Design-for-testability for object-oriented software by Payne J.E.

By Payne J.E.

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4. SCOPE OF FCC CATALYSIS Cracking catalyst systems have also been evolving continuously for over 50 years, and catalysts are still at the heart of the FCC process. Worldwide FCC catalyst production is over 1100 tons per day, and sales are over 500 million dollars per year. The major vendors are listed in Table 3. In recent years, overcapacity has kept prices low, competition stiff, and resulted in several consolidations. Should FCC catalysts be treated as specialty chemicals, as they have been mostly, or as a commodity?

However, it is possible that a major breakthrough in catalysis will show that unique structures with pore openings larger than Y zeolite will offer superior metal tolerance and selectivity over Y zeolite. Other future trends are likely to be a continuation of recent ones: Zeolite content is likely to keep increasing, particularly with emphasis on resid processing. Today’s premium FCC catalysts, with about 40% zeolite, can be extrapolated to about 50% zeolite before significant degradation in zeolite availability and physical properties takes place.

G. via hydride abstraction) H' H' 0 0 0 0 0 0 . / \ / \ \ / \ Al- Si Al- Si A A A A A 0 0 00 0 0 0 \ / \ Si A 0 Figure 3 . / \ / Si 0 0 0 0 Si' A A 0 0 0 A1 Si A 0 0 0 / / \ / \ Al- 0 0 00 A 0 0 Formation of Lewis Acid Sites 0 48 The elimination of water by dehydroxylation should lead to the creation of one Lewis acid site from every two Bronsted sites. This was confirmed by Ward [39], who also observed that the number of Bronsted acid sites converted to Lewis sites increases with temperature until about 1500°F, when only the latter remain (see Figure 4 ) .

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