Structure and Acid-Base Properties of Hexaaluminates
Научная публикация
| Общее |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
| Журнал |
Reaction Kinetics and Catalysis Letters
ISSN: 0133-1736
, E-ISSN: 1588-2837
|
| Вых. Данные |
Год: 2008,
Том: 93,
Номер: 2,
Страницы: 375-387
Страниц
: 13
DOI:
10.1007/s11144-008-5300-z
|
| Ключевые слова |
Acid-base properties, Hexaaluminate, XRD |
| Авторы |
Bukhtiyarova Marina V.
1
,
Ivanova Aleksandra S.
1
,
Plyasova Lyudmila M.
1
,
Litvak Galina S.
1
,
Budneva Anna A.
1
,
Paukshtis Evgenii A.
1
|
| Организации |
| 1 |
Boreskov Institute of Catalysis
|
|
Hexaaluminates SrAl12O19, BaAl12O19 and LaAl11O18 were prepared by co-precipitation of soluble nitrates of Sr, Ba, or La and Al using NH4HCO3 as a precipitating agent with subsequent calcination at 700–1400°C. The samples were characterized by adsorption methods, thermal analysis (TA and DTG), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectroscopy of adsorbed probe molecules (CO and CDCl3). It was shown that calcination at 1200°C resulted in the formation of single-phase hexaaluminates in all the samples except for LaAl11O18, where an additional phase was found. The specific surface area of the samples was obtained in the range 16–22 m2/g. After the treatment at comparable conditions, the total concentrations of both surface Lewis acid sites and basic sites were found to increase in the series: BaAl12O19 < SrAl12O19 < LaAl11O18. However, the strongest basic sites were detected on the surface of BaAl12O19.