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Prof. Semih Eser
Pennsylvania State University, University Park, United States

Basic Info

Basic Info is private.

Research Keywords & Expertise

0 Carbon materials from petroleum and coal
0 Undesirable carbon deposition in engine fuel and lubrication systems and in process units Preparation of activated carbons
0 Preparation of activated carbons
0 Upgrading petroleum residua
0 Catalytic oxidation of solid carbons

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Journal article
Published: 28 June 2020 in Carbon
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A series of carbon materials and composites has been characterized by temperature-programmed oxidation (TPO), polarized light microscopy (PLM), scanning electron microscopy with energy dispersive X-ray spectroscopy (EDS), and temperature-programmed desorption coupled with mass-spectrometry analysis. For materials containing anisotropic carbons, a consistent relationship was found between oxidation reactivity and optical texture. Polarized-light microscopy in combination with TPO can help assessing the relationships between oxidation reactivity and optical texture of anisotropic carbons. Deconvolution of TPO profiles and PLM observations can effectively identify the individual components of multi-component carbon materials with important implications in structure-property relationships and their applications. For amorphous carbons with isotropic optical textures, TPO profiles were found to be influenced by the surface chemistry of the materials. It appears that the TPO technique under controlled conditions provides a rapid analysis of solids carbons with respect to their structure and properties. This is particularly useful for the analysis of carbon composites with multiple phases in combination with microscopic examination and elemental analysis using EDS.

ACS Style

Sara Andreoli; Semih Eser. Relating reactivity to structure in cokes and carbon materials: Temperature-programmed oxidation and microscopy techniques. Carbon 2020, 168, 362 -371.

AMA Style

Sara Andreoli, Semih Eser. Relating reactivity to structure in cokes and carbon materials: Temperature-programmed oxidation and microscopy techniques. Carbon. 2020; 168 ():362-371.

Chicago/Turabian Style

Sara Andreoli; Semih Eser. 2020. "Relating reactivity to structure in cokes and carbon materials: Temperature-programmed oxidation and microscopy techniques." Carbon 168, no. : 362-371.

Research article
Published: 29 September 2016 in Energy & Fuels
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Two decant oils with different sulfur contents and their vacuum distillation fractions were hydrotreated in a fixed-bed flow reactor to produce a feed with sufficiently low sulfur content for needle coke production. Products from hydrotreatment were subsequently carbonized in a tubing bomb reactor to characterize the carbonaceous mesophase development seen in the resulting semicoke. Although the purpose of the hydrotreatment is to reduce sulfur content, hydrogenation of aromatic compounds also takes place during the treatment, thus increasing the hydrogen consumption. Modest hydrogenation of decant oil from the hydrotreatment improved the mesophase development but resulted in a significant decrease of the semicoke yield upon carbonization of the treated product. As a remedy to conserve hydrogen during hydrotreatment and achieve higher coke yields in the subsequent carbonization, only the middle fraction from vacuum distillation of the decant oil was hydrotreated and blended back with the vacuum bottoms to simulate the coker feed. This scheme was successful to attain the desirable sulfur reduction in the feedstock without the penalty of a reduced coke yield upon carbonization or useless hydrogen consumption.

ACS Style

Joseph P. Abrahamson; Ronald T. Wincek; Semih Eser. Scheme for Hydrotreatment of Fluid Catalytic Cracking Decant Oil with Reduced Hydrogen Consumption and High Needle Coke Yield upon Carbonization. Energy & Fuels 2016, 30, 8150 -8155.

AMA Style

Joseph P. Abrahamson, Ronald T. Wincek, Semih Eser. Scheme for Hydrotreatment of Fluid Catalytic Cracking Decant Oil with Reduced Hydrogen Consumption and High Needle Coke Yield upon Carbonization. Energy & Fuels. 2016; 30 (10):8150-8155.

Chicago/Turabian Style

Joseph P. Abrahamson; Ronald T. Wincek; Semih Eser. 2016. "Scheme for Hydrotreatment of Fluid Catalytic Cracking Decant Oil with Reduced Hydrogen Consumption and High Needle Coke Yield upon Carbonization." Energy & Fuels 30, no. 10: 8150-8155.

Research article
Published: 11 August 2016 in Energy & Fuels
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Removing sulfur from larger ring systems in fluid catalytic cracking decant oils used as needle coke feedstock is the most effective way of reducing the needle coke sulfur content. The large sulfur compounds found in decant oil are incorporated into coke in larger proportions than smaller sulfur compounds upon carbonization. The desirable outcome of decant oil hydrodesulfurization is, therefore, removing sulfur selectively from large polyaromatic ring systems with minimum hydrogen consumption. This study investigates the effects of catalyst properties on hydrodesulfurization activity to remove sulfur from decant oils. Two decant oils (DO-HS and DO-LS) representing a high (2.5 wt %) and low (0.9 wt %) sulfur content decant oil and their vacuum distillation fractions were hydrotreated in a fixed-bed flow reactor. Four catalysts (with varying average pore sizes, promoter atoms, and supports) were prepared with sequential incipient wetness impregnation to evaluate their activities for hydrodesulfurization and hydrogenation of decant oils. An increase in the average pore diameter from 7 to 14 nm for CoMo catalysts supported on Al2O3 proved capable of meeting the desired requirements for hydrodesulfurization of decant oil used in needle coke production. Of the four catalysts evaluated, CoMo supported on TiO2 outperformed the other three catalysts supported on Al2O3; however, focus was placed on the Al2O3-supported catalysts as a result of the superior mechanical integrity and proven longevity of Al2O3 in hydrodesulfurization reactors. It was shown by proton nuclear magnetic resonance that promoting Mo supported on Al2O3 with Ni instead of Co results in equivalent hydrogenation activity and decreased desulfurization. Upon carbonization of treated oils, the sulfur content of the resulting coke increased from the feed treated with a CoMo catalyst supported on Al2O3 with an average pore diameter of 7 nm, whereas coke produced from feeds treated over the CoMo catalyst supported on Al2O3 with an average pore diameter of 14 nm had a lower sulfur content compared to the feed. Therefore, with a proper catalyst design, sulfur in decant oil that tends to be retained in the coke can selectively be removed. Thus, hydrodesulfurization can favor the direct desulfurization route over the hydrogenation route by employing high reaction temperatures and modest hydrogen pressures.

ACS Style

Joseph P. Abrahamson; Ronald T. Wincek; Semih Eser. Effects of Catalyst Properties on Hydrodesulfurization Activity for Sulfur Removal from Fluid Catalytic Cracking Decant Oils. Energy & Fuels 2016, 30, 7173 -7179.

AMA Style

Joseph P. Abrahamson, Ronald T. Wincek, Semih Eser. Effects of Catalyst Properties on Hydrodesulfurization Activity for Sulfur Removal from Fluid Catalytic Cracking Decant Oils. Energy & Fuels. 2016; 30 (9):7173-7179.

Chicago/Turabian Style

Joseph P. Abrahamson; Ronald T. Wincek; Semih Eser. 2016. "Effects of Catalyst Properties on Hydrodesulfurization Activity for Sulfur Removal from Fluid Catalytic Cracking Decant Oils." Energy & Fuels 30, no. 9: 7173-7179.

Research article
Published: 15 July 2016 in Energy & Fuels
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ACS Style

Ronald T. Wincek; Joseph P. Abrahamson; Semih Eser. Hydrodesulfurization of Fluid Catalytic Cracking Decant Oils in a Laboratory Flow Reactor and Effect of Hydrodesulfurization on Subsequent Coking. Energy & Fuels 2016, 30, 6281 -6289.

AMA Style

Ronald T. Wincek, Joseph P. Abrahamson, Semih Eser. Hydrodesulfurization of Fluid Catalytic Cracking Decant Oils in a Laboratory Flow Reactor and Effect of Hydrodesulfurization on Subsequent Coking. Energy & Fuels. 2016; 30 (8):6281-6289.

Chicago/Turabian Style

Ronald T. Wincek; Joseph P. Abrahamson; Semih Eser. 2016. "Hydrodesulfurization of Fluid Catalytic Cracking Decant Oils in a Laboratory Flow Reactor and Effect of Hydrodesulfurization on Subsequent Coking." Energy & Fuels 30, no. 8: 6281-6289.

Journal article
Published: 17 December 2008 in Chemistry Central Journal
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Solid deposits from commercially available high-pressure diesel injectors (HPDI) were analyzed to study the solid deposition from diesel fuel during engine operation. The structural and chemical properties of injector deposits were compared to those formed from the thermal oxidative stressing of a diesel fuel range model compound, n-hexadecane at 160 degrees C and 450 psi for 2.5 h in a flow reactor. Both deposits consist of polyaromatic compounds (PAH) with oxygen moieties. The similarities in structure and composition of the injector deposits and n-hexadecane deposits suggest that laboratory experiments can simulate thermal oxidative degradation of diesel in commercial injectors. The formation of PAH from n-hexadecane showed that aromatization of straight chain alkanes and polycondensation of aromatic rings was possible at temperatures as low as 160 degrees C in the presence of oxygen. A mechanism for an oxygen-assisted aromatization of cylcoalkanes is proposed.

ACS Style

Ramya Venkataraman; Semih Eser. Characterization of deposits formed on diesel injectors in field test and from thermal oxidative degradation of n-hexadecane in a laboratory reactor. Chemistry Central Journal 2008, 2, 25 -25.

AMA Style

Ramya Venkataraman, Semih Eser. Characterization of deposits formed on diesel injectors in field test and from thermal oxidative degradation of n-hexadecane in a laboratory reactor. Chemistry Central Journal. 2008; 2 (1):25-25.

Chicago/Turabian Style

Ramya Venkataraman; Semih Eser. 2008. "Characterization of deposits formed on diesel injectors in field test and from thermal oxidative degradation of n-hexadecane in a laboratory reactor." Chemistry Central Journal 2, no. 1: 25-25.

Research article
Published: 03 December 2008 in Industrial & Engineering Chemistry Research
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Reaction of the organic sulfur compounds in Jet A with Fe- and Ni-based alloy substrates under pyrolytic conditions formed significant amounts of metal sulfides. Pyrrhotite (Fe(1−x)S) and heazlewoodite (Ni3S2) were formed on SS316 and Inconel 600 surfaces, respectively, in the short duration experiments. After extended periods of thermal stressing, an additional crystal phase, pentlandite (Fe,Ni)9S8, was also observed on both surfaces. The lack of FeS2 (pyrite) formation over extended periods of stressing indicates that the amount of sulfur reacting with the substrates decreased with the increasing thermal stressing time. A focused ion beam (FIB)/SEM analysis showed that the metal sulfide formation can extend up to 2 μm depth from the surface in 2 h of thermal stressing. The formation of metal sulfides on alloy surfaces degrades the alloy surfaces and affects solid carbon deposition from jet fuel.

ACS Style

Ramya Venkataraman; Semih Eser. Characterization of Solid Deposits Formed from Jet Fuel Degradation under Pyrolytic Conditions: Metal Sulfides. Industrial & Engineering Chemistry Research 2008, 47, 9351 -9360.

AMA Style

Ramya Venkataraman, Semih Eser. Characterization of Solid Deposits Formed from Jet Fuel Degradation under Pyrolytic Conditions: Metal Sulfides. Industrial & Engineering Chemistry Research. 2008; 47 (23):9351-9360.

Chicago/Turabian Style

Ramya Venkataraman; Semih Eser. 2008. "Characterization of Solid Deposits Formed from Jet Fuel Degradation under Pyrolytic Conditions: Metal Sulfides." Industrial & Engineering Chemistry Research 47, no. 23: 9351-9360.