Catalysts bound with low acidity refractory oxide
AssigneeMobil Oil Corporation
InventorDavid O. Marler
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Abstract
Low acidity refractory oxide-bound molecular sieve, e.g., zeolite, compositions, for example, zirconia-bound zeolite Beta, possessing superior physical properties, e.g., crush strength, and the method for their manufacture are described. Since low acidity refractory oxide-bound catalysts are less active than alumina-bound zeolite catalysts, the former are particularly useful in hydrocarbon conversion processes in which reduced coke make increases catalyst cycle length. Due to their stability in acid environments, the low acidity refractory oxide-bound molecular sieve extrudate herein can be acid treated without unduly compromising its structural integrity.
Claims22
A method for preparing a low acidity refractory oxide-bound molecular sieve composition which comprises:
- a) providing a substantially homogenous mixture of molecular sieve, dispersant, a low acidity refractory oxide binder material and hydroxy-bridged metallopolymer, alkoxy-bridged metallopolymer or mixture thereof to provide a formable mass;
- b) forming the formable mass resulting from step (a);
- and
- c) calcining the formed product resulting from step (b).
A method for preparing a low acidity refractory oxide-bound molecular sieve composition which comprises:
- a) continuously providing a substantially homogenous mixture of molecular sieve, dispersant, a low acidity refractory oxide binder material and hydroxy-bridged metallopolymer, alkoxy-bridged metallopolymer or mixture thereof to provide an extrudable mass;
- b) continuously extruding the extrudable mass resulting from step (a) using a screw extruder;
- c) drying the extrudate resulting from step (b);
- and
- d) calcining the dried extrudate resulting from step (c).
Dependencies are inferred from the claim text.