Abstract
SBA-15 supported sulfated zirconia (SZ) catalysts were employed in many acid-catalysis of reactions under mild condition because it is a strong solid acid with various Lewis and Br0nsted acid sites. An oxybromination of aromatic substrates using hydrogen peroxide and ammonium bromide in the aqueous phase under mild temperature and near-neutral pH condition over SZ was achieved. A good to excellent para-selectivity was observed. The mesoporous silica SBA-15 supported SZ possessed higher catalytic activity than self-supported SZ because of larger surface area and pore size. The effect of the calcinations temperature was also investigated. The good catalytic performance of the SZ/SBA-15 materials was attributed to high degree of dispersion of sulfate groups to give sulfated silica-zirconia of (1) very good redox property and (2) high strength and high density of acid sites. The SZ/SBA-15 catalyst may be re-used several times without substantial loss of activity.
Original language | English |
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Pages (from-to) | 820-828 |
Number of pages | 9 |
Journal | Journal of the Chinese Chemical Society |
Volume | 57 |
Issue number | 4 B |
DOIs | |
Publication status | Published - 2010 |
Externally published | Yes |
Keywords
- Oxybromination
- Para-Selectivity
- SBA-15
- Sulfated zirconia
ASJC Scopus subject areas
- Chemistry(all)