 Filter assembly |
| It is an object of the present invention to provide an improved filter assembly which overcomes, or ... |
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| Filter base assembly |
| OF THE PREFERRED EMBODIMENT With reference to the drawings wherein like numerals represent like ... |
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| High dielectric capacitors |
| In view of the above discussion, it is an object of the present invention to provide high ... |
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| Membrane for separating off small molecules and method for the production thereof |
| A separating membrane has now been found which has a pore size which can be accurately adjusted so ... |
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| Molecular sieving silica membrane fabrication process |
| It is an object of this invention to provide a process for producing molecular sieving silica ... |
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| Wear and thermal shock resistant SiAlON cutting tool material |
| It is an object of this invention to avoid or alleviate the problems of the prior art. It is ... |
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| Method of preparing crystalline zeolitic aluminosilicates |
| What is claimed is: 1. In a method of preparing crystalline ZSM-5 or ZSM 11 zeolites with an atomic ... |
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| Small crystal ZSM-5, as a catalyst |
| OF THE INVENTION In one embodiment of the invention, a component of the crystallization reaction ... |
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| Synthesis process for faujasite family zeolites using mother liquor recycle |
| What is claimed is: 1. A process for preparing an aluminosilicate having a faujasite family ... |
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| Method for preparing [F-18-]fluoride ion |
| OF THE INVENTION According to the present invention, there is provided a method for preparing [F-18... |
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Zinc-aluminum-phosphorus-silicon-oxide molecular sieve compositions
| Details |
Inventors: Lok, Brent M. T.; Vail, Lawrence D.; Flanigen, Edith M.;
Assignee: UOP (Des Plaines, IL)
Primary Examiner: Doll; John
Assistant Examiner: Breneman; R. Bruce
Attorney, Agent or Firm: McBride; Thomas K., Snyder; Eugene I., Molinaro; Frank S.
Crystalline molecular sieves having three-dimentional microporous framework structures of ZnO.sub.2, AlO.sub.2, SiO.sub.2 and PO.sub.2 tetrahedral units are disclosed. These molecular sieves have an empirical chemical composition on an anhydrous basis expressed by the formula: mR: (Zn.sub.w Al.sub.x P.sub.y Si.sub.z)O.sub.2 wherein "R" represents at least one organic templating agent present in the intracrystalline pore system; "m" represents the molar amount of "R" present per mole of (Zn.sub.w Al.sub.x P.sub.y Si.sub.z)O.sub.2 ; and "w", "x", "y" and "z" represent the mole fractions of zinc, aluminum, phosphorus and silicon, respectively, present as tetrahedral oxides. Their use as adsorbents, catalysts, etc. is also disclosed. |
|
DETAILED DESCRIPTION OF THE INVENTION The instant invention relates to a new class of three-dimensional microporous crystalline molecular sieves having a crystal framework structures of ZnO.
sub.
2.
sup.
-2, AlO.
sub.
2.
sup.
-, PO.
sub.
2.
sup.
+ and SiO.
sub.
2 tetrahedral oxide units.
These new molecular sieves exhibit ion-exchange, adsorption and catalytic properties, and accordingly find wide use as adsorbents and catalysts.
The ZnAPSO molecular sieves of the instant invention comprise framework structures of ZnO.
sub.
2.
sup.
-2, AlO.
sub.
2.
sup.
-, PO.
sub.
2.
sup.
+ and SiO.
sub.
2 tetrahedral units having an empirical chemical composition on an anhydrous basis expressed by the formula: mR:(Zn.
sub.
w Al.
sub.
x P.
sub.
y Si.
sub.
z)O.
sub.
2 wherein "R" represents at least one organic templating agent present in the intracrystalline pore system; "m" represents the molar amount of "R" present per mole of (Zn.
sub.
w Al.
sub.
x P.
sub.
y Si.
sub.
z)O.
sub.
2 and has a value of zero to about 0.
3; and "w", "x", "y" and "z" represent the mole fractions of zinc, aluminum, phosphorus and silicon, respectively, present as tetrahedral oxides and each has a value of at least 0.
01.
The mole fractions "w", "x", "y" and "z" are generally defined being within the pentagonal compositional area defined by points A, B, C, D and E of the ternary diagram of FIG.
1.
Points A, B, C, D and E of FIG.
1 have the following values for "w", "x", "y", and "z":
______________________________________
Mole Fraction
Point x y (z + w)
______________________________________
A 0.
60 0.
38 0.
02
B 0.
38 0.
60 0.
02
C 0.
01 0.
60 0.
39
D 0.
01 0.
01 0.
98
E 0.
60 0.
01 0.
39
______________________________________
In the preferred subclass of ZnAPSO molecular sieves the values "w", "x", "y" and "z" in the above formular are within the tetragonal compositional area defined by points a, b, c and d of the ternary diagram which is FIG.
2 of the drawings, said points a, b, c and d representing the following values for "w", "x", "y" and "z"
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Semiconductor manufacture 
