Appeal No. 1996-3493
Application No. 08/451,697
April 9, 1996) for the examiner’s reasoning in support of the rejection and to the appellants’ brief
(Paper No. 8, filed March 20, 1996) for the appellants’ arguments thereagainst.
THE INVENTION
Appellants’ claimed invention is directed to an attrition resistant catalyst composition comprising
one or more acidic zeolites selected from rho and chabazite which are uniformly admixed to a ratio of
from about 25 to about 75 weight % with one or more particulate binders selected from kaolin,
bentonite, alpha-alumina and titania (brief, page 3).
OPINION
Bergna discloses acidic zeolite catalysts selected from the group consisting of chabazite,
erionite, ZK-5 and rho which have been modified by depositing thereon at least 0.05 weight % of at
least one element selected from the group consisting of silicon, aluminum, phosphorus and boron, which
catalysts are useful for producing dimethylamine (DMA) (col. 4, lines 44-58). Zeolite rho synthesized
+ + + +
in a Na-Cs form is converted to the H -form by exchanging the Na and Cs ions for NH ions and
4
deammoniating by calcination at 400 EC to 800EC (col. 6, lines 57-63). Zeolite H -rho which was+
further treated with tetraethylorothosilicate before calcination had improved selectivity for DMA (col.
14, line 47 - col. 15, line 22). Ammoniated zeolite chabazite is also converted to its H -form by+
- 3 -
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