Browsing by Author "Tonbul, Yalcin"
Now showing items 1-16 of 16
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Catalytic properties of heteropoly acid H3PW12O40 supported-on Turkish bentonite
Tonbul, Yalcin; Hosgoren, Halil (Asian Journal Of Chemistry, 2008)Catalysts based on tungstophosphoric acid on Turkish bentonite were obtained. The influence of the heteropoly acid content, in five different concentrations, was studied. The catalysts have been characterized using gas ... -
Ceria supported rhodium nanoparticles: Superb catalytic activity in hydrogen generation from the hydrolysis of ammonia borane
Akbayrak, Serdar; Tonbul, Yalcin; Ozkar, Saim (Elsevier Science Bv, 2016)We investigated the effect of various oxide supports on the catalytic activity of rhodium nanoparticles in hydrogen generation from the hydrolysis of ammonia borane. Among the oxide supports (CeO2, SiO2, Al2O3, TiO2, ZrO2, ... -
Ceria-supported ruthenium nanoparticles as highly active and long-lived catalysts in hydrogen generation from the hydrolysis of ammonia borane
Akbayrak, Serdar; Tonbul, Yalcin; Ozkar, Saim (Royal Soc Chemistry, 2016)Ruthenium(0) nanoparticles supported on ceria (Ru-0/CeO2) were in situ generated from the reduction of ruthenium(III) ions impregnated on ceria during the hydrolysis of ammonia borane. Ru-0/CeO2 was isolated from the ... -
Comparison of the biodiesel quality produced from refined sunflower (Helianthus annuus L) oil and waste cooking oil
Saydut, Abdurrahman; Kafadar, Aylin Beycar; Tonbul, Yalcin; Kaya, Canan; Aydin, Firat; Hamamci, Candan (Multi-Science Publ Co Ltd, 2010)A major hurdle in commercialization of biodiesel from vegetable oil, in comparison to petroleum-based diesel fuel, is its cost of manufacturing, primarily the raw material cost. Waste cooking oil is one of the economical ... -
Froth flotation pretreatment for enhancing desulfurization of coal with sodium hydroxide
Saydut, Abdurrahman; Tonbul, Yalcin; Baysal, Akin; Zahir Duz, M.; Hamamci, Candan (Natl Inst Science Communication, 2007)Froth flotation (FF) pretreatment of coal from Hazro, Turkey, for enhancing desulfurization with sodium hydroxide was investigated. FF reduced following contents of coal: ash, 58.54; pyritic sulfur, 79.34; and volatile ... -
Group 4 oxides supported Rhodium(0) catalysts in hydrolytic dehydrogenation of ammonia borane
Tonbul, Yalcin; Akbayrak, Serdar; Ozkar, Saim (Pergamon-Elsevier Science Ltd, 2019)Rh3+ ions are first impregnated on Group 4 metal oxides (TiO2, ZrO2, HfO2) in aqueous solution and, then reduced with aqueous solution of NaBH4 to form rhodium(0) nanoparticles (NPs) on the oxide surface. The analyses ... -
Iridium(O) nanoparticles dispersed in zeolite framework: A highly active and long-lived green nanocatalyst for-the hydrogenation of neat aromatics at room temperature
Tonbul, Yalcin; Zahmakiran, Mehmet; Ozkar, Saim (Elsevier, 2014)The complete hydrogenation of aromatic molecules is one of the key transformation employed in the synthetic and petroleum chemistry. Described herein is a new catalytic nanomaterial for the hydrogenation of neat aromatics ... -
Liquefaction of Harbul (Silopi SE anatolia, turkey) asphaltite by flash pyrolysis
Saydut, Abdurrahman; Tonbul, Yalcin; Hamamci, Candan (Sage Publications Inc, 2008)Asphaltite, being petroleum originated solid fossil fuel, can be converted into a variety of secondary products such as light hydrocarbon gases, liquid product and high quality fuel char by means of pyrolysis. Liquefaction ... -
Magnetically Separable Rh0/Co3O4 Nanocatalyst Provides over a Million Turnovers in Hydrogen Release from Ammonia Borane
Akbayrak, Serdar; Tonbul, Yalcin; Ozkar, Saim (Amer Chemical Soc, 2020)Cobalt(II,III) oxide nanopowders are used as supporting materials for rhodium(0) nanoparticles forming Rh-0/Co3O4 nanocatalysts, which can be prepared by impregnation and sodium borohydride reduction of Rh3+ ions on the ... -
Magnetically separable rhodium nanoparticles as catalysts for releasing hydrogen from the hydrolysis of ammonia borane
Tonbul, Yalcin; Akbayrak, Serdar; Ozkar, Saim (Academic Press Inc Elsevier Science, 2019)Magnetically separable catalysts attract considerable attention in catalysis due to their facile separation from the reaction medium. This propensity is crucial for efficient multiple use of precious noble metal nanoparticles ... -
Nanoceria supported palladium(0) nanoparticles: Superb catalyst in dehydrogenation of formic acid at room temperature
Akbayrak, Serdar; Tonbul, Yalcin; Ozkar, Saim (Elsevier Science Bv, 2017)Highly efficient dehydrogenation of formic acid (FA) at room temperature was achieved using palladium(0) nanoparticles supported on nanoceria (Pd-0/CeO2) as catalysts. Pd-0/CeO2 was prepared by impregnation of palladium(II) ... -
Nanozirconia supported ruthenium(0) nanoparticles: Highly active and reusable catalyst in hydrolytic dehydrogenation of ammonia borane
Tonbul, Yalcin; Akbayrak, Serdar; Ozkar, Saim (Academic Press Inc Elsevier Science, 2018)Nanozirconia supported ruthenium(0) nanoparticles (Ru-0/ZrO2) were prepared by impregnation of ruthenium(III) cations on the surface of zirconia followed by their reduction with sodium borohydride at room temperature. ... -
Palladium(0) nanoparticles supported on ceria: Highly active and reusable catalyst in hydrogen generation from the hydrolysis of ammonia borane
Tonbul, Yalcin; Akbayrak, Serdar; Ozkar, Saim (Pergamon-Elsevier Science Ltd, 2016)Palladium(0) nanoparticles supported on nanoceria (Pd-0/CeO2) were prepared by the impregnation of palladium(II) ions on the surface of ceria followed by their reduction with sodium borohydride in aqueous solution at room ... -
Preparation and characterization of Cr- and Fe-pillared bentonites by using CrCl3, FeCl3, Cr(acaC)3 and Fe(acac)3 as precursors
Yurdakoc, Mueruevvet; Akcay, Mehmet; Tonbul, Yalcin; Ok, Fatih; Yurdakoc, Kadir (Elsevier, 2008)Four pillared bentonites (Cr-PILB, Cr(acaC)(3)-PILB, Fe-PILB and Fe(acaC)(3)-PILB were prepared and characterized by X-ray diffraction (XRD), nitrogen sorption measurements and thermogravimetric (TG) analysis. The surface ... -
Reducible tungsten(VI) oxide-supported ruthenium(0) nanoparticles: highly active catalyst for hydrolytic dehydrogenation of ammonia borane
Akbayrak, Serdar; Tonbul, Yalcin; Ozkar, Saim (Tubitak Scientific & Technological Research Council Turkey, 2023)Reducible WO3 powder with a mean diameter of 100 nm is used as support to stabilize ruthenium(0) nanoparticles. Ruthenium(0) nanoparticles are obtained by NaBH4 reduction of ruthenium(III) precursor on the surface of WO3 ... -
Separation of liquid fractions obtained from flash pyrolysis of asphaltite
Saydut, Abdurrahman; Duz, M. Zahir; Tonbul, Yalcin; Baysal, Akin; Hamamci, Candan (Elsevier, 2008)The experiments on the flash pyrolysis of asphaltite (Avgamasya, Sirnak, SE Anatolia, Turkey) were carried out in a fixed bed reactor as a basic study. The investigation focused on the effects of pyrolysis temperature and ...
