FTIR spectroscopic study of carbon dioxide adsorption/desorption on magnesia/calcium oxide catalysts

1992 ◽  
Vol 96 (22) ◽  
pp. 9035-9038 ◽  
Author(s):  
Rosemarie Philipp ◽  
Kaoru Fujimoto
Keyword(s):  
Carbon Dioxide ◽  
Spectroscopic Study ◽  
Calcium Oxide ◽  
Oxide Catalysts ◽  
Carbon Dioxide Adsorption ◽  
Adsorption Desorption

scholarly journals STUDY OF CARBON DIOXIDE ADSORPTION ON CHROMOXIDE CATALYST ON NON-STATIONARY CONCENTRATIONS

2018 ◽  
Vol 61 (7) ◽  
pp. 37 ◽  
Author(s):  
Nikolay I. Kol'tsov ◽  
Vladislav Kh. Fedotov
Keyword(s):  
Experimental Data ◽  
Carbon Dioxide ◽  
Chemical Kinetics ◽  
Carbon Dioxide Adsorption ◽  
Dissociative Mechanism ◽  
Simple Method ◽  
Desorption Process ◽  
Adsorption And Desorption ◽  
Additional Information ◽  
Adsorption Desorption

Investigation of the regularities of chemical processes, not only near but also far from the stationary state, gives additional information on their mechanisms. In this paper, we present a new method for estimating rate constants of adsorption-desorption processes from the experimentally measured values of the nonstationary concentrations of an adsorbed substance, based on calculating the instantaneous rates of the adsorption (or desorption) process. This method allows to connect unknown kinetic parameters of adsorption (desorption) of a substance on the catalyst surface for various most probable assumed mechanisms with the calculated values of the instantaneous rates of adsorption-desorption processes. As a consequence, the method makes it possible to solve two types of inverse problems of chemical kinetics: calculate point and interval values of rates constants of adsorption and desorption; determine the most likely mechanism from several proposed mechanisms of implementation of these processes. Using this method, point and interval values of the rates constants of adsorption and desorption of carbon dioxide were determined on the base of nonstationary experimental data on adsorption on the assumption of carbon dioxide adsorption on a chromoxide catalyst to three proposed mechanisms: linear, bimolecular and dissociative. Based on the results of calculations, the corresponding non-stationary dependences of carbon dioxide adsorption were restored, which were compared with the experimental data. The obtained results confirm that the previously established dissociative mechanism of adsorption of carbon dioxide on the chromoside catalyst is the most probable. The developed simple method does not require the use of complex optimization calculations and can be used to solve the inverse problem of chemical kinetics associated with the determination of mechanisms and the estimation of the rates constants of adsorption and desorption of substances on various catalysts.Forcitation:Kol’tsov N.I., Fedotov V.Kh. Study of carbon dioxide adsorption on chromoxide catalyst on non-stationary concentrations. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 7. P. 37-42

Study of carbon dioxide adsorption on chromium oxide and gallium oxide catalysts on the basis of linear relaxation times

2016 ◽  
Vol 89 (5) ◽  
pp. 719-726
Author(s):  
V. Kh. Fedotov ◽  
N. I. Kol’tsov ◽  
N. A. Gaidai ◽  
Yu. A. Agafonov ◽  
M. A. Botavina ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Chromium Oxide ◽  
Gallium Oxide ◽  
Relaxation Times ◽  
Oxide Catalysts ◽  
Linear Relaxation ◽  
Carbon Dioxide Adsorption

scholarly journals Utilization of spent dregs for the production of activated carbon for CO2 adsorption

2017 ◽  
Vol 19 (2) ◽  
pp. 44-50 ◽  
Author(s):  
Jarosław Serafin
Keyword(s):  
Carbon Dioxide ◽  
Activated Carbon ◽  
Density Functional ◽  
Activated Carbons ◽  
Density Functional Theory Method ◽  
Textural Properties ◽  
Carbon Dioxide Adsorption ◽  
Functional Theory ◽  
Surface Areas ◽  
Adsorption Desorption

Abstract The objective of this work was preparation of activated carbon from spent dregs for carbon dioxide adsorption. A saturated solution of KOH was used as an activating agent. Samples were carbonized in the furnace at the temperature of 550°C. Textural properties of activated carbons were obtained based on the adsorption-desorption isotherms of nitrogen at −196°C and carbon dioxide at 0°C. The specific surface areas of activated carbons were calculated by the Brunauer – Emmett – Teller equation. The volumes of micropores were obtained by density functional theory method. The highest CO2 adsorption was 9.54 mmol/cm3 at 0°C – and 8.50 mmol/cm3 at 25°C.

scholarly journals Carbon Dioxide Adsorption and Desorption Study Using Bimetallic Calcium Oxide Impregnated on Iron (III) Oxide

2017 ◽  
Vol 888 ◽  
pp. 479-484 ◽  
Author(s):  
Azizul Hakim ◽  
Mohd Ambar Yarmo ◽  
Tengku Sharifah Marliza ◽  
Maratun Najiha Abu Tahari ◽  
Wan Zurina Samad ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Calcium Oxide ◽  
Impregnation Method ◽  
Carbon Dioxide Adsorption ◽  
Adsorption And Desorption ◽  
Basic Sites ◽  
Desorption Temperature ◽  
Potential Source ◽  
Desorption Study ◽  
Adsorbent System

Bimetal adsorbent system of calcium oxide impregnated on iron (III) oxide were evaluated as a potential source of basic sites for CO2 capture. The adsorbents were prepared by impregnation method were calcined at 200 until 600 °C. Several characterizations were carried out using XRD, BET and CO2-TPD analysis. The CaO loading increased the basicity of the adsorbent significantly enhance the CO2 chemisorption. Furthermore, it drastically reduced the desorption temperature to 310-490 °C, which is important in chemisorption aspect. The CaO/Fe2O3200 which calcined at 200 °C was found to be most efficient. The CO2 chemisorption (81.29 mg CO2/g adsorbent) was contributed most compared to physisorption (4.64 mg CO2/g adsorbent).

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