In 1938, Exxon Research joined a consortium of large oil and processing companies that came up with the concept of fluidized bed catalyst, which is then used for catalytic cracking of crude oil feed in gasoline production.
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Geldart classified particles into four groups by the particle size and its characteristics.
Stream bed | Reed bed | Bed Bath & Beyond | Bubbling Under Hot 100 Singles | Beecher's Trilobite Bed | bed and breakfast | bed | Your Side of the Bed | Wet the Bed | reed bed | Ghost Beside My Bed | Fred Come to Bed | Bunk bed | Bed and Breakfast | Bed and breakfast | BEd | X-linked congenital stationary night blindness | wet the bed | The cover of ''No Jumping on the Bed!'', written and illustrated by Tedd Arnold | The Burning Bed | ''The Bed'' by Henri de Toulouse-Lautrec | stationary steam engine | Stationary process | stationary process | Stationary High Altitude Relay Platform | stationary | Seagrass bed with dense ''Thalassia testudinum'' and an immature queen conch (''Eustrombus gigas | In Bed With Chris Needham | Early to Bed | Dreams (bed retailer) |