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Granulation of sol‐gel‐derived nanostructured alumina
Author(s) -
Deng S. G.,
Lin Y. S.
Publication year - 1997
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690430223
Subject(s) - granulation , sol gel , materials science , chemical engineering , nanotechnology , composite material , engineering
A sol‐gel granulation process was developed to prepare porous nanostructured γ‐alumina granules as supports for catalysts and adsorbents. The process, which starts with an aqueous sol of gelatinous boehmite, involves droplet formation, gelation in paraffin oil, conditioning in ammonia solution, and drying and calcination in air under controlled conditions. The γ‐Al 2 O 3 granules prepared are 1–3 mm‐dia. spherical particles with large surface area (380 m 2 /g) and pore volume (0.5 cm 3 /g), uniform pore‐size distribution (20–60 Å), and controllable average pore size (35 Å). These sol‐gelderived granules have excellent mechanical properties with crush strength (>100 N per granule) and attrition resistance (<0.01 wt. %/h), much better than the commercial alumina and zeolite granules. Supported CuO sorbents were prepared on these granules for SO 2 removal applications. The alumina‐supported CuO sorbents contain higher loading of well‐dispersed CuO and better sulfation properties than similar sorbents reported in the literature.