Chemistry of inorganic compounds – Zeolite – Isomorphic metal substitution
Patent
1999-02-24
2000-12-19
Knode, Marian C.
Chemistry of inorganic compounds
Zeolite
Isomorphic metal substitution
423DIG27, 502 85, 502 86, C01B 3336, C01F 700, B01J 2904
Patent
active
061624160
ABSTRACT:
There is disclosed a new form of zeolite beta which shows substantially greater stability and greater catalyst lifetime when used in the alkylation and transalkylation of aromatic compounds. The new, surface-modified zeolite beta is characterized by having surface aluminum 2p binding energies, as measured by X-ray photoelectron spectroscopy, of at least 74.8 electron volts. This surface-modified zeolite beta is prepared by treating an as synthesized and templated zeolite beta with an acid at a pH between about 0 and about 2 at a temperature up to about 125.degree. C. for a time sufficient to modify the chemical environment of the surface aluminum atom without bringing about dealumination of the zeolite beta, then calcining the acid-treated templated material at 550-700.degree. C. to remove the template.
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Gajda Gregory J.
Gajek Richard T.
Dang Thuan D.
Knode Marian C.
Molinaro Frank S.
Tolomei John G.
UOP LLC
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