Thermal desorption: Chemisorption of carbon monoxide on polycrystalline tungsten

1982 ◽  
Vol 47 (3) ◽  
pp. 884-890 ◽  
Author(s):  
Jan Hrbek ◽  
Jan Pavlíček
Keyword(s):  
Carbon Monoxide ◽  
Adsorption Isotherm ◽  
Thermal Desorption ◽  
Dissociative Adsorption ◽  
Experimental Results ◽  
Polycrystalline Tungsten

The adsorption isotherm was constructed from thermal desorption spectra of carbon monoxide on tungsten. Comparison of the experimental results with model isotherms supports a concept of the dissociative adsorption of carbon monoxide on tungsten.

scholarly journals The adsorption of argon, nitrogen and oxygen on smooth platinum foil at low temperatures and pressures.

1938 ◽  
Vol 164 (919) ◽  
pp. 510-531 ◽  
Author(s):  
F. J. Wilkins ◽  
Ralph Howard Fowler
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Adsorption Isotherm ◽  
Low Temperatures ◽  
Experimental Results ◽  
Adsorption Potential ◽  
Foil Surface ◽  
Irreversible Adsorption ◽  
Platinum Foil

The work to be described in this paper is, in effect, an extension of the earlier researches of Langmuir (1918), who measured the adsorption of argon, nitrogen, oxygen, carbon monoxide, carbon dioxide and methane on mica and glass at pressures up to 0∙1 mm. and temperatures of 90° and 155° K. He also investigated the adsorption of these gases on a smooth platinum foil surface, but except for a slow irreversible adsorption of oxygen at temperatures above 0° C., he was unable to detect any adsorption. In order to interpret his experimental results, Langmuir deduced his well-known adsorption isotherm: x = abp /(1 + ap ), where x is the amount adsorbed at a pressure p and temperature T . Of the constants b is equal to the saturation maximum; a is equal to a 0 eϕ/RT where a 0 is a constant and ϕ is the adsorption potential.

scholarly journals CO Oxidation Efficiency and Hysteresis Behavior over Mesoporous Pd/SiO2 Catalyst

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 131 ◽  
Author(s):  
Rola Mohammad Al Soubaihi ◽  
Khaled Mohammad Saoud ◽  
Myo Tay Zar Myint ◽  
Mats A. Göthelid ◽  
Joydeep Dutta
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Co Oxidation ◽  
Active Sites ◽  
Bond Activation ◽  
Dissociative Adsorption ◽  
High Catalytic Activity ◽  
Good Catalytic Activity ◽  
Pretreatment Conditions ◽  
Oxidation Efficiency

Carbon monoxide (CO) oxidation is considered an important reaction in heterogeneous industrial catalysis and has been extensively studied. Pd supported on SiO2 aerogel catalysts exhibit good catalytic activity toward this reaction owing to their CO bond activation capability and thermal stability. Pd/SiO2 catalysts were investigated using carbon monoxide (CO) oxidation as a model reaction. The catalyst becomes active, and the conversion increases after the temperature reaches the ignition temperature (Tig). A normal hysteresis in carbon monoxide (CO) oxidation has been observed, where the catalysts continue to exhibit high catalytic activity (CO conversion remains at 100%) during the extinction even at temperatures lower than Tig. The catalyst was characterized using BET, TEM, XPS, TGA-DSC, and FTIR. In this work, the influence of pretreatment conditions and stability of the active sites on the catalytic activity and hysteresis is presented. The CO oxidation on the Pd/SiO2 catalyst has been attributed to the dissociative adsorption of molecular oxygen and the activation of the C-O bond, followed by diffusion of adsorbates at Tig to form CO2. Whereas, the hysteresis has been explained by the enhanced stability of the active site caused by thermal effects, pretreatment conditions, Pd-SiO2 support interaction, and PdO formation and decomposition.

Theoretical Determination of Absorption With an Emphasis on High Temperatures and a Specific Application to Carbon Monoxide

1973 ◽  
Vol 95 (4) ◽  
pp. 535-538 ◽  
Author(s):  
J. C. Lin ◽  
R. Greif
Keyword(s):  
Carbon Monoxide ◽  
High Temperatures ◽  
Rotational Band ◽  
Experimental Results ◽  
Theoretical Determination ◽  
Hot Band ◽  
Good Agreement

The absorption of a vibrational-rotational band has been studied and the contribution from the first hot band has been included. A specific application has been made to carbon monoxide and good agreement with experimental results has been obtained.

Experimental Investigations of the Adsorption of NH3 on Silica Gel-Based Adsorbent

2005 ◽  
Author(s):  
Xiaolin Wang ◽  
Wolfgang Zimmermann ◽  
Kim Choon Ng ◽  
Lizhen Gao ◽  
Ju¨rgen U. Keller
Keyword(s):  
Adsorption Isotherm ◽  
Silica Gel ◽  
Working Condition ◽  
Experimental Results ◽  
Experimental Investigations ◽  
Promising Alternative ◽  
Weight Percentage ◽  
Heats Of Adsorption ◽  
Pure Silica ◽  
Gas Calorimeter

The silica gel-water working pair has been commonly used for commercial adsorption chillers due to the environmental benign refrigerant and low desorption temperature (less than 85°C). However, the application has been constrained due to the vacuum working condition and Ice point. This motivates researchers to investigate alternative working pairs. The silica gel-based adsorbents - ammonia working pairs have been found to be the most promising alternative. The isotherms and heats of adsorption of the working pair are essential to be investigated for designing the adsorption reactor and predicting the chiller performance. A novel sensor-gas calorimeter has been used to simultaneously measure the adsorption isotherm and heats of adsorption. The experimental results for adsorption of ammonia on the pure silica gel and silica gel treated with different weight percentage of calcium chlorine are presented.

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