Deniz Üner

E-mail

uner@metu.edu.tr

Department

Department of Chemical Engineering

ORCID

0000-0001-8585-3691

Scopus Author ID

6603719926

Web of Science Researcher ID

P-5819-2015

Tracking the Mode of Carbon Deposition During Dry Reforming of Methane over Ni/γ-Al2O3 Ay, Hale; Mao, Haiyan; Xu, Jun; Reimer, Jefferey A.; Üner, Deniz (2025-01-01) Dry reforming of methane was studied over Ni/Al2O3 catalyst at 600 °C with varying CO2/CH4 ratios (0.2, 0.5, 1, 2, 5). 13CO2 as well as 12CO2 were used along with 12CH4 and resulting carbon was characterized with 13C solid...
LaCoO3 is a promising catalyst for the dry reforming of benzene used as a surrogate of biomass tar Çağlar, Başar; Üner, Deniz (2024-01-01) Tar build-up is one of the bottlenecks of biomass gasification processes. Dry reforming of tar is an alternative solution if the oxygen chemical potential on the catalyst surface is at a sufficient level. For this purpose,...
Dissociation of HNO3 in water revisited: experiment and theory Munar, Ipek; Özer, Melike Özkan; Fusco, Edoardo; Üner, Deniz; Aviyente, Viktorya; Bühl, Michael (2024-01-01) Nitric acid dissociation in water is studied as a function of concentration, employing experimental techniques (1H NMR spectroscopy and calorimetry), quantum chemical methods (B3LYP and PBE functionals for molecular cluste...
Effects of dead volume and inert sweep gas flow on photocatalytic hydrogen evolution over Pt/TiO2 Can Özcan, Elif; Üner, Deniz; Yildirim, Ramazan (2024-01-01) In this study, the effects of dead volume and sweep gas flow rate on photocatalytic hydrogen production over Pt/TiO2 were examined to determine their possible impact on hydrogen production rates. Five different dead volume...
PdH α-phase is associated with residual oxygen as revealed by in situ 1H NMR measurements and DFT-NMR estimations Mete, Ersen; Yılmaz, Begüm; Üner, Deniz (2023-12-30) An experimental and DFT study was conducted to investigate the chemical nature of α and β PdH phases in Pd/TiO2 through the detailed analysis of their 1H NMR chemical shifts. α-PdH states are identified with shielded 1H NM...
NMR spektroskopisi ile katalizör katakterizasyonu çalışmaları Üner, Deniz (2023-09-11)
Pd as a reduction promoter for TiO2: Oxygen and hydrogen transport at 2D and 3D Pd interfaces with TiO2 monitored by TPR, operando 1H NMR and CO oxidation studies Yarar, Melis; Bouzani, Asmae; Üner, Deniz (2023-01-01) Ambient temperature reduction of TiO2 surface was observed through hydrogen spillover from Pd nanoparticles with a hydrogen consumption stoichiometry of 1.4 H2:Pd up to ≤2 wt%Pd loading. This behavior was attributed to the...
Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements Ernam, Selin; Akgül, Zeynep Ece; Üner, Deniz (2023-01-01) The photocatalytic nitric oxide (NO) oxidation reaction is used as a standard diagnostic tool for photocatalytic activity according to the well-defined protocol described by ISO Standard 22197-1-2007. This protocol identif...
Elucidating the role of adsorption during artificial photosynthesis: H2O and CO2 adsorption isotherms over TiO2 reveal thermal effects under UV illumination Üner, Deniz; Yılmaz, Begüm (2022-06-01) Adsorption measurements of CO2 and H2O over TiO2 surfaces in dark and under illumination were carried out to reveal the ensuing bottlenecks of the initial steps of the artificial photosynthesis reaction. When the adsorptio...
Oxygen vacancies on Pd/TiO2 are detected at low pressures by ESR spectroscopy at ambient temperatures Üner, Deniz; Yarar, Melis (2022-1-01) All rights reserved.A low field benchtop electron spin resonance (ESR) (also referred to as electron paramagnetic resonance (EPR)) spectrometer is used to reveal paramagnetic centres such as oxygen vacancies and Ti+3 centr...

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