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

Date

2015-11-01

Author

Üner, Deniz
Tabari, Taymaz

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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).

Subject Keywords

Calorimetry, Relative humidity, Hydroxyl groups, Immobilized TiO2, Photocatalytic oxidation, Nitric oxide

URI

https://hdl.handle.net/11511/42056

Journal

APPLIED SURFACE SCIENCE

DOI

https://doi.org/10.1016/j.apsusc.2015.07.045

Collections

Department of Chemical Engineering, Article

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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.