Page 116 - Fluid Catalytic Cracking Handbook

FCC Catalysts §3

5
Yield of Gasoline, %
4 ~ I

3
2 Gasoline octane

(R+MV2
1
0
0 2 4 6 8 10 12

Rare Earth, wt%
Figure 3-6. Effects of rare earth on gasoline octane and yield.

the weight percent of sodium or soda (Na 2O) on the catalyst. The proper
way to compare sodium is the weight fraction of sodium in the zeolite,
This is because FCC catalysts have different zeolite concentrations.
UCS, rare earth, and sodium are just three of the parameters that
are readily available to characterize the zeolite properties. They pro-
vide valuable information about catalyst behavior in the cat cracker.
If required, additional tests can be conducted to examine other
zeolite properties.

Matrix

The term matrix has different meanings to different people. For
some, matrix refers to components of the catalyst other than the
zeolite. For others, matrix is a component of the catalyst aside from
the zeolite having catalytic activity. Yet for others, matrix refers to
the catalyst binder. In this chapter, matrix means components of the
catalyst other than zeolite and the term active matrix means the
component of the catalyst other than zeolite heaving catalytic activity.