A Cd mixed-ligand MOF showing ligand-disorder induced breathing behaviour at high temperature and stepwise, selective carbon dioxide adsorption at low temperature

CrystEngComm ◽  
2017 ◽  
Vol 19 (26) ◽  
pp. 3607-3618 ◽  
Author(s):  
Tayyibah Tahier ◽  
Clive L. Oliver
Keyword(s):  
Carbon Dioxide ◽  
High Temperature ◽  
Low Temperature ◽  
Mixed Ligand ◽  
Carbon Dioxide Adsorption

scholarly journals Carbon Dioxide Adsorption in Amine-Functionalized Mixed-Ligand Metal-Organic Frameworks of UiO-66 Topology

ChemSusChem ◽  
2014 ◽  
Vol 7 (12) ◽  
pp. 3382-3388 ◽  
Author(s):  
Jayashree Ethiraj ◽  
Elisa Albanese ◽  
Bartolomeo Civalleri ◽  
Jenny G. Vitillo ◽  
Francesca Bonino ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Metal Organic Frameworks ◽  
Mixed Ligand ◽  
Carbon Dioxide Adsorption ◽  
Amine Functionalized ◽  
Metal Organic

scholarly journals The Formation of the Oxides of Carbon by the Pyrolysis of Tobacco

1975 ◽  
Vol 8 (1) ◽  
Author(s):  
R. R. Baker
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
High Temperature ◽  
Low Temperature ◽  
Heating Rate ◽  
Temperature Region ◽  
High Temperature Region ◽  
Heating Rates ◽  
Carbon Oxides ◽  
Decomposition Reactions

AbstractFlue-cured Virginia tobacco has been heated in nitrogen and nitrogen/oxygen mixtures under flow conditions, and the rate of formation of carbon monoxide and carbon dioxide has been determined as a function of temperature, heating rate, and proportion of oxygen in the gas. When the tobacco is heated in nitrogen at heating rates comparable to those in a smouldering cigarette, 27 % of the carbon content of the tobacco is converted to carbon oxides. Both carbon oxides show two distinct formation regions: a low-temperature region (about 100°-450°C), and a high-temperature region (about 550°-900°C). These temperature limits are almost identical to those predicted from studies on the combustion coal of a cigarette burning in air. When tobacco, or the carbonaceous residue remaining after the pyrolysis experiments, is heated in nitrogen / oxygen mixtures, the total amount of carbon converted to carbon monoxide and carbon dioxide is independent of heating rate, but the relative proportions of the two oxides are strongly dependent on heating rate. At the lower heating rate, proportionally less carbon monoxide, and more carbon dioxide, is produced. Under oxidation conditions, about 70 % of both carbon oxides formed in the low-temperature region (100°-450°C) are produced by tobacco decomposition reactions, whereas in the high-temperature region about 10-20 % of the carbon monoxide, and 2-9 % of the carbon dioxide, are produced by tobacco decomposition.

Selective carbon dioxide adsorption by mixed-ligand porous coordination polymers

CrystEngComm ◽  
2015 ◽  
Vol 17 (44) ◽  
pp. 8388-8413 ◽  
Author(s):  
Biswajit Bhattacharya ◽  
Debajyoti Ghoshal
Keyword(s):  
Carbon Dioxide ◽  
Solid State ◽  
Coordination Polymers ◽  
Metal Organic Frameworks ◽  
Mixed Ligand ◽  
Carbon Dioxide Adsorption ◽  
Porous Coordination Polymers ◽  
Metal Organic ◽  
Proper Design

Mixed ligand metal–organic frameworks (MOFs) have resolutely established themselves as a class of excellent solid state sorbents for carbon dioxide (CO2) and a proper design of such MOF can potentially improve not only the amount of CO2 adsorption, but also the selectivity of CO2 uptake over other gases and volatiles.

ENVIRONMENTAL RELATIONSHIPS IN A SEED-BORNE DISEASE OF BARLEY CAUSED BY HELMINTHOSPORIUM SATIVUM PAMMEL, KING, AND BAKKE

1942 ◽  
Vol 20c (11) ◽  
pp. 525-538 ◽  
Author(s):  
H. W. Mead
Keyword(s):  
Carbon Dioxide ◽  
High Temperature ◽  
Low Temperature ◽  
Oxygen Content ◽  
Nutrient Solution ◽  
Dry Weight ◽  
Moist Soil ◽  
Environmental Relationships ◽  
Helminthosporium Sativum ◽  
Seedling Infection

The experiments described in this article show that the greatest seedling injury occurs under conditions that are unfavourable to the host, i.e., high temperature and excessive moisture or low temperature and scant moisture; that the greatest recovery takes place at 15 to 18 °C. in moist soil. They further show that packing and fertilization of the soil increase the amount of infection, though fertilization may increase the dry weight of the seedlings; that the microflora of the soil has little influence upon the seed-borne parasite; that reduction of the oxygen content of a nutrient solution and of soil from 21% to 10% depresses the growth of the seedlings and the amount of infection; that the addition of 1% of carbon dioxide to the atmosphere of soil increases the amount of seedling infection. From these results the conclusion is drawn that barley that is infected with H. sativum should be sown in cool, moist, well aerated soil.

PERFORMANCE EVALUATION OF CASCADE REFRIGERATION SYSTEMS USING DIFFERENT REFRIGERANTS

2012 ◽  
Vol 20 (03) ◽  
pp. 1250010 ◽  
Author(s):  
ANTONIO MESSINEO ◽  
DOMENICO PANNO
Keyword(s):  
Carbon Dioxide ◽  
High Temperature ◽  
Low Temperature ◽  
Operating Parameters ◽  
Refrigeration System ◽  
Alternative Refrigerants ◽  
Negative Effects ◽  
Cascade Refrigeration System ◽  
Cascade Refrigeration ◽  
Interesting Alternative

Due to the negative effects of synthetic refrigerants on the environment, natural refrigerants have obtained again interest as alternative refrigerants for different applications because of their zero ODP and negligible GWP. This paper presents a thermodynamic analysis of different two-stage cascade refrigeration systems using as refrigerant carbon dioxide (R744) in low-temperature circuit, and, respectively, ammonia (R717), propane (R290), butane (R600), R404A, R410A and R134a in high-temperature circuit. The operating parameters considered in this study include condensing and evaporating temperatures in high-temperature circuit, temperature difference in the cascade heat exchanger, and evaporating and condensing temperatures in the low-temperature circuit. The results obtained show that a cascade refrigeration system using natural refrigerants is an interesting alternative to systems using synthetic refrigerants for energetic, security and environmental reasons.

The specific heat of carbon dioxide and the form of the CO2 molecule

1927 ◽  
Vol 23 (8) ◽  
pp. 890-900 ◽  
Author(s):  
W. H. McCrea
Keyword(s):  
Carbon Dioxide ◽  
Fine Structure ◽  
High Temperature ◽  
Low Temperature ◽  
Specific Heat ◽  
Low Temperatures ◽  
Molecular Model ◽  
Band Spectrum ◽  
Spectrum Data

SummaryTwo alternative forms of the CO2 molecule have been suggested by various authors who have discussed the band spectrum data. The specific heat curves based on these models are considered here. It is found that neither is quite satisfactory over the whole range of temperature and we discuss the difficulties for the low temperature and high temperature portions separately. In order to get agreement for low temperatures we find it necessary to introduce a further hypothesis about the molecular model which also seems to explain one or two outstanding difficulties in interpreting the fine structure of the bands. This assumption does not make any difference at higher temperatures where we show the error in one of the curves to be of the order we should expect to be accounted for by a centrifugal stretching of the molecule.

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