Synthesis of crystalline ZSM-5-type material
AssigneeMobil Oil Corporation
InventorsClarence D. Chang, Stuart D. Hellring, Randy F. Striebel
Life of this patent
Estimating the term…
Abstract
This invention relates to a new form of crystalline material identified as zeolite ZSM-5-type, to a new and useful method for synthesizing said crystalline material and to use of said crystalline material prepared in accordance herewith as a catalyst for organic compound, e.g. hydrocarbon compound, conversion.
Claims17
A method for synthesizing crystalline material exhibiting a characteristic X-ray diffraction pattern including d-spacing maxima values as follows:
- ______________________________________ Interplanar d-spacing, (A) Relative Intensity (I/I.sub.o) ______________________________________ 11.00 .+-. 0.25 s-vs 9.80 .+-. 0.30 m-vs 6.70 .+-. 0.10 w 6.30 .+-. 0.10 w 5.98 .+-. 0.10 w 5.55 .+-. 0.10 w 5.00 .+-. 0.10 w 4.36 .+-. 0.10 w 4.25 .+-. 0.08 w 4.08 .+-. 0.05 w 3.85 .+-. 0.07 m-vs 3.71 .+-. 0.05 w-m 3.62 .+-. 0.04 w 3.04 .+-. 0.03 w 2.99 .+-. 0.02 w ______________________________________
- where vs=very strong (75-100), s=strong (50-74), m=medium (25-49) and w=weak (0-24), 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), water and 1,2-diaminocyclohexane directing agent (R), and having a composition, in terms of mole ratios, within the following ranges:
- ______________________________________ YO.sub.2 /X.sub.2 O.sub.3 >50 H.sub.2 O/YO.sub.2 10 to 100 OH.sup.- /YO.sub.2 0 to 0.5 M/YO.sub.2 0 to 2.0 R/YO.sub.2 0.01 to 2.0 ______________________________________
- (ii) maintaining said mixture under sufficient conditions until crystals of said material are formed;
- and (iii) recovering said crystalline material from step (ii), said recovered crystalline material containing said R.
A mixture capable of forming crystals of ZSM-5 structure upon crystallization, said mixture comprising sources of alkali or alkaline earth metal (M), trivalent element (X) oxide selected from the group consisting of oxide of aluminum, boron, iron, gallium, indium and mixtures thereof;
- tetravalent element (Y) oxide selected from the group consisting of oxide of silicon, germanium, tin and mixtures thereof;
- water and 1,2-diaminocyclohexane directing agent (R), and having a composition, in terms of mole ratios, within the following ranges:
- ______________________________________ YO.sub.2 /X.sub.2 O.sub.3 >50 H.sub.2 O/YO.sub.2 10 to 100 OH.sup.- /YO.sub.2 0 to 0.5 M/YO.sub.2 0 to 2.0 R/YO.sub.2 0.01 to 2.0. ______________________________________
Dependencies are inferred from the claim text.