oguz caniaz | Koç University (original) (raw)

Papers by oguz caniaz

Research paper thumbnail of A bituminous mixture comprising polyurethane obtained by a polymerization reaction and a preparation method thereof

A method for preparing a modified bituminous mixture is developed according to the present invent... more A method for preparing a modified bituminous mixture is developed according to the present invention, this method comprising the steps of fluidizing bitumen as the main component of the mixture at 130-140°C; transferring the fluidized bitumen into a mechanical mixer running at 120 rpm stirring speed; producing a polyurethane-bitumen mixture by adding polyurethane, as an additive in hot form, obtained through a polymerization reaction of BHET monomers obtained through a recycling reaction of waste PET products, as a diol monomer with diisocyanate monomer and a chain extender into bitumen in said mixer while stirring continues; stirring further this mixture for a predetermined time at a predetermined stirring speed to obtain a homogeneous polyurethane-bitumen mixture; following the completion of the stirring process, obtaining a homogeneous polyurethane-added modified bituminous mixture.

Research paper thumbnail of 387709 Analysis of Commercial and Synthesized H2S Scavengers for High Performance, Safe and More Economical Asphalt Roads

Research paper thumbnail of Process intensification for heavy oil upgrading using supercritical water

Chemical Engineering Research and Design, 2014

Demand for light hydrocarbons has been steadily increasing in the market with a corresponding dec... more Demand for light hydrocarbons has been steadily increasing in the market with a corresponding decrease in heavy hydrocarbon demand. Therefore, there is a need to develop environmentally friendly and efficient technologies for conversion of heavy molecular weight hydrocarbons. Supercritical fluids (SCF) are attracting increased attention as solvents for green chemistry and among those supercritical water (SCH 2 O) is promising for the upgrading of heavy hydrocarbons. Because of a sharp decrease in its dielectric constant, water loses its polarity when brought to the supercritical conditions and its properties starts to resemble the properties of hydrocarbons and becomes an excellent solvent for organic compounds. Moreover, increased ionic product of water leads to an increasing [H 3 O + ] concentration and thus promotes the reactions requiring the addition of an acid. Solvation power enables the extraction of lighter compounds while increased [H 3 O + ] concentration makes the reactive extractions of heavy hydrocarbons possible. As a result of its favorable properties, a wide variety of process intensification studies have been carried out using near critical or SCH 2 O such as combined distillation-cracking-fractionation and in some cases even without the utilization of catalysts and/or hydrogen. In this review, recent advances on reactions of hydrocarbons occurring in a SCH 2 O environment will be highlighted. Fundamental aspects of these reactions including their thermodynamics and kinetics will be discussed. Experimental and theoretical developments on phase equilibria of relevant water-hydrocarbons systems will be presented.

Research paper thumbnail of Refinery bitumen and domestic unconventional heavy oil upgrading in supercritical water

The Journal of Supercritical Fluids, 2019

Highlights of the article  Various refinery bitumens and tar sand bitumen were upgraded in SCW ... more Highlights of the article  Various refinery bitumens and tar sand bitumen were upgraded in SCW  SCW was found to suppress coke formation compared to pyrolysis  Coke yield decreased from 28% in pyrolysis to 21.3 wt.% in SCW for tar sand.  Least amount of coke (17.2 wt. %) was obtained by using FCC spent catalysts.  Highest amount of liquids was obtained by red mud catalysts.

Research paper thumbnail of Upgrading blends of microalgae feedstocks and heavy oils in supercritical water

The Journal of Supercritical Fluids

Research paper thumbnail of Gelation Stabilized Functional Composite-Modified Bitumen for Anti-icing Purposes

Industrial & Engineering Chemistry Research, 2015

Research paper thumbnail of Interaction and Reaction of Coadsorbed NO and CO on a Rh(100) Single Crystal Surface †

Langmuir, 2010

In order to assess the possibility to follow surface reactions in a quantitative way by vibration... more In order to assess the possibility to follow surface reactions in a quantitative way by vibrational spectroscopy, a combination of temperature programmed reaction spectroscopy (TPRS) and reflection absorption infrared spectroscopy (RAIRS) has been used to study the decomposition of NO and the reaction between NO and CO on Rh(100). NO adsorbs in two configurations: in an almost parallel position at coverages below 0.18 ML and, in addition, in an upright position, probably on a bridge site, at all coverages. Coadsorbing NO and CO has only a minor influence on NO binding, whereas CO shifts gradually from top toward the bridge site under the influence of NO. Combining TP-RAIRS with TPRS during the reaction between CO and NO enabled us to simultaneously study site occupation and obtain qualitative surface coverages and desorption rates. At low surface coverages, NO dissociation is observed at lower temperatures than CO(2) formation. Near saturation, NO dissociation becomes blocked and shifts up in temperature. NO dissociation occurs simultaneously with CO(2) formation. To decompose NO, free surface sites have to be generated through surface diffusion or desorption of some CO. During NO decomposition, the formed oxygen atoms react with CO to form CO(2), creating more empty sites. This may lead to an explosive surface reaction.

Research paper thumbnail of Interaction and reaction of coadsorbed NO and CO on a Rh(100) single crystal surface

Langmuir, 2010

In order to assess the possibility to follow surface reactions in a quantitative way by vibration... more In order to assess the possibility to follow surface reactions in a quantitative way by vibrational spectroscopy, a combination of temperature programmed reaction spectroscopy (TPRS) and reflection absorption infrared spectroscopy (RAIRS) has been used to study the decomposition of NO and the reaction between NO and CO on Rh(100). NO adsorbs in two configurations: in an almost parallel position at coverages below 0.18 ML and, in addition, in an upright position, probably on a bridge site, at all coverages. Coadsorbing NO and CO has only a minor influence on NO binding, whereas CO shifts gradually from top toward the bridge site under the influence of NO. Combining TP-RAIRS with TPRS during the reaction between CO and NO enabled us to simultaneously study site occupation and obtain qualitative surface coverages and desorption rates. At low surface coverages, NO dissociation is observed at lower temperatures than CO(2) formation. Near saturation, NO dissociation becomes blocked and shifts up in temperature. NO dissociation occurs simultaneously with CO(2) formation. To decompose NO, free surface sites have to be generated through surface diffusion or desorption of some CO. During NO decomposition, the formed oxygen atoms react with CO to form CO(2), creating more empty sites. This may lead to an explosive surface reaction.

Research paper thumbnail of A bituminous mixture comprising polyurethane obtained by a polymerization reaction and a preparation method thereof

A method for preparing a modified bituminous mixture is developed according to the present invent... more A method for preparing a modified bituminous mixture is developed according to the present invention, this method comprising the steps of fluidizing bitumen as the main component of the mixture at 130-140°C; transferring the fluidized bitumen into a mechanical mixer running at 120 rpm stirring speed; producing a polyurethane-bitumen mixture by adding polyurethane, as an additive in hot form, obtained through a polymerization reaction of BHET monomers obtained through a recycling reaction of waste PET products, as a diol monomer with diisocyanate monomer and a chain extender into bitumen in said mixer while stirring continues; stirring further this mixture for a predetermined time at a predetermined stirring speed to obtain a homogeneous polyurethane-bitumen mixture; following the completion of the stirring process, obtaining a homogeneous polyurethane-added modified bituminous mixture.

Research paper thumbnail of 387709 Analysis of Commercial and Synthesized H2S Scavengers for High Performance, Safe and More Economical Asphalt Roads

Research paper thumbnail of Process intensification for heavy oil upgrading using supercritical water

Chemical Engineering Research and Design, 2014

Demand for light hydrocarbons has been steadily increasing in the market with a corresponding dec... more Demand for light hydrocarbons has been steadily increasing in the market with a corresponding decrease in heavy hydrocarbon demand. Therefore, there is a need to develop environmentally friendly and efficient technologies for conversion of heavy molecular weight hydrocarbons. Supercritical fluids (SCF) are attracting increased attention as solvents for green chemistry and among those supercritical water (SCH 2 O) is promising for the upgrading of heavy hydrocarbons. Because of a sharp decrease in its dielectric constant, water loses its polarity when brought to the supercritical conditions and its properties starts to resemble the properties of hydrocarbons and becomes an excellent solvent for organic compounds. Moreover, increased ionic product of water leads to an increasing [H 3 O + ] concentration and thus promotes the reactions requiring the addition of an acid. Solvation power enables the extraction of lighter compounds while increased [H 3 O + ] concentration makes the reactive extractions of heavy hydrocarbons possible. As a result of its favorable properties, a wide variety of process intensification studies have been carried out using near critical or SCH 2 O such as combined distillation-cracking-fractionation and in some cases even without the utilization of catalysts and/or hydrogen. In this review, recent advances on reactions of hydrocarbons occurring in a SCH 2 O environment will be highlighted. Fundamental aspects of these reactions including their thermodynamics and kinetics will be discussed. Experimental and theoretical developments on phase equilibria of relevant water-hydrocarbons systems will be presented.

Research paper thumbnail of Refinery bitumen and domestic unconventional heavy oil upgrading in supercritical water

The Journal of Supercritical Fluids, 2019

Highlights of the article  Various refinery bitumens and tar sand bitumen were upgraded in SCW ... more Highlights of the article  Various refinery bitumens and tar sand bitumen were upgraded in SCW  SCW was found to suppress coke formation compared to pyrolysis  Coke yield decreased from 28% in pyrolysis to 21.3 wt.% in SCW for tar sand.  Least amount of coke (17.2 wt. %) was obtained by using FCC spent catalysts.  Highest amount of liquids was obtained by red mud catalysts.

Research paper thumbnail of Upgrading blends of microalgae feedstocks and heavy oils in supercritical water

The Journal of Supercritical Fluids

Research paper thumbnail of Gelation Stabilized Functional Composite-Modified Bitumen for Anti-icing Purposes

Industrial & Engineering Chemistry Research, 2015

Research paper thumbnail of Interaction and Reaction of Coadsorbed NO and CO on a Rh(100) Single Crystal Surface †

Langmuir, 2010

In order to assess the possibility to follow surface reactions in a quantitative way by vibration... more In order to assess the possibility to follow surface reactions in a quantitative way by vibrational spectroscopy, a combination of temperature programmed reaction spectroscopy (TPRS) and reflection absorption infrared spectroscopy (RAIRS) has been used to study the decomposition of NO and the reaction between NO and CO on Rh(100). NO adsorbs in two configurations: in an almost parallel position at coverages below 0.18 ML and, in addition, in an upright position, probably on a bridge site, at all coverages. Coadsorbing NO and CO has only a minor influence on NO binding, whereas CO shifts gradually from top toward the bridge site under the influence of NO. Combining TP-RAIRS with TPRS during the reaction between CO and NO enabled us to simultaneously study site occupation and obtain qualitative surface coverages and desorption rates. At low surface coverages, NO dissociation is observed at lower temperatures than CO(2) formation. Near saturation, NO dissociation becomes blocked and shifts up in temperature. NO dissociation occurs simultaneously with CO(2) formation. To decompose NO, free surface sites have to be generated through surface diffusion or desorption of some CO. During NO decomposition, the formed oxygen atoms react with CO to form CO(2), creating more empty sites. This may lead to an explosive surface reaction.

Research paper thumbnail of Interaction and reaction of coadsorbed NO and CO on a Rh(100) single crystal surface

Langmuir, 2010

In order to assess the possibility to follow surface reactions in a quantitative way by vibration... more In order to assess the possibility to follow surface reactions in a quantitative way by vibrational spectroscopy, a combination of temperature programmed reaction spectroscopy (TPRS) and reflection absorption infrared spectroscopy (RAIRS) has been used to study the decomposition of NO and the reaction between NO and CO on Rh(100). NO adsorbs in two configurations: in an almost parallel position at coverages below 0.18 ML and, in addition, in an upright position, probably on a bridge site, at all coverages. Coadsorbing NO and CO has only a minor influence on NO binding, whereas CO shifts gradually from top toward the bridge site under the influence of NO. Combining TP-RAIRS with TPRS during the reaction between CO and NO enabled us to simultaneously study site occupation and obtain qualitative surface coverages and desorption rates. At low surface coverages, NO dissociation is observed at lower temperatures than CO(2) formation. Near saturation, NO dissociation becomes blocked and shifts up in temperature. NO dissociation occurs simultaneously with CO(2) formation. To decompose NO, free surface sites have to be generated through surface diffusion or desorption of some CO. During NO decomposition, the formed oxygen atoms react with CO to form CO(2), creating more empty sites. This may lead to an explosive surface reaction.