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Modelling and thermodynamic properties of pure Co_(2)and fue gas sorption data on South African coals using Langmuir,Freundlich,Temkin,and extended Langmuir isotherm models

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International Journal of Coal Science & Technology 2022年第3期9卷 136-150页

作者： Major Mabuza Kasturie Premlall michael o.daramola Department of Chemical Engineering Faculty of Engineering and TechnologyVaal University of TechnologyP.O.Box 3595Secunda 2302South Africa Department of Chemical Metallurgical and Materials EngineeringFaculty of Engineering and the Built EnvironmentTshwane University of TechnologyPrivate Bag X680Pretoria 0001South Africa Department of Chemical Engineering Faculty of EngineeringBuilt Environment and Information TechnologyUniversity of PretoriaHatfeldPretoria 0028South Africa

Carbon sequestration in unmineable coal seams has been proposed as one of the most attractive technologies to mitigate carbon dioxide(Co_(2))emissions in which Co_(2)is stored in the microporous structure of the coal matrix in an adsorbed *** Co_(2)adsorption process is hence considered one of the more efective methodologies in environmental ***,adsorption isotherm measurements and modelling are key important scientifc measures required in understanding the adsorption system,mechanism,and process optimization in *** this paper,three renowned and reliable adsorption isotherm models were employed including Langmuir,Freundlich,and Temkin for pure Co_(2)adsorption data,and the extended-Langmuir model for multicomponent,such as fue gas mixture-adsorption data as investigated in this research ***,signifcant thermodynamics properties including the standard enthalpy change(ΔH°),entropy change(ΔS°),and Gibbs free energy(ΔG°)were assessed using the van’t Hof *** statistical evaluation of the goodness-of-ft was done using three(3)statistical data analysis methods including correlation coefcient(R^(2)),standard deviation(σ),and standard error(SE).The Langmuir isotherm model accurately represent the pure Co_(2)adsorption on the coals than Freundlich and *** extended Langmuir gives best experimental data ft for the fue *** thermodynamic evaluations revealed that Co_(2)adsorption on the South African coals is feasible,spontaneous,and exothermic;and the adsorption mechanism is a combined physical and chemical interaction between the adsorbate and the adsorbent.

关键词： Global warming Flue gas Adsorption Unmineable coal Adsorption models

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Modelling and experimental investigation of effects of moisture and operating parameters during the adsorption of Co2 onto polyaspartamide

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International Journal of Coal Science & Technology 2019年第2期6卷 225-234页

作者： Kelvin o.Yoro Mutiu K.Amosa Patrick T.Sekoai michael o.daramola School of Chemical and Metallurgical Engineering Faculty of Engineering and the Built Environment University of the Witwatersrand Private Bag X3 Wits 2050 Johannesburg South Africa Environmental Engineering and Management Research Group Ton Due Thang University Ho Chi Minh City Vietnam Faculty of Environment and Labour Safety Ton Due Thang University Ho Chi Minh City Vietnam

Parametric effect of moisture and influence of operating variables on the adsorption behaviour of polyaspartamide during Co2 capture was investigated in this study using experimental and modelling approach. Individual effects of operating conditions (e.g. pressure, temperature and gas flow rates) as well as the effect of moisture on the adsorption capacity of polyaspartamide were methodically investigated using Dubinin-Raduskevich model. Results from the investigations reveal that the presence of moisture in the flue gas had an incremental effect on the adsorption capacity of polyaspartamide;thereby showcasing the potential of polyaspartamide as a suitable hydrophilic material for Co2 capture in power plants. In addition, pressure, temperature and gas flow rates at 200 kPa, 403 K, and 1.5 mL/s, respectively, sig? nificantly influenced the Co2 adsorption capacity of polyaspartamide. Physisorption and chemisorption both governed the adsorption process while equilibrium studies at different temperatures showed that Langmuir isotherm could adequately describe the adsorption behaviour of the material with best fit with R^2>0.95.

关键词： Adsorption capacity Co2 capture Moisture operating variables Polyaspartamide

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Nanocomposite sodalite/ceramic membrane for pre-combustion Co2 capture： synthesis and morphological characterization

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International Journal of Coal Science & Technology 2017年第1期4卷 60-66页

作者： michael o. daramola olawale oloye Abu Yaya School of Chemical and Metallurgical Engineering Facultyof Engineering and the Built Environment University of theWitwatersrand Wits Johannesburg 2050 South Africa Department of Materials Science & Engineering School ofEngineering Sciences University of Ghana P.O Box LG 77Legon Accra Ghana

Carbon capture and storage （CCS） is amongst the possible options to reduce Co2 emission. In the application of CCS, Co2 capture techniques such as adsorption and membrane system have been proposed due to less energy requirement and environmental benign than the absorption process. However, membrane system has drawbacks such as poor membrane reproducibility, scale-up difficulty and high cost of the membrane supports. In this study synthesis and characterization of nanocomposite sodalite （HS）/ceramic membrane via ＂pore-plugging＂ hydrothermal synthesis （PPH） protocol for pre- combustion Co2 capture is reported. The morphology and crystallinity of the as-prepared membranes were checked with scanning electron microscopy and X-ray diffraction. Surface chemistry of the membrane was examined with Fourier Transform Infrared spectroscopy. In nanocomposite architecture membranes, zeolite crystals are embedded within the pores of the supports instead of forming thin-film layers of the zeolite crystals on the surface of the supports. Compared to the conventional in situ direct hydrothermal synthesis, membranes obtained from PPH possess higher mechanical strength and thermal stability. In addition, defect control with nanocomposite architecture membranes is possible because the zeolite crystals are embedded within the pores of the support, thereby limiting the maximum defect size to the pore size of the support. Furthermore, the nanocomposite architecture nature of the membranes safeguards the membrane from shocks or abrasion that could promote formation of defects. The aforementioned advantages of the nanocomposite architecture membranes could be beneficial in developing high performance and cost-effective membrane materials for pre-combustion Co2 capture.

关键词： Nanocomposite Sodalite Membrane Carbon capture and storage

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Synthesis and evaluation of carbon nanotubes composite adsorbent for Co2 capture： a comparative study of Co2 adsorption capacity of single-walled and multi-walled carbon nanotubes

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International Journal of Coal Science & Technology 2017年第1期4卷 41-49页

作者： Keren osier Dhruti Dheda Jacob Ngoy Nicola Wagner michael o. daramola School of Chemical and Metallurgical Engineering Facultyof Engineering and the Built Environment University of theWitwatersrand Private Bag X3 Wits 2050 JohannesburgSouth Africa Department of Geology University of JohannesburgPO Box 524 Auckland Park Johannesburg 2006 SouthAfrica

As a preliminary investigation towards obtaining carbon nanotube composite adsorbent for Co2 capture, in this study Co2 adsorption performance of three commercial carbon nanotubes （CNTs） one single-walled carbon nanotubes （SWCNTs）, and two （2） different multi-walled carbon nanotubes （referred to as A-MWCNTs and B-MWCNTs） were evaluated and compared. The purpose of this study was to compare the different types of CNTs and select the best to serve as the solid anchor in the development of a hydrophobic composite adsorbent material for Co2 capture. The N2 physi- sorption of the CNTs was conducted to determine their surface area, pore volume and pore size. In addition, morphology and purity of the CNTs were checked with Transmission Electron Microscopy and Raman Spectroscopy, respectively. The Co2 adsorption capacity of the CNTs was evaluated using Thermo-gravimetric analysis （TGA） at 1.1 bar, at operating temperature ranged from 25 to 55 ~C and at different Co2 feed flow rates, in order to evaluate the effects of these variables on the Co2 adsorption capacity. The results of Co2 adsorption with the TGA show that Co2 adsorption capacity for both SWCNTs and MWCNTs was the highest at 25 ~C. Changing the Co2 flowrates had no significant effect on the adsorption capacity of MWCNTs, but decreasing the Co2 flow rate resulted in the enhancement of the Co2 adsorption capacity of SWCNTs. overall, it was found that the SWCNTs displayed the highest Co2 adsorption capacity （29.97 gCo2/kg ad- sorbent） when compared to the MWCNTs （12.09 gCo2/kg adsorbent）, indicating a 150% increase in adsorption capacity over MWCNTs.

关键词： Co2 Capture Adsorption Carbon nanotubes Single-walled nanotubes Multi-walled nanotubes

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Comparative study of thermophilic and mesophilic anaerobic treatment of purified terephthalic acid (PTA) wastewater

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Natural Science 2011年第5期3卷 371-378页

作者： michael o. daramola Elizabeth F. Aransiola Adeniyi G. Adeogun 不详

The paper provides a critical comparison between mesophilic and thermophilic anaerobic treatment of PTA wastewater through diagnosis of a case study. Aspects covered are bioavailability, biodegradability, microbial population, thermodynamics, kinetics involved and bio-reactor design for PTA wastewater treatment. The results of the case study suggests that one- stage thermophilic anaerobic reactor coupled with coagulation-flocculation pre-treatment unit and an aerobic post treatment unit could be techno-economically viable for PTA wastewater treatment to ensure that the final effluent quality conforms to the international standard. The in-formation emanated from this study could be useful and thought provoking to the professionals and academia in the area of PTA wastewater treatment and can serve as impetus toward the development of research lines in similar problems like the treatment of other petrochemical wastewater such as phenol-con- taining wastewater, benzene/benzoic acid-con- taining wastewater or wastewater from other similar industrial settings.

关键词： Terephthalic Acid Wastewater Treatment Anaerobic and Aerobic Treatment Me-sophilic and Thermophilic Conditions Bioreactors

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Homogeneously Catalyzed Transesterification of Nigerian <i>Jatropha curcas</i>oil into Biodiesel: A Kinetic Study

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Modern Research in Catalysis 2013年第3期2卷 83-89页

作者： Elizabeth F. Aransiola michael o. daramola Tunde Victor ojumu Bamidele ogbe Solomon Stephen K. Layokun Biochemical and Reaction Engineering Department of Chemical Engineering Obafemi Awolowo University Ile-Ife Nigeria Department of Chemical Engineering Cape Peninsula University of Technology Cape Town South Africa School of Chemical & Metallurgical Engineering Faculty of Engineering & The Built Environment University of the Witwatersrand Johannesburg South Africa

As a follow-up to our previous study on the transesterification of Nigerian Jatropha curcas oil into Biodiesel using homogenous catalysis, kinetic study of the reaction is hereby presented. The kinetic study revealed that the rate of formation of biodiesel can be increased by increasing reaction temperature and oil to alcohol molar ratio. The optimum reaction condition was established to be 60°C (reaction temperature) and 1:6 (oil to alcohol ratio). Accordingly, the highest biodiesel yield obtained from homogeneously catalyzed transesterification of Nigerian Jatropha curcas (JC) oil into Biodiesel was 86.61% w/w at 60°C with oil to alcohol ratio of 1:6. Furthermore, kinetic study also revealed that conversion of triglyceride to diglyceride was the rate determining step (RDS) of the overall reaction because activation energy of its backward reaction is lower than that of the forward reaction, indicating unstable nature and higher potential energy of the diglyceride in comparison to the triglyceride.

关键词： Homogenous Catalysis Transesterification Biodiesel Jatropha curcas

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