Investigation of the thermal decomposition of a new titanium dioxide material: TA/MS and EPR study

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Investigation of the thermal decomposition of a new titanium dioxide material: TA/MS and EPR study

Popis výsledku v původním jazyce

A new type of TiO2 material has been prepared from titanium(IV) oxysulfate via precipitation by cold ammonia solution and drying at room temperature. The structure remains unchanged during the preparation (controlled hydrolysis), and titania material with a similar rod-shaped structure is created. The decomposition process has been evaluated by TA/MS analysis as a three-step process. The first step was characterized by water and carbon dioxide loss, the second step is represented by the evolution of residual water and ammonia, and the third step is represented by a very sharp exothermic peak due to the phase transition (crystallization of amorphous phase to anatase) together with a small mass loss caused by evolution of oxygen and nitrous oxide. EPR spectra obtained in the temperature range 100?250 K confirmed the presence of Ti(III) ions and oxygen vacancies for the TiO2 precursor annealed up to 550 °C in a vacuum. Annealing to 500 °C resulted in the generation of paramagnetic Ti(III) centers and nitrogen species (?Nb and NO) in anatase lattice.

Název v anglickém jazyce

Investigation of the thermal decomposition of a new titanium dioxide material: TA/MS and EPR study

Popis výsledku anglicky

A new type of TiO2 material has been prepared from titanium(IV) oxysulfate via precipitation by cold ammonia solution and drying at room temperature. The structure remains unchanged during the preparation (controlled hydrolysis), and titania material with a similar rod-shaped structure is created. The decomposition process has been evaluated by TA/MS analysis as a three-step process. The first step was characterized by water and carbon dioxide loss, the second step is represented by the evolution of residual water and ammonia, and the third step is represented by a very sharp exothermic peak due to the phase transition (crystallization of amorphous phase to anatase) together with a small mass loss caused by evolution of oxygen and nitrous oxide. EPR spectra obtained in the temperature range 100?250 K confirmed the presence of Ti(III) ions and oxygen vacancies for the TiO2 precursor annealed up to 550 °C in a vacuum. Annealing to 500 °C resulted in the generation of paramagnetic Ti(III) centers and nitrogen species (?Nb and NO) in anatase lattice.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CA - Anorganická chemie

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Thermal Analysis and Calorimetry

ISSN

1388-6150

e-ISSN

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Svazek periodika

125

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

1071-1078

Kód UT WoS článku

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EID výsledku v databázi Scopus

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