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US 7,247,287 B2Granted
Synthesis of aluminophosphates and silicoaluminophosphates
AssigneeExxonMobil Chemical Patents Inc.
InventorsGuang Cao, Matu J. Shah
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AssigneeExxonMobil Chemical Patents Inc.
InventorsGuang Cao, Matu J. Shah
Estimating the term…
The invention is directed to a method of synthesising silicoaluminophosphate and aluminophosphate molecular sieves using synthesis templates that contain at least one template of general formula R1R2N—R3, wherein R1 and R2 are independently selected from the group consisting of alkyl groups having from 1 to 3 carbon atoms and hydroxyalkyl groups having from 1 to 3 carbon atoms; R3 is selected from the group consisting of 4- to 8-membered cycloalkyl groups, optionally substituted by 1 to 3 alkyl groups having from 1 to 3 carbon atoms, and 4- to 8-membered heterocyclic groups having from 1 to 3 heteroatoms, said heterocyclic groups being optionally substituted by 1 to 3 alkyl groups having from 1 to 3 carbon atoms and the heteroatoms in said heterocyclic groups being selected from the group consisting of O, N, and S. In particular, the present invention relates to the synthesis of silicoaluminophosphate molecular sieves of the CHA framework type having a low silicon to aluminium atomic ratio.
A process for preparing low acidity crystalline silicoaluminophosphate molecular sieve of CHA framework type, the process comprising:
A silicoaluminophosphate molecular sieve, 90% or greater of CHA framework type, comprising within its intra-crystalline structure at least one organic template of formula (I)
A silicoaluminophosphate molecular sieve, 90% or greater of CHA framework type, comprising within its intra-crystalline structure at least one organic template of formula (II)
A silicoaluminophosphate molecular sieve according to claim 14, 90% or greater of CHA framework type, comprising N,N-dimethyl-cyclohexylamine within its intra-crystalline structure.
A crystalline silicoaluminophosphate molecular sieve having a characteristic X-ray powder diffraction pattern containing at least the d-spacings as set forth in Table Ia, wherein the Si/Al ratio in said molecular sieve after calcination is less than 0.167.
A crystalline silicoaluminophosphate molecular sieve, having a characteristic X-ray powder diffraction pattern containing at least the d-spacings as set forth in Table Ib, wherein the Si/Al ratio in said molecular sieve after calcination is less than 0.167.
A crystalline silicoaluminophosphate molecular sieve having a characteristic X-ray powder diffraction pattern containing at least the d-spacings as set forth in Table IIIa, wherein the Si/Al ratio in said molecular sieve after calcination is less than 0.167.
A crystalline silicoaluminophosphate molecular sieve having a characteristic X-ray powder diffraction pattern containing at least the d-spacings as set forth in Table IIIb, wherein the Si/Aratio in said molecular sieve after calcination is less than 0.167.
Dependencies are inferred from the claim text.