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Kinetic of CO2 absorption and carbamate formation in aqueous solutions of diethanolamine
Mohamed Kheireddine Aroua,Abdelbaki Benamor,Brahim Si Ali 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.3
The absorption rates of CO2 into aqueous solutions of Diethanolamine (DEA) with varying concentrations from 0.2 to 4M and temperature range from 293 to 323 K were measured by using a laboratory stirred reactor. The CO2 partial pressure was varied in a range that the reaction would occur in pseudo first order regime. Experimental data were analyzed and the kinetic parameters associated with the reaction were determined. The activation energy for the deprotonation of the intermediate zwitterion was estimated at about 11.4 kcal/mol. The contribution of carbamate formation to the overall absorbed CO2 was experimentally evaluated and found to be of the order of 100%.
Mohamed Kheireddine Aroua,Mohd Azlan Hussain,Chun-Yang Yin,Ramzalina Abd Rahman,Noor Asriah Ramli 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.6
The solubility of CO2 in single monoethanolamine (MEA) and diethanolamine (DEA) solutions was predicted by a model developed based on the Kent-Eisenberg model in combination with a neural network. The combination forms a hybrid neural network (HNN) model. Activation functions used in this work were purelin, logsig and tansig. After training, testing and validation utilizing different numbers of hidden nodes, it was found that a neural network with a 3-15-1 configuration provided the best model to predict the deviation value of the loading input. The accuracy of data predicted by the HNN model was determined over a wide range of temperatures (0 to 120 oC), equilibrium CO2 partial pressures (0.01 to 6,895 kPa) and solution concentrations (0.5 to 5.0M). The HNN model could be used to accurately predict CO2 solubility in alkanolamine solutions since the predicted CO2 loading values from the model were in good agreement with experimental data.
Mohammed Harun Chakrabarti,Wei Tze Mook,Mohamed Kheireddine Taeib Aroua,Ishenny Muhammad Noor,Muhammad Faisal Irfan,Chee Tong John Low 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.1
The main factor that determines the success of a bio-electrochemical system (BES) is the bio-electrode. This paper reviews the direct as well as mediated electron transfer mechanisms in bio-electrodes. Some discussions on their influence upon the performance of microbial fuel and electrolysis cells are considered. Factors affecting organic matter removal at bioanodes and denitrification at biocathodes are elaborated upon. Important parameters for the successful simultaneous removal of contaminants are reported. The major conclusion from this work is that BES is able to remove organic matter and nitrates simultaneously from different wastewater samples at efficiencies greater than 90%.
Andrew Ng Kay Lup,Faisal Abnisa,Wan Mohd Ashri Wan Daud,Mohamed Kheireddine Aroua 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.56 No.-
Catalytic deoxygenation is a fundamental process for bio-oil upgrading due to its high oxygen contentwhich will result in lower heating value, corrosion and instability issues. The discovery of an excellentheterogeneous deoxygenation metal catalyst with high deoxygenation activity is a necessarybreakthrough for an optimized bio-oil catalytic deoxygenation. For an effective deoxygenation supportedmetal catalyst, properties such as high H2 sticking coefficient, optimal metal-oxygen bond strength andsuitable acid strength from support are needed to ensure facile scission of C O bonds and activation ofH2 and O-containing compounds. Metals such as Fe, Ru, Sn, W, Zr and supports such as C, TiO2, ZrO2 whichare oxophilic were also observed to enhance direct removal of oxygen from O-containing compounds dueto their high C O and C¼O bond affinities. The choice of support is important to ensure it has optimalphysicochemical properties for facile deoxygenation and the optimal acid strength to enhance C Ohydrogenolysis activity while minimizing coke formation. The choice of metal is dependent on the type ofmodel compound since different metals catalyze different reaction pathways of the deoxygenation ofmodel compounds. This review presents on the use of heterogeneous metal catalysts in thedeoxygenation of bio-oil model compounds through several perspectives which are catalytic properties,reaction conditions, deactivation and regeneration of metal catalysts. In addition, several outlooks on thefeasible range of reaction condition for catalytic deoxygenation and criteria of excellent deoxygenationsupported metal catalysts were also expressed in this article based on the studies on the literatures.
Advancement in recycling waste tire activated carbon to potential adsorbents
Umi Fazara Md Ali,Farihahusnah Hussin,Subash C.B. Gopinath,Mohamed Kheireddine Aroua,Mohd Hairul Khamidun,Norwahyu Jusoh,Naimah Ibrahim,Syahirah Faraheen Kabir Ahmad 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.6
Waste tires have been identified as one of the contributors to environmental problems and the issue of inadequate landfill spaces. The lack of consistent and systematic approaches such as specific regulations/laws or mechanisms of waste management to waste tires, limited application of technology for recycling waste tires and lack of awareness on the impacts of waste tires problem, make waste tires a source of environmental pollution. Various researches have been conducted on recycling waste tires into polymer bends, and materials to harden concretes, fuels and adsorbent. Researchers suggested that pyrolysis is the current trend of recycling waste tire to harvest the saleable pyrolysis oil and the recycled carbon black. Therefore, this review attempts to compile relevant knowledge about the potential of adsorbent derived from waste tires to be applied in the removal of various types of pollutants like heavy metals, organic pollutants, dye and air/gaseous pollutant. Studies were carried out on revealing the properties and the characteristics of activated carbon derived from waste tire as effective adsorbent which influence the application performance at liquid or gas phase. In addition, the challenges in the production of activated carbon derived from waste tire were discussed.
Harvesting Electricity from CO2 Emission: Opportunities, Challenges and Future Prospects
Peter Adeniyi Alaba,Shaukat Ali Mazari,Hamisu Umar Farouk,Samuel Eshorame Sanni,Oluranti Agboola,Ching Shya Lee,Faisal Abnisa,Mohamed Kheireddine Aroua,Wan Mohd Ashri Wan Daud 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.8 No.3
The ever-increasing CO2 emission has necessitated the search for suitable technologies for CO2 utilization at a low cost. Recently, a novel concept called reactive gas electrosorption (RGE) for energy harvesting from CO2 emission, which could boost the efficiency of a thermal power plant by 5% was proposed by Hamelers and coworkers. The concept involves mixing of air stream with a low CO2 concentration with a stream of high CO2 concentration in an alkaline aqueous electrolyte. However, this concept is faced with the challenges of designs specific for CO2-electrolyte, and inadequate performance of the electrode materials. Therefore, this study showcases electricity generation opportunities from CO2 via RGE and discussed challenges and prospect. The study reveals that the drawback relating to the electrode could be solved using heteroatom doped traditional carbon materials and composite carbon-based materials, which has been successfully used in capacitive cells designed for desalination. This modification helps to improve the hydrophilicity, thereby improving electrode wettability, and suppressing faradaic reaction and co-ion repulsion effect. This improvement could enhance the charge efficiency, sorption capacity durability of electrodes and reduce the energy loss in RGE. Moreover, intensification of the membrane capacitive deionization (MCDI) process to obtain variances like enhanced MCDI and Faradaic MCDI. Hybrid capacitive deionization (HCDI) is also a promising approach for improvement of the capacitive cell design in RGE. This intensification can improve the electrosorption capacity and minimize the negative effect of faradaic reaction. The use of alternative amine like Piperazine, which is less susceptible to degradation to boosting CO2 dissolution is also suggested.