Preparation of shape selective zeolite alpha as catalyst
AssigneeMobil Oil Corporation
InventorGuenter H. Kuehl
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Abstract
A method is provided for preparing a synthetic crystalline aluminosilicate zeolite Alpha containing platinum-group metal within the zeolite pores as synthesized, thereby providing shape-selective hydrogenation activity. The method comprises synthesizing the zeolite from a reaction mixture of controlled composition including a source of a cationic platinum-group metal complex. Catalysts made with the zeolite synthesized in accordance hereto are stable, both thermally and in the presence of steam, and exhibit beneficial shape-selectivity in catalysis and absorption.
Claims45
A method for synthesizing crystalline aluminosilicate zeolite Alpha containing platinum-group metal within the zeolite pores which comprises the steps of preparing a reaction mixture containing sources of sodium oxide, tetramethylammonium oxide, aluminum oxide, silicon dioxide, a cationic platinum-group metal complex and water and having a composition, in terms of mole ratios of oxides, falling within the following ranges:
- ______________________________________ SiO.sub.2 /Al.sub.2 O.sub.3 = 4.0-12.0 H.sub.2 O/(Na.sub.2 O + R.sub.2 O) = 15.0-40.0 (Na.sub.2 O + R.sub.2 O)/Al.sub.2 O.sub.3 = 2.0-7.0 Na.sub.2 O/(Na.sub.2 O + R.sub.2 O) = 0.2-0.75 M/Al.sub.2 O.sub.3 = 10.sup.-6 -0.06 ______________________________________
- wherein R is a tetramethylammonium cation and M is a platinum-group metal, aging said mixture for from about 2 hours to about 100 hours at a temperature of from about 10.degree. C. to about 70.degree. C., and then heating said mixture at a temperature of from about 80.degree. C. to about 150.degree. C. until crystals of said zeolite are formed.
Dependencies are inferred from the claim text.