Appeal No. 96-2479
Application No. 08/091,428
This is a decision on an appeal from the refusal of the
examiner to allow claims 1 and 3 through 10 as amended
subsequent to the final rejection. These are all of the
claims remaining in the application.
The subject matter on appeal relates to a process for
cracking a gas oil comprising contacting the gas oil under
sufficient cracking conditions with a catalyst comprising
yttrium containing ultrastable zeolite Y wherein the catalyst
contains no intentionally added rare earth ions and wherein
the zeolite Y contains no more than about 0.02 weight percent
of rare earth elements. This appealed subject matter is
adequately illustrated by independent claim 1 which reads as
follows:
1. A process for cracking a gas oil, said process
comprising contacting said gas oil under sufficient cracking
conditions with a catalyst comprising yttrium containing
ultrastable zeolite Y, said zeolite Y being essentially free
of rare earth ions, wherein said cracking conditions include a
temperature of from about 300EC to about 700EC, a pressure of
from about 0.1 atmosphere (bar) to about 30 atmospheres and a
weight hourly space velocity of from about 0.1 to about 20,
wherein said catalyst contains at least 0.1 wt % yttrium,
wherein said catalyst contains no intentionally added rare
earth ions, and wherein said zeolite Y contains no more than
about 0.02 wt % of rare earth elements as measured by
elemental analysis.
The references relied upon by the examiner as evidence of
2
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