Reduction of Mixed Mn–Zr Oxides: In situ XPS and XRD Studies | Sciact - CRIS-система Института катализа

Reduction of Mixed Mn–Zr Oxides: In situ XPS and XRD Studies Научная публикация

Журнал

Dalton Transactions
ISSN: 1477-9226 , E-ISSN: 1477-9234

Вых. Данные

Год: 2015, Том: 44, Номер: 35, Страницы: 15499-15507 Страниц : 9 DOI: 10.1039/C5DT01440A

Ключевые слова

RAY PHOTOELECTRON-SPECTROSCOPY; PHOTOIONIZATION CROSS-SECTIONS; THERMAL-STABILITY; TOTAL OXIDATION; CATALYSTS; ZIRCONIA; METHANE; TRANSITION; DIFFRACTION; EVOLUTION

Авторы

Bulavchenko O.A. ^1,2 , Vinokurov Z.S. ^1,2 , Afonasenko T.N. ³ , Tsyrulʹnikov P.G. ³ , Tsybulya S.V. ^1,2 , Saraev A.A. ^1,2 , Kaichev V.V. ^1,2

Организации

1	Novosibirsk State University, Pirogova Str. 2, 630090 Novosibirsk, Russia
2	Boreskov Institute of Catalysis SB RAS, Lavrentieva Ave. 5, 630090 Novosibirsk, Russia
3	Institute of Hydrocarbon Processing SB RAS, Neftezavodskaya Str. 54, 644040 Omsk, Russia

Информация о финансировании (1)

Российский научный фонд

14-23-00037

A series of mixed Mn–Zr oxides with different molar ratios Mn/Zr (0.1–9) have been prepared by coprecipitation of manganese and zirconium nitrates and characterized by X-ray diffraction (XRD) and BET methods. It has been found that at concentrations of Mn below 30 at%, the samples are single-phase solid solutions (MnxZr1−xO2−δ) based on a ZrO2 structure. X-ray photoelectron spectroscopy (XPS) measurements showed that manganese in these solutions exists mainly in the Mn4+ state on the surface. An increase in Mn content mostly leads to an increase in the number of Mn cations in the structure of solid solutions; however, a part of the manganese cations form Mn2O3 and Mn3O4 in the crystalline and amorphous states. The reduction of these oxides with hydrogen was studied by a temperature-programmed reduction technique, in situ XRD, and near ambient pressure XPS in the temperature range from 100 to 650 °C. It was shown that the reduction of the solid solutions MnxZr1−xO2−δ proceeds via two stages. During the first stage, at temperatures between 100 and 500 °C, the Mn cations incorporated into the solid solutions MnxZr1−xO2−δ undergo partial reduction. During the second stage, at temperatures between 500 and 700 °C, Mn cations segregate on the surface of the solid solution. In the samples with more than 30 at% Mn, the reduction of manganese oxides was observed: Mn2O3 → Mn3O4 → MnO.

Bulavchenko O.A. , Vinokurov Z.S. , Afonasenko T.N. , Tsyrulʹnikov P.G. , Tsybulya S.V. , Saraev A.A. , Kaichev V.V.
Reduction of Mixed Mn–Zr Oxides: In situ XPS and XRD Studies

Dalton Transactions. 2015. V.44. N35. P.15499-15507. DOI: 10.1039/C5DT01440A WOS Scopus РИНЦ CAPlusCA OpenAlex

Полный текст от издателя

Поступила в редакцию:	16 апр. 2015 г.
Принята к публикации:	22 июл. 2015 г.
Опубликована в печати:	22 июл. 2015 г.
Опубликована online:	22 июл. 2015 г.

Web of science:	WOS:000360452600022
Scopus:	2-s2.0-84940398918
РИНЦ:	24944125
Chemical Abstracts:	2015:1209556
Chemical Abstracts (print):	163:311446
OpenAlex:	W2162733257

БД	Цитирований
Web of science	102
Scopus	105
РИНЦ	104
OpenAlex	110