Synthetic porous crystalline MCM-71, its synthesis and use
AssigneeExxon Mobil Oil Corporation
InventorSandeep Singh Dhingra
Life of this patent
Estimating the term…
Abstract
This invention relates to a new synthetic porous crystalline material, designated MCM-71, a method for its preparation and its use in catalytic conversion of organic compounds. The new crystalline material exhibits a distinctive X-ray diffraction pattern and has a unique 3-dimensional channel system comprising generally straight, highly elliptical channels, each of which is defined by 10-membered rings of tetrahedrally coordinated atoms, intersecting with sinusoidal channels, each of which is defined by 8-membered rings of tetrahedrally coordinated atoms.
Claims13
A synthetic porous crystalline material with a framework of tetrahedral atoms bridged by oxygen atoms, the tetrahedral atom framework being defined by a unit cell with atomic coordinates in nanometers shown in Table 1, wherein each coordinate position may vary within ±0.05 nm.
A synthetic porous crystalline material characterized by an X-ray diffraction pattern including values substantially as set forth in Table 2 of the specification.
A method for synthesizing crystalline material exhibiting a characteristic X-ray diffraction pattern including d-spacing maxima values shown in Table 2 which comprises (i) preparing a mixture capable of forming said material, said mixture comprising sources of alkali or alkaline earth metal (M), an oxide of trivalent element (X), an oxide of tetravalent element (Y) and water, having a composition, in terms of mole ratios, within the following ranges:
- YO2/X2O3 2-100,000 H2O/YO2 10-1000 OH−/YO2 0.02-2 M/YO2 0.02-2
- (ii) maintaining said mixture under sufficient conditions including a temperature of from about 100° C. to about 220° C. until crystals of said material are formed;
- and (iii) recovering said crystalline material from step (ii).
Dependencies are inferred from the claim text.