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Since the first
zeolite-based FCC catalysts were introduced by Grace Davison in
the early 1960's, zeolite technology has continued to evolve to
meet the increasing demands of todays refiners. Grace Davison
manufactures a range of modified faujasite materials that include
rare earth exchanged ultrastable Y (REUSY) zeolites, rare
earth free Z-21 zeolite, and the novel high activity CSSN and
CSX zeolites. |
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Grace Davison was the first
catalyst manufacturer to introduce Selective Active Matrix
(SAM) systems based on special reactive aluminas. Not only are
these matrices able to pre-crack the heaviest portion of the
feedstock, but they are also designed to maximise the diffusion
of heavy feed molecules to the more coke-selective acid
sites in the zeolite component. In addition, our SAM systems passivate contaminant metals such as
vanadium, nickel, iron
and sodium. |
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FCC unit operating
constraints depend upon the nature of the feedstock and the
existing configuration of the unit. Selection of the
appropriate FCC catalyst technology plays a key role in
maximising profitability within these constraints. This is achieved through a
complete review of the unit operation, all the constraints
under the different operational scenarios, as well as a
knowledge of the feed properties. Customer feeds
are usually used in extensive laboratory studies to help indentify the
most suitable catalyst technology for a particular operation.
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