Ozge Yuksel-Orhan

• PhD
• Professor (Associate) at Hacettepe University

The substantial energy demand of CO2-loaded solvent regeneration constitutes a significant economic challenge for the industrial applications of CO2 capture and utilization technologies. The nano-catalysts have the capability to improve CO2 desorption while reducing the energy demands for solvent regeneration. This study focuses on examining the ab...

Conventional methods of wastewater treatment sludge disposal, such as land disposal, storage, and burial, pose financial and environmental challenges. This research introduces an innovative facility that not only addresses sludge disposal but also utilizes it for energy production, surpassing the efficiency of lignite-based energy production. The f...

The CO2 absorption–desorption performances of nonaqueous trisolvent blended amines, monoethanolamine (MEA), 2‐amino‐2‐methyl‐1‐propanol (AMP), methyl diethanol amine (MDEA), 1‐dimethyl amino‐2‐propanol (1DMA2P), diethyl ethanol amine (DEEA), and piperazine (PZ), are investigated in terms of desorption parameters. Two trisolvent amine combinations,...

Natural gas has become a vital energy source due to its abundant availability and relatively low carbon emissions. However, the presence of impurities, such as sulfur compounds, nitrogen compounds, and acidic gases, poses significant challenges in both efficiently using natural gas and addressing its environmental impact. This chapter provides a co...

In a study, five types of sludge from the "Ankara Central Wastewater Treatment Plant" were used as fuel in chemical looping combustion (CLC), with red mud from "Eti Aluminum" serving as an oxygen carrier. Techniques like SEM-EDX, XRD, and XRF analyzed the process's efficiency. The results indicated that red mud is effective as an oxygen carrier, ma...

The CO2 emission issue has triggered the promotion of carbon capture and storage (CCS), particularly bio-route CCS as a sustainable procedure to capture CO2 using biomass-based activated carbon (BAC). The well-known multi-nitrogen functional groups and microstructure features of N-doped BAC adsorbents can synergistically promote CO2 physisorption....

Excessive emissions of carbon dioxide (CO2), a primary greenhouse gas, can cause serious environmental concerns, such as climate change and global warming. Therefore, carbon capture, utilization, and storage (CCUS) strategies are crucial for reducing the global carbon footprint. However, the considerable energy penalty in the regeneration of CO2-lo...

Chemical absorption of CO2 into aqueous amine‐based solvents is known as the most mature technology featuring high separation efficiencies and applicability of retrofitting. The high regeneration energy requirement of the process is a major drawback, and improvements in solvent design are required. This study investigated the CO2 absorption and des...

sterically hindered amines for enhanced CO 2 capture and conversion into carbonates S1. Experimental kinetics data (in terms of k 0,amine) of CO 2 reacting with AHPD or AMP over a concentration range of 0.10-0.50 kmol/m 3 and a temperature range of 298-353 K. T(K) ko, AHPD (s-1) Reaction Order 0.1 kmol/m 3 0.2 kmol/m 3 0.3 kmol/m 3 0.4 kmol/m 3 0.5

The present study highlights a hybrid approach to capture and convert carbon dioxide (CO 2) from exhaust gases using bovine carbonic anhydrase (CA) submerged into aqueous amine solvents. Particularly, the sterically hindered amines have unique properties to absorb CO 2 and also play a key role in wide range of industrial applications. In this work,...

Frustrated Lewis pairs (FLPs), combinations of sterically hindered Lewis acids and bases, are known for their ability to capture CO2. Although there have been several theoretical studies on the mechanisms of the reactions between CO2 and some FLP systems, experimental studies on the reaction kinetics have been inconclusive. In this study, the mecha...

Blends of ionic liquids (ILs) with monoethanolamine (MEA) in 1-hexanol were employed to enhance CO2 removal in comparison with that of pure MEA. A series of hydrophobic and hydrophilic 1-alkyl-3-methylimidazolium-based ionic liquids ([Cn-mim][Ac], [Cn-mim][Cl], and [Cn-mim][Tf2N] with n = 2 or 4) were studied to investigate the absorption/desorptio...

The CO2 absorption-desorption performance of non-aqueous solutions comprising a sterically hindered amine system (2-amino-2-ethyl-1,3-propanediol (AEPD): 1-hexanol) was investigated in a gas-liquid stirred cell reactor under sequential absorption-desorption cycles. The absorption capacity and initial absorption rate were calculated for different co...

The kinetics of the reactions of carbon dioxide (CO2) with aqueous solutions of two different sterically hindered amines (SHAs), 2‐amino‐2‐ethyl‐1,3‐propanediol (AEPD) and 2‐amino‐2‐methyl‐1,3‐propanediol (AMPD), in the presence and absence of carbonic anhydrase (CA) was investigated experimentally using stopped‐flow conductimetry. The amine concen...

The mechanism and kinetics of carbon disulfide (CS2) capture by aqueous solutions of well known alkanolamines ([monoethanolamine (MEA) and diethanolamine (DEA)] and novel cyclic mono- and polyamines [morpholine (MRPH), piperazine (PZ), n-methyl piperazine (NMPZ) and n-hydroxyethyl piperazine (NHEPZ)] were investigated by stopped-flow apparatus with...

Carbon dioxide (CO2) capture is a global concern because of its effect on climate change especially as regards to global warming. Among greenhouse gases, CO2 is the most abundant with high concentration released from post combustion processes into the atmosphere. For instance, the volume of CO2 emission from thermal power plants, petroleum refineri...

The mechanism and kinetics of CO2 capture using piperazine (PZ) promoted nonaqueous solutions of 2-amino-2-methyl-1,3-propanediol (AMPD) and 2-amino-2-ethyl-1,3-propanediol (AEPD) were investigated by stopped-flow technique. The termolecular mechanism was used to model the kinetics of the reactions. AMPD or AEPD like other sterically hindered amine...

CO2 absorption/desorption performance of 2-tert-Butyl-1,1,3,3-tetramethylguanidine (BTMG) and 1-Hexanol blend, which is a novel carbon dioxide binding organic liquid (CO2BOL) system, was studied in order to investigate the behavior of ultrasound-assisted desorption. Pure CO2 was first absorbed into a 10wt percent BTMG solution in a semi-batch stirr...

The reaction rates of CO2 with an innovative CO2-capturing organic solvent (CO2COS), consisting of blends of 2-tert-butyl-1,1,3,3-tetramethylguanidine (BTMG) and 1-propanol, were obtained as function of BTMG concentration and temperature. A stopped-flow apparatus with conductivity detection was used. The reaction was modeled by means of a modified...

It is generally accepted that CO2 emissions from point sources -such as thermal power plants- can be controlled by gas-liquid absorption where the process is intensified significantly by introducing a reactant into solvent. In this work, blends of 1-ethyl-3-methyl imidazolium bis (trifluoromethylsulfonyl) imide ([emim][Tf2N]) with 1,8-Diazabicyclo[...

Carbon dioxide capture, utilization and storage (CCUS) –including conversion to valuable chemicals-is a challenging contemporary issue having multi-facets. The prospect to utilize carbon dioxide (CO2) as a feedstock for synthetic applications in chemical and fuel industries -through carboxylation and reduction reactions-is the subject of this revie...

Carbon dioxide emissions from thermal power plants, hydrogen, and cement factories became one of the most important global concerns. Therefore, development of new sorbent materials and capture technologies to efficiently and economically remove CO2 gained importance. In the scope of this work, novel carbon dioxide binding organic solvents (CO2BOLs)...

In the scope of this work, new carbon dioxide binding organic liquids (CO2BOLs) were developed and kinetic parameters in terms of pseudo first-order rate constants for homogenous reaction between CO2 and CO2BOLs in 1-hexanol were obtained by using stopped-flow method with conductivity detection. As an amidine DBN (1,5-diazabicyclo[4.3.0]non-5-ene)...

Ionic liquid 1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([bmim][Tf2N]) and diethanolamine (DEA) blend in hexanol was examined experimentally to provide a dual solvent with high absorption capacity and low regeneration energy for post combustion CO2 absorption. For this purpose, kinetic parameters of the system with respect to ter...

In the present work, the reaction kinetics of CO2 absorption into new carbon dioxide binding organic liquids (CO2BOLs) was comprehensively studied to evaluate their potential for CO2 removal. A stopped-flow apparatus with conductivity detection was used to determine the CO2 absorption kinetics of novel CO2BOLs composed of DBN (1,5-Diazabicyclo[4.3....

A dual system, which aims to combine the individual advantages of two different solvents, has been developed for CO2 capture in order to intensify the process by reducing the reboiler duty. The dual system consisted of 1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([bmim][Tf2N]) and 1.8-diazabicyclo 5.4.0 undec-7-ene (DBU) in 1-hexa...

The reaction kinetics of carbon dioxide and CO2-binding organic liquids (CO2BOLs) promoted by piperazine (PZ) and its derivatives were investigated experimentally by stopped-flow conductimetry. The study was carried out at 298 K and for a concentration range of 0-0.25 kmol m−3 of PZ, 1-(2-aminoethyl)piperazine (AEPZ) or 1-(2-hydroxyethyl)piperazine...

Carbon dioxide emission from thermal power plants, hydrogen, ethylene oxide and cement factories became one of the most important global concerns. Therefore, development of new sorbent materials and CO2 capture technologies gained importance. CO2BOLs are the mixture of strong amidine or guanidine bases and n-alcohols. The primary advantages of thes...

The rate constants and the activation energies of the reaction between carbon dioxide and 1,1,3,3-tetramethylguanidine (TMG) in 1-propanol solution were measured by a stopped-flow technique at a temperature range of 288-308 K and at a TMG concentration range of 2.5-10.0 wt %. Based on the pseudo-first-order reaction for CO2, the reaction was modele...