THE PREPARATION AND SINTERING OF FINELY DIVIDED SODIUM CHLORIDE. II

1957 ◽  
Vol 35 (12) ◽  
pp. 1511-1521 ◽  
Author(s):  
J. B. Moffat ◽  
R. McIntosh
Keyword(s):  
Carbon Dioxide ◽  
Water Vapor ◽  
Sodium Chloride ◽  
Specific Surface ◽  
Physical Adsorption ◽  
Ion Pairs ◽  
Adsorbed Water ◽  
Qualitative Theory ◽  
Relative Pressure ◽  
Fractional Change

The sintering of unpacked samples of sodium chloride of high specific surface has been investigated. The sintering occurred in the presence of known pressures of water vapor and at temperatures below 70 °C. The progress of the change of specific surface was followed by measuring the physical adsorption of carbon dioxide at approximately −80 °C. It has been shown that an unchanging value of the surface area of a given sample exists at each relative pressure of water vapor. The area attained is independent of the number of exposures to water vapor at pressures below the final pressure. The fractional change of area of all samples in the range 35 to 80 m•2/g. depends only upon the relative pressure of water vapor. Preliminary observations of the behavior of loaded samples showed that packing the samples does not affect the character of the sintering.A qualitative theory to account for these findings is given. It is postulated that certain ion pairs become mobile when the binding energy to the crystal is reduced by the adsorbed water. On increasing the amount of adsorbed water additional ion pairs become free to migrate and the process resulting in loss of specific surface continues to a further extent.

scholarly journals An Experimental and Kinetic Study of the Sorption of Carbon Dioxide onto Amine-Treated Oil Fly Ash

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Mohammed A. Saad ◽  
Mohammed J. Al-Marri ◽  
Ali L. Yaumi ◽  
Ibnelwaleed A. Hussein ◽  
Reyad Shawabkeh
Keyword(s):  
Carbon Dioxide ◽  
Fly Ash ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Physical Adsorption ◽  
Ammonium Hydroxide ◽  
Relative Pressure ◽  
Monolayer Adsorption ◽  
Adsorption Of Co ◽  
Oil Fly Ash

A new CO2adsorbent is produced from waste oil fly ash (OFA). Ammonium hydroxide solution is used to convert OFA to activated carbon. Then, the product is used for the adsorption of CO2from a nitrogen/carbon dioxide (N2/CO2) gas mixture. The OFA samples are characterized by several techniques. Chemical treatment of OFA considerably changed its surface morphology. In particular, its surface area, as determined by BET measurements, increased from 59 to 318 m2/g. The amine-functionalized ash had a monolayer adsorption capacity of 74.51 mg/g and was obtained at relative pressure,0.05<p/ps<0.35. A kinetics study showed that the CO2adsorption capacity of OFA increased with increasing CO2flow rates and concentrations and decreasing the relative humidity. Unlike physical adsorption, the chemisorption process resulted in increased adsorption capacity with increasing temperatures over the range 0–40°C. We also found that the adsorption process was endothermic (80–173 kJ/mol). The isotherm data for the adsorption process were fitted using different models. The saturation capacity determined from the Sips model, which corresponds to the sum of the saturation capacities of all of the adsorbed layers, was 540.3 mg/g of ash.

Inhibition of Carbon Dioxide Hydrates by Ethanol and Sodium Chloride

2017 ◽  
Author(s):  
Amanda Guembaroski ◽  
Moisés Marcelino Neto ◽  
Rigoberto Morales ◽  
Amadeu Sum
Keyword(s):  
Carbon Dioxide ◽  
Sodium Chloride

scholarly journals Experimental Study on Activated Carbon-MIL-101(Cr) Composites for Ethanol Vapor Adsorption

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3811
Author(s):  
Zhongbao Liu ◽  
Jiayang Gao ◽  
Xin Qi ◽  
Zhi Zhao ◽  
Han Sun
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Ethanol Vapor ◽  
Future Application ◽  
Working Fluid ◽  
Relative Pressure ◽  
Adsorption Refrigeration ◽  
Vapor Adsorption

In this study, the hydrothermal method was used to synthesize MIL-101(Cr), and activated carbon (AC) with different content was incorporated in to MIL-101(Cr), thereby obtaining AC-MIL-101(Cr) composite material with a huge specific surface area. The physical properties of MIL-101(Cr) and AC-MIL-101(Cr) were characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), nitrogen adsorption and desorption and specific surface area testing, and ethanol vapor adsorption performance testing. The results show that with the increase of activated carbon content, the thermal stability of AC-MIL-101(Cr) is improved. Compared with the pure sample, the BET specific surface area and pore volume of AC-MIL-101(Cr) have increased; In the relative pressure range of 0–0.4, the saturated adsorption capacity of AC-MIL-101(Cr) to ethanol vapor decreases slightly. It is lower than MIL-101(Cr), but its adsorption rate is improved. Therefore, AC-MIL-101(Cr)/ethanol vapor has a good application prospect in adsorption refrigeration systems. The exploration of AC-MIL-101(Cr) composite materials in this paper provides a reference for the future application of carbon-based/MOFS composite adsorbent/ethanol vapor working fluid in adsorption refrigeration.

Carbon Capture Performance of Amino-Modified MIL-101 at Room Temperature

2013 ◽  
Vol 395-396 ◽  
pp. 637-640
Author(s):  
Yi Yang ◽  
Zheng Ping Wang ◽  
Ling Meng ◽  
Lian Jun Wang
Keyword(s):  
Carbon Dioxide ◽  
Specific Surface ◽  
Pore Structure ◽  
Carbon Capture ◽  
Room Temperature ◽  
Ambient Pressure ◽  
Metal Organic Framework ◽  
Adsorption Properties ◽  
Carbon Dioxide Adsorption ◽  
Before And After

MIL-101, a metal-organic framework material, was synthesized by the high-temperature hydrothermal method. Triethylenetetramine (TETA) modification enabled the effective grafting of an amino group onto the surface of the materials and their pore structure. The crystal structure, micromorphology, specific surface area, and pore structure of the samples before and after modification were analyzed with an X-ray diffractometer, scanning electron microscope, specific surface and aperture tester, and infrared spectrometer. The carbon dioxide adsorption properties of the samples were determined by a thermal analyzer before and after TETA modification. Results show that moderate amino modification can effectively improve the microporous structure of MIL-101 and its carbon dioxide adsorption properties. After modification, the capacity of MIL-101 to adsorb carbon dioxide decreased only by 0.61 wt%, and a high adsorption capacity of 9.45 wt% was maintained after six cycles of adsorption testing at room temperature and ambient pressure.

Carbon dioxide and water vapor fluxes of multi-purpose winter wheat production systems in the U.S. Southern Great Plains

2021 ◽  
Vol 310 ◽  
pp. 108631
Author(s):  
Pradeep Wagle ◽  
Prasanna H. Gowda ◽  
Brian K. Northup ◽  
James P.S. Neel ◽  
Patrick J. Starks ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Water Vapor ◽  
Winter Wheat ◽  
Great Plains ◽  
Production Systems ◽  
Wheat Production ◽  
Southern Great Plains ◽  
The U.S
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