Optimum calcination temperature in the synthesis of a N-C-S co-doped TiO2 photocatalyst, as monitored by neutron diffraction

6th Meeting of the Spanish Neutron Scattering Association

Rozas, Francisco^1 ; Bengtsson, Nicklas^1 ; Fabelo, Oscar^2 ; Puente, Inés^2 ; Castellote, Marta^1

Institute of Construction Science Eduardo Torroja (IETcc-CSIC), Serrano Galvache 4, Madrid

28033, Spain^1

Institut Laue-Langevin BP 156 6, rue Jules Horowitz, Grenoble cedex 9

38042, France^2

关键词: Calcination temperature;    Crystalline phase;    Crystalline phasis;    Electromagnetic spectra;    Heating ramps;    Optimum temperature;    TiO2 photocatalyst;    Whole process;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/549/1/012026/pdf
DOI  :  10.1088/1742-6596/549/1/012026

来源: IOP

【 摘 要 】

Calcination of a co-doped (N-C-S) TiO2photocatalyst has been done following the whole process by neutron diffraction (instrument D1B of the ILL) with the objective of study the transition between two crystalline phases: anatase and rutile in order to find the optimum temperature leading to the coexistence of both for this catalyst whose band gap has been shifted to give activity in the visible part of the electromagnetic spectrum. This coexistence is important as it has been established that these catalyst are more efficient than those having only one individual phase. At this respect, it is very important to find the optimum temperature at with synthesis has to be done. In this research it was established that at the heating ramp of 17°C/5 min, the coexistence of both crystalline phases took place within a narrow margin of temperatures between 610°C and 690°C. At higher temperatures only rutile can be identified as the crystalline phase of the TiO2.