Synthesis of crystalline silicate ZSM-12
AssigneeMobil Oil Corporation
InventorErnest W. Valyocsik
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Abstract
This invention relates to a new and improved form of crystalline silicate identified as zeolite ZSM-12, to a new and useful improvement in synthesizing said crystalline silicate and to use of said crystalline silicate prepared in accordance herewith as a catalyst for organic compound, e.g. hydrocarbon compound, conversion.
Claims18
A method for synthesizing a crystalline silicate having a composition in the anhydrous state, expressed in terms of mole ratios of oxides, as follows:
- (0.1 to 4)R.sub.2 O:(0.05 to 2)M.sub.2/n O:(0.005 to 2)Al.sub.2 O.sub.3 :(100)SiO.sub.2
- wherein M is at least one alkali metal cation having the valence n, and R is a cation derived from the monomeric diquaternary bis(dimethylpiperidinium)trimethylene compound having the formula ##STR2## wherein X is an anion, and exhibiting a characteristic X-ray diffraction pattern as shown in Table 1 of the specification, which comprises preparing a mixture containing sources of alkali metal oxide, an organic nitrogen-containing cation, an oxide of silicon and water and having a composition, in terms of mole ratios, within the following ranges:
- ______________________________________ SiO.sub.2 Al.sub.2 O.sub.3 60 or greater H.sub.2 O/SiO.sub.2 5 to 200 OH.sup.- /SiO.sub.2 0.01 to 2.0 M/SiO.sub.2 0.01 to 3.0 R/SiO.sub.2 0.02 to 1.5 ______________________________________
- wherein M and R are as above defined, and maintaining the mixture at a temperature of from about 80.degree. C. to about 250.degree. C. until crystals of the crystalline silicate are formed.
A synthetic crystalline silicate having a composition in the anhydrous state, expressed in terms of mole ratios of oxides, as follows:
- (0.1 to 4)R.sub.2 O:(0.05 to 2)M.sub.2/n O:(0.005 to 2)Al.sub.2 O.sub.3 :(100)SiO.sub.2
- wherein M is at least one alkali metal cation having the valence n, and R is a cation derived from the monomeric diquaternary bis(dimethylpiperidinium)trimethylene compound having the formula ##STR3## wherein X is an anion, and exhibiting a characteristic X-ray diffraction pattern as shown in Table 1 of the specification.
Bis(dimethylpiperidinum) trimethylene-containing ZSM-12 exhibiting an X-ray diffraction pattern having the characteristic lines shown in Table 1 of the specification.
Dependencies are inferred from the claim text.