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Fuel3
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CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY2
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ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS2
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INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY1
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY1
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JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY1
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PROCESSES1
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REACTION KINETICS MECHANISMS AND CATALYSIS1
The effects of Fe2O3 based DOC and SCR catalyst on the exhaust emissions of diesel engines
Resitoglu, Ibrahim Aslan
The effects of Fe2O3 based DOCs (Diesel Oxidation Catalyst) and SCR (Selective Catalytic Reduction) catalysts on the exhaust emissions of diesel engine were investigated in this experimental study. The investigated catalysts, Al2O3 - TiO2/CeO2/Fe2O3 (ATCF) and Al2O3- Nb2O5/CeO2/Fe2O3 (ANCF), were produced with impregnation method and aged for 6 h at 600 degrees C. FE-SEM (Field Emission Scanning Electron Microscopy), XRD (X-Ray Diffraction), XRF (X-Ray Fluorescence) and BET (Brunauer-Emmett-Teller) Surface Area analyzes were carried out to determine the specifications of catalysts. The catalytic performances of the DOCs were tested for the oxidation of CO, HC, PM, NO while SCR catalysts were tested for SCR of NOx using NH3. An individual exhaust system was built up and mounted to the engin...
Development of Fe2O3 based catalysts to control pollutant emissions in diesel engines
Resitoglu, Ibrahim Aslan | Yıldırımcan, Saadet
Exhaust after treatment systems have become a necessity to eliminate pollutant emissions as required by standard. Nowadays, DOC and SCR are widely used after treatment technologies in diesel vehicles. In this experimental study carried on DOC and SCR systems, two different catalysts as Al2O3-TiO2/Fe2O3 and Al2O3-Pt/Fe2O3 were produced with impregnation method. The catalysts were characterized by Field Emission-Scanning Electron Microscope (FE-SEM), X-ray diffraction (XRD), X-ray fluorescence (XRF) and Brauner-Emmett-Teller (BET). Each catalyst was tested as DOC and SCR in real working state to see the effect of catalyst on pollutant emissions in diesel engine. Results showed that the use catalysts as DOC led to significant decrease in CO, HC, NO and smoke emissions. The exhaust temperature...
Using Pd(II) and Ni(II) complexes with N,N-dimethyl-N′-2-chlorobenzoylthiourea ligand as fuel additives in diesel engine
Resitoglu, Ibrahim Aslan | Avsar, Gokturk | Buldum, Barış
Fuel additives have been used to improve engine performance and also to reduce the pollutant emissions that occur after the combustion in engine. The effect of additions of bis-(N,N-dimethyl-N'-2-chloroben zoylthioureato) palladium (II), PdL2 and bis-(N, N-dimethyl-N'-2-chlorobenzoylthioureato) nickel (II), NiL2 complexes into diesel as metal additives was investigated experimentally. PdL2 and NiL2 complexes were added as 50 and 100 ppm to diesel and the properties (density, viscosity, calorific value, Cetane number, sulphur content, flash point, pour point and copper strip corrosion) of each test fuel were investigated. In general, the metal additives haven't led to major changes on fuel properties of diesel. However pour point values of additive blends reduced while flash ...
Biodiesel production from free fatty acids and the effects of its blends with alcohol-diesel on engine characteristics
Resitoglu, Ibrahim Aslan
In this experimental study, biodiesel production from free fatty acids of soybean oil and the effects of its blends with alcohol-diesel on diesel engine performance and exhaust emissions were studied. Crude glycerine was neutralized to produce the free fatty acids. Methyl alcohol was reacted with the free fatty acids in the presence of acid catalyst to form biodiesel. Biodiesel, diesel, and alcohols were mixed at different volumetric ratios, and the properties of each blend were determined. The blends and diesel were tested in a single cylinder direct injection diesel engine at full-load conditions. In conclusion, torque and power characteristics of blends were found similar to those of diesel. Break specific fuel consumption of the blends slightly increased depending on lower heating valu...
Selective catalytic reduction of NOx emissions by hydrocarbons over Ag-Pt/Al2O3 catalyst in diesel engine
Resitoglu, Ibrahim Aslan
Selective catalytic reduction is an application used to control NOx pollutants in diesel engines. Aqueous urea solution, commercially called AdBlue and obtained by mixing pure water and NH3, is the most commonly used reductant while the V2O5-WO3/TiO2 structure has a widespread use as catalyst in SCR technology. However, the SCR systems included AdBlue and V2O5-WO3/TiO2 structure have low NOx conversion efficiency at low exhaust gas temperatures. The use of hydrocarbons as reductant and catalysts containing silver improves the conversion efficiency of selective catalytic reduction systems at low exhaust temperatures. In this work, selective catalytic reduction of NOx emissions from diesel engines in the presence of hydrocarbons has been studied. While ethanol and biodiesel mixtures were use...
INFLUENCE OF TITANIUM BASED FUEL ADDITIVE ON DIESEL ENGINE PERFORMANCE AND EMISSIONS
Resitoglu, Ibrahim Aslan
Fuel additives provides an increase on engine performance and a reduction in the amount of the exhaust emissions as a result of improving fuel properties and combustion efficiency of internal combustion engines. In this experimental study, it is investigated the effect of using titanium (diizopropoksit bis) as a fuel additive on diesel engine and emissions. Titanium fuel additive and diesel fuel (D) were mixed with 25, 50, 75, 100 ppm values. In order to determine the performance and exhaust emissions characteristics, a single cylinder diesel engine was fuelled with blended fuels and tested at full load conditions. In conclusion, engine torques and power values of blended fuels were found to have similar values of diesel while specific fuel consumption values decreased. The use of titanium...
The pollutant emissions from diesel-engine vehicles and exhaust aftertreatment systems
Resitoglu, Ibrahim Aslan
Diesel engines have high efficiency, durability, and reliability together with their low-operating cost. These important features make them the most preferred engines especially for heavy-duty vehicles. The interest in diesel engines has risen substantially day by day. In addition to the widespread use of these engines with many advantages, they play an important role in environmental pollution problems worldwide. Diesel engines are considered as one of the largest contributors to environmental pollution caused by exhaust emissions, and they are responsible for several health problems as well. Many policies have been imposed worldwide in recent years to reduce negative effects of diesel engine emissions on human health and environment. Many researches have been carried out on both diesel e...
The Optimization of the Esterification Reaction in Biodiesel Production from Trap Grease
Resitoglu, Ibrahim Aslan
In this experimental study, biodiesel production from waste oils (trap grease), which were obtained from an oil separator, was carried out by using sulfuric acid as the catalyst and esterification process. The main variables involved in the esterification process, including methanol/waste cooking oils ratio, amount of acid catalyst, reaction time, and reaction temperature, were analyzed. Because the waste cooking oils contain high free fatty acid above 65%, the esterification process has been preferred. Methanol was used as alcohol in this process because of its low cost, and sulfuric acid was preferred as the catalyst because it gives very high yields in alkyl esters. Experiments have been performed to determine optimum conditions for this esterification process in different molar ratios,...
The Influence of Diesel Fuel-biodiesel-ethanol-butanol Blends on the Performance and Emission Characteristics of a Diesel Engine
Resitoglu, Ibrahim Aslan | Sugözü, İlker
In this study, performance and exhaust emissions of a diesel engine fueled with Fuel A (60% diesel-30% biodiesel-5% ethanol-5% butanol) and Fuel B (40% diesel-50% biodiesel-5% ethanol-5% butanol) were investigated. The biodiesel produced from trap grease was obtained with an oil separator. Fuel A and Fuel B were tested in a single cylinder, four-stroke diesel engine at full load conditions. Compared with diesel fuel, the performance characteristics of blend fuels slightly deteriorated while the emission characteristics improved significantly. CO and HC emissions decreased by 87.01 and 87.50%, respectively.
Hydrogen applications in selective catalytic reduction of NOx emissions from diesel engines
Resitoglu, Ibrahim Aslan
Diesel engines have been considered as a major source in nitrogen oxide (NOx) formation worldwide. The widespread use of diesel engines in consequence of their low fuel consumption, high durability and efficiency increases NOx emissions day by day. NOx emissions from diesel engines cause unavoidable damage on environment and people health. Although so many technologies such as exhaust gas recirculation (EGR), lean burn combustion, electronic controlling fuel injection systems, etc. have been developed to control NOx emissions from diesel engines, they couldn't meet the desired reduction in NOx emissions. In any case, Selective Catalytic Reduction (SCR) as one of the most promising aftertreatment-emission control technologies is an effective solution in restriction of NOx emissions. Th...
Suppressing Calcium Deactivation in Selective Catalytic Reduction of NOx from Diesel Engines Using Antimony
Suppressing Calcium Deactivation in Selective Catalytic Reduction
Resitoglu, Ibrahim Aslan
The selective catalytic reduction (SCR) of NOx emissions by hydrocarbons (HCs) using a silver (Ag)-based catalyst offers significant advantages over conventional SCR systems that rely on ammonia reductants and vanadium-based catalysts. However, the conversion rate of SCR is influenced by several factors, among which catalyst poisoning is a major concern. Toxic metals such as sodium (Na), potassium (K), magnesium (Mg), and calcium (Ca) can degrade catalyst activity and lead to deactivation. Poisoned catalysts suffer from reduced conversion rates and premature deactivation before reaching their intended operational lifespan. In particular, calcium poisoning results in the formation of CaO (calcium oxide), which reacts to produce a CaWO4 compound that severely impairs SCR performance. This st...
Enhancing low-temperature ethanol-selective catalytic reduction over Ag/TiO2-cordierite catalysts via cerium addition
Enhancing low-temperature ethanol-selective catalytic reduction
Resitoglu, Ibrahim Aslan
The purpose of this study is to investigate the NOx reduction activity of Ag/TiO2-Cordierite catalysts enhanced with cerium (Ce) under varying operational temperatures and engine loads. The aim is to improve the low-temperature activity of the catalyst in an ethanol-selective catalytic reduction system using real exhaust gases. During the catalyst production process, Ag and Ce were used as active components, TiO2 as the secondary support material, and cordierite as the primary carrier structure material. Catalysts with 1 wt%, 3 wt%, and 5 wt% Ce-doped Ag/TiO2/Cordierite were synthesized using the washcoating method and characterized through X-Ray Diffraction, Brunauer-Emmett-Teller analysis, and Scanning Electron Microscopy (SEM). Performance test results demonstrated that the NOx conversi...