The reactive chemisorption of carbon dioxide at magnesium and copper surfaces at low temperature

1988 ◽  
Vol 1 (1-3) ◽  
pp. 11-19 ◽  
Author(s):  
R. G. Copperthwaite ◽  
P. R. Davies ◽  
M. A. Morris ◽  
M. W. Roberts ◽  
R. A. Ryder
Keyword(s):  
Carbon Dioxide ◽  
Low Temperature ◽  
Copper Surfaces

scholarly journals Humidity Measurement in Carbon Dioxide with Capacitive Humidity Sensors at Low Temperature and Pressure

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2615 ◽  
Author(s):  
Andreas Lorek ◽  
Jacek Majewski
Keyword(s):  
Carbon Dioxide ◽  
Low Temperature ◽  
Sensor Calibration ◽  
Humidity Sensors ◽  
Near Surface ◽  
Adsorption Sites ◽  
Carbon Dioxide Gas ◽  
Individual Calibration ◽  
German Aerospace ◽  
Available Information

In experimental chambers for simulating the atmospheric near-surface conditions of Mars, or in situ measurements on Mars, the measurement of the humidity in carbon dioxide gas at low temperature and under low pressure is needed. For this purpose, polymer-based capacitive humidity sensors are used; however, these sensors are designed for measuring the humidity in the air on the Earth. The manufacturers provide only the generic calibration equation for standard environmental conditions in air, and temperature corrections of humidity signal. Because of the lack of freely available information regarding the behavior of the sensors in CO2, the range of reliable results is limited. For these reasons, capacitive humidity sensors (Sensirion SHT75) were tested at the German Aerospace Center (DLR) in its Martian Simulation Facility (MSF). The sensors were investigated in cells with a continuously humidified carbon dioxide flow, for temperatures between −70 °C and 10 °C, and pressures between 10 hPa and 1000 hPa. For 28 temperature–pressure combinations, the sensor calibration equations were calculated together with temperature–dependent formulas for the coefficients of the equations. The characteristic curves obtained from the tests in CO2 and in air were compared for selected temperature–pressure combinations. The results document a strong cross-sensitivity of the sensors to CO2 and, compared with air, a strong pressure sensitivity as well. The reason could be an interaction of the molecules of CO2 with the adsorption sites on the thin polymeric sensing layer. In these circumstances, an individual calibration for each pressure with respect to temperature is required. The performed experiments have shown that this kind of sensor can be a suitable, lightweight, and relatively inexpensive choice for applications in harsh environments such as on Mars.

Chemical Displacement of Molecules Adsorbed on Copper Surfaces:  Low-Temperature Studies with Applications to Surface Reactions

1997 ◽  
Vol 101 (40) ◽  
pp. 7908-7918 ◽  
Author(s):  
P. W. Kash ◽  
M. X. Yang ◽  
A. V. Teplyakov ◽  
G. W. Flynn ◽  
B. E. Bent
Keyword(s):  
Low Temperature ◽  
Surface Reactions ◽  
Copper Surfaces

scholarly journals Bi-functional heterogeneous catalysts for carbon dioxide conversion: enhanced performances at low temperature

RSC Advances ◽  
2018 ◽  
Vol 8 (45) ◽  
pp. 25342-25350 ◽  
Author(s):  
Adrien Comès ◽  
Xavier Collard ◽  
Luca Fusaro ◽  
Luciano Atzori ◽  
M. Giorgia Cutrufello ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Low Temperature ◽  
Reaction Temperature ◽  
Heterogeneous Catalysts ◽  
Cyclic Carbonates ◽  
Carbon Dioxide Conversion

Novel bi-functional catalysts allowing to decrease the reaction temperature for the synthesis of cyclic carbonates below 150 °C were successfully synthesized.

Biodiesel from transesterification at low temperature by AlCl3 catalysis in ethanol and carbon dioxide as cosolvent: Process, mechanism and application

2016 ◽  
Vol 164 ◽  
pp. 380-386 ◽  
Author(s):  
Qingqing Guan ◽  
Hua Shang ◽  
Jing Liu ◽  
Junjie Gu ◽  
Bin Li ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Low Temperature ◽  
Process Mechanism
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