All the original observations in the gaseous phase have been corrected to a consistent set of densities and deviation plots for all the new correlations are given. Although the equations give values within the tolerances of the International Skeleton Table it is clear that the range and tolerances of the latter could with some advantage be revised to give twice the existing temperature range and over 10 times the existing pressure range at low temperatures. A list of the observations used and their deviations from the correlating equations is available as a separate publication.

scholarly journals Investigation of Co–Fe–Al Catalysts for High-Calorific Synthetic Natural Gas Production: Pilot-Scale Synthesis of Catalysts

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 105
Author(s):  
Tae Young Kim ◽  
Seong Bin Jo ◽  
Jin Hyeok Woo ◽  
Jong Heon Lee ◽  
Ragupathy Dhanusuraman ◽  
...  
Keyword(s):  
Natural Gas ◽  
Spinel Phase ◽  
Space Velocity ◽  
Pilot Scale ◽  
Gas Production ◽  
Laboratory Scale ◽  
Optimum Conditions ◽  
Synthetic Natural Gas ◽  
Co Conversion ◽  
Ft Ir

Co–Fe–Al catalysts prepared using coprecipitation at laboratory scale were investigated and extended to pilot scale for high-calorific synthetic natural gas. The Co–Fe–Al catalysts with different metal loadings were analyzed using BET, XRD, H2-TPR, and FT-IR. An increase in the metal loading of the Co–Fe–Al catalysts showed low spinel phase ratio, leading to an improvement in reducibility. Among the catalysts, 40CFAl catalyst prepared at laboratory scale afforded the highest C2–C4 hydrocarbon time yield, and this catalyst was successfully reproduced at the pilot scale. The pelletized catalyst prepared at pilot scale showed high CO conversion (87.6%), high light hydrocarbon selectivity (CH4 59.3% and C2–C4 18.8%), and low byproduct amounts (C5+: 4.1% and CO2: 17.8%) under optimum conditions (space velocity: 4000 mL/g/h, 350 °C, and 20 bar).

scholarly journals Catalytic Oxidation of Methane

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 944
Author(s):  
Anil C. Banerjee
Keyword(s):  
Power Generation ◽  
Natural Gas ◽  
Catalytic Oxidation ◽  
Energy Sources ◽  
Oxidation Of Methane

Methane (the major component of natural gas) is one of the main energy sources for gas-powered turbines for power generation, and transport vehicles [...]

Effect of Fe and Co promoters on CO methanation activity of nickel catalyst prepared by impregnation – co-precipitation method

2020 ◽  
Vol 18 (5-6) ◽  
Author(s):  
Buyan-Ulzii Battulga ◽  
Tungalagtamir Bold ◽  
Enkhsaruul Byambajav
Keyword(s):  
Synergetic Effect ◽  
Space Velocity ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Alumina Support ◽  
Co Methanation ◽  
Temperature Range ◽  
Co Precipitation ◽  
Catalyst Distribution

AbstractNi based catalysts supported on γ-Al2O3 that was unpromoted (Ni/γAl2O3) or promoted (Ni–Fe/γAl2O3, Ni–Co/γAl2O3, and Ni–Fe–Co/γAl2O3) were prepared using by the impregnation – co-precipitation method. Their catalytic performances for CO methanation were studied at 3 atm with a weight hourly space velocity (WHSV) of 3000 ml/g/h of syngas with a molar ratio of H2/CO = 3 and in the temperature range between 130 and 350 °C. All promoters could improve nickel distribution, and decreased its particle sizes. It was found that the Ni–Co/γAl2O3 catalyst showed the highest catalytic performance for CO methanation in a low temperature range (<250 °C). The temperatures for the 20% CO conversion over Ni–Co/γAl2O3, Ni–Fe/γAl2O3, Ni–Fe–Co/γAl2O3 and Ni/γAl2O3 catalysts were 205, 253, 263 and 270 °C, respectively. The improved catalyst distribution by the addition of cobalt promoter caused the formation of β type nickel species which had an appropriate interacting strength with alumina support in the Ni–Co/γAl2O3. Though an addition of iron promoter improved catalyst distribution, the methane selectivity was lowered due to acceleration of both CO methanation and WGS reaction with the Ni–Fe/γAl2O3. Moreover, it was found that there was no synergetic effect from the binary Fe–Co promotors in the Ni–Fe–Co/γAl2O3 on catalytic activity for CO methanation.

A Ce-Zr-Ti Oxide Catalyst for Selective Catalytic Reduction of NO with Ammonia

2014 ◽  
Vol 535 ◽  
pp. 709-712
Author(s):  
Ye Jiang ◽  
Yan Yan ◽  
Shan Bo Huang ◽  
Xiong Zhang ◽  
Xin Wei Wang ◽  
...  
Keyword(s):  
High Activity ◽  
Selective Catalytic Reduction ◽  
Oxide Catalyst ◽  
Catalytic Reduction ◽  
Space Velocity ◽  
Impregnation Method ◽  
Reduction Of No ◽  
No Conversion ◽  
Temperature Range ◽  
Ti Oxides

A Ce-Zr-Ti oxide catalyst was prepared by an impregnation method and tested for the selective catalytic reduction of NO with NH3. The Ce-Zr-Ti oxide catalyst exhibited high activity and more than 95% NO conversion was obtained within the temperature range 300-500 °C at the high gas hourly space velocity of 50,000 h-1. The addition of Zr improved the activity of Ce-Ti oxides especially at higher reaction temperatures and their resistance to SO2.

Responses of cerebral arteries and arterioles to acute hypotension and hypertension

1978 ◽  
Vol 234 (4) ◽  
pp. H371-H383 ◽  
Author(s):  
H. A. Kontos ◽  
E. P. Wei ◽  
R. M. Navari ◽  
J. E. Levasseur ◽  
W. I. Rosenblum ◽  
...  
Keyword(s):  
Pressure Range ◽  
High Pressures ◽  
Cerebral Arteries ◽  
Pial Arteries ◽  
Small Vessels ◽  
Size Dependent ◽  
Arterial Blood ◽  
Vascular Bed ◽  
Acute Hypotension ◽  
Very High

The responses of cerebral precapillary vessels to changes in arterial blood pressure were studied in anesthetized cats equipped with cranial windows for the direct observation of the pial microcirculation of the parietal cortex. Vessel responses were found to be size dependent. Between mean arterial pressures of 110 and 160 mmHg autoregulatory adjustments in caliber, e.g., constriction when the pressure rose and dilation when the pressure decreased, occurred only in vessels larger than 200 micron in diameter. Small arterioles, less than 100 micron in diameter, dilated only at pressures equal to or less than 90 mmHg; below 70 mmHg their dilation exceeded that of the larger vessels. When pressure rose to 170- 200 mmHg, small vessels dilated while the larger vessels remained constricted. At very high pressures (greater than 200 mmHg) forced dilation was frequently irreversible and was accompanied by loss of responsiveness to hypocapnia. Measurement of the pressure differences across various segments of the cerebral vascular bed showed that the larger surface cerebral vessels, extending from the circle of Willis to pial arteries 200 micron in diameter, were primarily responsible for the adjustments in flow over most of the pressure range.

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