NDLI: Preparation and characterization of spherical mesoporous ZrO$_{2}$-Al$_{2}$O$_{3}$ composites with high thermal stability

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Preparation and characterization of spherical mesoporous ZrO$_{2}$-Al$_{2}$O$_{3}$ composites with high thermal stability

Content Provider	Springer Nature Link
Author	Li, Yang Feng, JunTing Li, DianQing
Copyright Year	2011
Abstract	Spherical mesoporous ZrO$_{2}$-Al$_{2}$O$_{3}$ composites containing different zirconia content have been synthesized by an oil-column sol-gel method. A mixed alumina-zirconia hydrosol and hexamethylenetetramine solution were mixed together and added dropwise into a hot oil column. Due to the surface tension, spherical gel particles were formed in the oil column. The spherical gel particles were then aged and washed by deionized water and dried at 120 °C for 12 h and then calcined at 600 °C for 8 h, 960 °C for 8 h or 1200 °C for 12 h. X-ray diffraction and nitrogen adsorption-desorption measurements indicated that the presence of zirconia prevents the sintering of alumina and the obtained ZrO$_{2}$-Al$_{2}$O$_{3}$ composites have much larger surface areas than pure alumina. Temperature-programmed desorption of ammonia results illustrated that the addition of zirconia leads to an increase in the number of strong acid sites and the total number of acid sites compared with pure alumina. Thus, the spherical mesoporous ZrO$_{2}$-Al$_{2}$O$_{3}$ composites prepared in this way were shown to be suitable for high temperature catalytic processes as a catalyst support.
Starting Page	1032
Ending Page	1038
Page Count	7
File Format	PDF
ISSN	16747291
Journal	Science in China Series B: Chemistry
Volume Number	54
Issue Number	7
e-ISSN	18691870
Language	English
Publisher	SP Science China Press
Publisher Date	2011-06-29
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	spherical alumina ZrO$_{2}$-Al$_{2}$O$_{3}$ composites mesoporous material thermal stability Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry

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