Browsing by Author "Ates, Ayten"
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Abatement of nitrous oxide over natural and iron modified natural zeolites
Ates, Ayten; Reitzmann, Andreas; Hardacre, Christopher; Yalcin, Huseyin (ELSEVIER SCIENCE BV, 2011)The natural zeolite obtained from the Sivas-Yavu region in Turkey and iron modified forms were studied for the decomposition of N(2)O and selective catalytic reduction of N(2)O with NH(3). The natural and iron modified ... -
Adsorption and column flotation studies on talc using anionic and cationic collectors
Kursun, Hulya; Ates, Ayten (SPRINGER, 2010)Adsorption properties and column flotation were studied to investigate the interaction of the anionic and cationic collectors and flotation recoveries for talc mineral. Adsorption capacity is dependent on pH, adsorption ... -
Characteristics of Fe-exchanged natural zeolites for the decomposition of N2O and its selective. catalytic reduction with NH3
Ates, Ayten (ELSEVIER SCIENCE BV, 2007)Natural zeolites obtained from various regions of Turkey and their iron-exchanged forms were characterised by XRD, BET, H-2-TPR and NH3-TPD methods. Transient experiments with N2O showed that the iron introduced into natural ... -
Effect of alkali-treatment on the characteristics of natural zeolites with different compositions
Ates, Ayten (ACADEMIC PRESS INC ELSEVIER SCIENCE, 2018)A series of natural zeolites with different compositions were modified by post-synthesis modification with sodium hydroxide (NaOH) solution. Natural and modified zeolites were characterized by XRD, SEM, nitrogen adsorption, ... -
Effect of pre-treatment and modification conditions of natural zeolites on the decomposition and reduction of N2O
Ates, Ayten (SPRINGER, 2015)The decomposition of N2O and reduction of N2O with NH3 on natural and modified zeolites were studied by a steady state reaction. Two different natural zeolites having different phase compositions were modified by ion ... -
The effect of various treatment conditions on natural zeolites: Ion exchange, acidic, thermal and steam treatments
Ates, Ayten; Hardacre, Christopher (ACADEMIC PRESS INC ELSEVIER SCIENCE, 2012)Two different natural zeolites having different phase compositions were obtained from different regions of Turkey and modified by ion-exchange (0.5 M NH4NO3) and acid leaching using 1 M HCl. The natural and modified samples ... -
Experimental techniques for investigating the surface oxygen formation in the N2O decomposition on Fe-MFI zeolites
Ates, Ayten; Reitzmann, Andreas (ELSEVIER SCIENCE SA, 2007)Several experimental techniques were used to investigate the formation of surface oxygen in the N2O decomposition on an Fe-MFI zeolite. These techniques consisted of multipulse and step experiments as transient methods at ... -
Heavy metal removal from aqueous solution by Pseudevernia furfuracea (L.) Zopf
Ates, Ayten; Yildiz, Atilla; Yildiz, Nuray; Calimli, Ayla (WILEY-V C H VERLAG GMBH, 2007)The present study was carried out in a batch system using a lichen (Pseudevernia furfuracea (L.) Zopf) for the sorption of nickel(II) and copper(II) ions from water. Particularly, the effect of pH, contact time and temperature ... -
Influence of treatment conditions on decomposition activity of N2O over FeZSM-5 with high iron content
Ates, Ayten (ROYAL SOC CHEMISTRY, 2014)The influence of treatment on formation and activity of surface oxygen over FeZSM-5 with high iron content was studied by using a transient multipulse technique combined with temperature-programmed desorption (TPD) and ... -
The modification of aluminium content of natural zeolites with different composition
Ates, Ayten (ELSEVIER SCIENCE BV, 2019)A series of natural zeolites with different compositions were modified by formation of hydrated aluminium oxide onto the zeolite structure after NaOH treatment of the natural zeolites. Natural and modified zeolites were ... -
Modification of natural zeolite with NaOH for removal of manganese in drinking water
Ates, Ayten; Akgul, Gokcen (ELSEVIER SCIENCE BV, 2016)Natural zeolite (NZ) obtained from the Manisa-Demirci region of Turkey was modified by NaOH aqueous solutions (0.5-2.0 mol/dm(3)) and the adsorption capacity of natural and modified forms was determined for manganese ... -
Oxidative dehydrogenation of propane with N2O over Fe-ZSM-5 and Fe-SiO2: Influence of the iron species and acid sites
Ates, Ayten; Hardacre, Christopher; Goguet, Alexandre (ELSEVIER SCIENCE BV, 2012)A series of iron containing zeolites with varying Si/Al ratios (11.5-140) and low iron content (similar to 0.9 wt.% Fe) have been synthesised by solid-state ion exchange with commercially available zeolites and tested, for ... -
The role of catalyst in supercritical water desulfurization
Ates, Ayten; Azimi, Gisele; Choi, Ki-Hyouk; Green, William H.; Timko, Michael T. (ELSEVIER SCIENCE BV, 2014)We evaluated supercritical water (SCW) for sulfur removal from Arabian Heavy (AH) whole crude oil and two model feeds: hexyl sulfide (HS) in hexadecane (HD) and dibenzothiophene (DBT) in HD. We measured SCW desulfurization ... -
Role of Modification of Natural Zeolite in Removal of Arsenic from Aqueous Solutions
Ates, Ayten; Ozkan, Inci; Canbaz, Gamze Topal (SLOVENSKO KEMIJSKO DRUSTVO, 2018)The adsorption of arsenic from aqueous solution onto natural and modified zeolites was investigated. The natural zeolites were modified by ion-exchange (NH4NO3) and addition of aluminum (Al-2(SO4)(3)). The natural and ... -
Role of modification of natural zeolite in removal of manganese from aqueous solutions
Ates, Ayten (ELSEVIER SCIENCE BV, 2014)The natural zeolite (NZ) was obtained from Sivas-Yavu of Turkey and modified by ion-exchange (NH4NO3), alkali treatment (NaOH) and addition of aluminum (Al-2(SO4)(3)). The natural and modified samples were characterized ... -
Surface oxygen generated upon N2O activation on iron containing ZSM-5 type zeolites with different elemental composition
Ates, Ayten; Reitzmann, Andreas; Waters, Gerrit (ELSEVIER SCIENCE BV, 2012)Various ZSM-5 zeolites with iron contents ranging from of 0.86 to 4.98 and Si/Al ratios of 11.5-140 were prepared by solid-state ion exchange with FeCl2. The catalysts were characterised by XRD, H-2-TPR and NH3-TPD. The ... -
Synthesis and characterization of hybrid iron oxide silicates for selective removal of arsenic oxyanions from contaminated water
El-Moselhy, Medhat Mohamed; Ates, Ayten; Celebi, Ahmet (ACADEMIC PRESS INC ELSEVIER SCIENCE, 2017)A series of hybrid silicates containing iron oxides was synthesized by adding various amounts of iron into silica on the basis of using post precipitation mechanism from aqueous solutions in order to form hydrated iron ... -
Thin-Film Catalytic Coating of a Microreactor for Preferential CO Oxidation over Pt Catalysts
Ates, Ayten; Pfeifer, Peter; Goerke, Oliver (WILEY-V C H VERLAG GMBH, 2013)Different Pt-based catalyst layers have been prepared and tested in a stacked foil microreactor for CO oxidation and preferential oxidation of CO in presence of hydrogen. The reactions were performed on Pt without support ...