Chemical and Phase Composition and Surface Area of an Aluminomagnesium System
Научная публикация
| Общая информация |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Переводная
|
| Журнал |
Russian Chemical Bulletin
ISSN: 1066-5285
, E-ISSN: 1573-9171
|
| Вых. Данные |
Год: 1978,
Том: 27,
Номер: 5,
Страницы: 851-859
Страниц
: 9
DOI:
10.1007/BF00928978
|
| Ключевые слова |
Oxide; Precipitation; Particle Size; Hydrolysis; Magnesium |
| Авторы |
Dzisʹko V.A.
1
,
Ivanova A.S.
1
,
Plyasova L.M.
1
,
Ketchik S.V.
1
|
| Организации |
| 1 |
Institute of Catalysis, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk
|
|
Conclusions:
1. In an aluminomagnesium hydroxide system, the components reactwith one another even in the precipitation stage, with formation of two types of magnesium hydroxoaluminates.
2. The phase composition of the roasted specimens depends on the ratio of the concentrations of the Mg and Al oxides: Specimens containing less than 50 mole % of MgO are imperfect spinels, on increase in the MgO content the degree of imperfection decreases. When the MgO content is more than 50 mole %, a mixture of aluminomagnesium spinel and magnesium oxide is formed. The degree of ordering of the spinel depends on the preparation conditions, the roasting temperature, and the ratio of MgO to Al2O3 in the system.
3. The surface area depends on the composition, the depth of hydrolysis, and the roasting temperature. Above 700°C, on increase in the proportion of MgO the surface area decreases and the particle size increases. Extremal values of the surface area or particle size were notobserved for any composition of the specimens.