The influence of relative humidity on photocatalytic oxidation of nitric oxide (NO) over TiO2

2015-11-01
Üner, Deniz
Tabari, Taymaz
The influence of relative humidity on NO oxidation over commercial TiO2 (47 m(2)/g catalyst) was investigated. The experimental methodology followed the protocols described in ISO-22197: 2007 (E) standard. The adsorption characteristics of oxygen and H2O were monitored by adsorption calorimetry. Oxygen adsorption was low; on the contrary water vapor exhibited the characteristics of multilayer adsorption. In the first monolayer, the heats of adsorption of water sharply decreased from 180 to 80 kj/mol till about 10 mu mol/g catalyst surface coverage. Constant adsorption heats of about 80 kJ/mol were measured for coverage of about 350 mu mol/g catalyst, corresponding to a monolayer. Adsorption further continued with a constant heat of about 40 kJ/mol corresponding to the condensation enthalpy of water at the measurement temperature of 50 degrees C. The photocatalytic NO oxidation rate expression was determined as No-r alpha cN(NO)(-00.12) c(H2O)(0.38).
APPLIED SURFACE SCIENCE

Suggestions

The effects of metallic catalysts on light crude oil oxidation in limestone medium
Celebioglu, D; Bağcı, Ali Suat (2002-08-20)
In this study, 28 experiments were performed to study the effects of metallic additives on light crude oil oxidation in limestone medium. Karakus and Beykan crude oils from Turkish oil fields were used. The metallic additives were ferric chloride (FeCl3) copper chloride (CuCl) and magnesium chloride (MgCl(2)(.)6H(2)O). The mixture of aqueous solutions of three metallic salts with limestone and the crude oils was subjected to a controlled heating schedule under a constant flow rate of air. The produced gas w...
The effect of soluble boron on the burnup at different enrichments and assemblies
Gündüz, Güngör; Ajwah, Yousef (Elsevier BV, 1989-5)
The effect of boron on the optimum burnup was investigated at different assemblies for enriched fuels. As the enrichment increases, an alteration in the assembly type is needed for the optimum specific power. This alteration can be made at lower enrichments due to the presence of boron. The optimum specific power is shifted toward the high enrichment fuels when the assembly number is increased. If a fuel of high enrichment is first burnt in a highly hardened neutron spectrum and later in a softer spectrum t...
The deactivation behavior of the TiO2 used as a photo-catalyst for benzene oxidation
Üner, Deniz (1999-01-01)
In this study, the deactivation behavior of TiO2 as a photocatalyst for benzene decomposition to carbon dioxide and water was investigated. The effect of space time on the benzene and carbon dioxide conversions were monitored. Benzene conversion and carbon dioxide production rates were not correlated, indicating accumulation of a carbon containing intermediate on the surface. This intermediate was blocking the active sites at a stiochiometry of 1 C:1 site. High space times favored the production of carbon d...
The Role of precious metal nanoparticles on the oxygen exchange kinetics from ceria
Kaya, Deniz; Üner, Deniz; Kıncal, Serkan; Department of Chemical Engineering (2016)
The oxygen exchange kinetics of precious metal added ceria and ceria-alumina oxides were investigated by temperature programmed analyses and microcalorimetric measurements. 1 wt. % Pd/CeO2 and 1 wt. % Pd/Al2O3 oxides were synthesized by the incipient wetness method. 1 wt. % Pd/CeO2-Al2O3 oxides with 20 wt. %, 15 wt. % and 10 wt. % loadings of ceria were synthesized by the sequential impregnation method. Temperature programmed reduction (TPR) analysis was performed to analyze the reducibility of prepared oxi...
The effect of acquired salivary pellicle on the surface free energy and wettability of different denture base materials
Sipahi, C; Anil, N; Bayramlı, Erdal (Elsevier BV, 2001-03-01)
Objective: The objective of the present study was to evaluate the effect of salivary coating on the wettability and surface free energy of different denture base materials.
Citation Formats
D. Üner and T. Tabari, “The influence of relative humidity on photocatalytic oxidation of nitric oxide (NO) over TiO2,” APPLIED SURFACE SCIENCE, pp. 260–266, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42056.