Synthetic crystalline metal silicate compositions and preparation thereof

Claim 1

A method of preparing a crystalline metal silicate which is substantially free of aluminum having a composition, in terms of mole ratios as follows: 0.8±0.4 M 2 / n O:W 2 O 3 :5 to 500 SiO 2 :0 to 100 H 2 O where M is a cation, n is the valence of said cation and W 2 O 3 is a metal oxide, said metal silicate having the X-ray diffraction pattern set forth in Table 1 of the specification, and a nitrogen isotherm adsorption capacity as shown in FIG. 1 which comprises preparing a reaction mixture which is substantially free of aluminum ions and which contains tetraalkylammonium compound, sodium hydroxide, an oxide of the desired metal, an oxide of silicon, water and an aluminum chelating agent effective to provide a catalytically active crystalline metal silicate, maintaining the mixture at an elevated temperature until crystals of said metal silicate are formed and separating and recovering said crystals, and in terms of mole ratios falling within the following ranges, the reaction mixture contains: ______________________________________ OH.sup.- /Si O.sub.2 .05-3 R.sub.4 N.sup.+ /(R.sub.4 N.sup.+ + Na.sup.+) 0.1--H.sub.2 O/OH 10-500 SiO.sub.2 /W.sub.2 O.sub.3 5-500 SiO.sub.2 /Chelating agent 1-1000 ______________________________________ wherein R is propyl.

Claim 2

A method of preparing a crystalline metal silicate which is substantially free of aluminum having a composition, in terms of mole ratios as follows: 0.8±0.4 M 2 / n O:W 2 O 3 :5 to 500 SiO 2 :0 to 100 H 2 O where M is a cation, n is the valence of said cation and W 2 O 3 is a metal oxide, said metal silicate having the X-ray diffraction pattern set forth in Table 1 of the specification, and a nitrogen isotherm adsorption capacity as shown in FIG. 1 which comprises preparing a reaction mixture which is substantially free of aluminum ions and which contains tetraalkylammonium compound, sodium hydroxide, an oxide of the desired metal, an oxide of silicon, water and an aluminum chelating agent effective to provide a catalytically active crystalline metal silicate, maintaining the mixture at an elevated temperature until crystals of said metal silicate are formed and separating and recovering said crystals, and in terms of mole ratios falling within the following ranges, the reaction mixture contains: ______________________________________ OH.sup.- /Si O.sub.2 .05-3 R.sub.4 N.sup.+ /(R.sub.4 N.sup.+ + Na.sup.+) 0.1--H.sub.2 O/OH 10-500 SiO.sub.2 /W.sub.2 O.sub.3 5-500 SiO.sub.2 /Chelating agent 1-1000 ______________________________________ wherein R is propyl.

Claim 6

A method of activating a crystalline metal silicate which is substantially free of aluminum having a composition, in terms of mole ratios as follows: 0.8±0.4 M 2 /nO:W 2 O 3 :5 to 500 SiO 2 :O to 100 H 2 O where M is a cation, n is the valence of said cation and W 2 O 3 is a metal oxide, said metal silicate having the X-ray diffraction pattern set forth in Table 1 of the specification, and a nitrogen isotherm adsorption capacity as shown in FIG. 1 which comprises: (1) Heat treating the dried silicate composition at about 200° to 900° C. (2) Treating the heated silicate with a reducing agent for about 1 to 80 hours at about 200° to 900° C.; and (3) Heat treating the reduced silicate following the procedure of step (1).

Claim 7

A method of activating a crystalline metal silicate which is substantially free of aluminum having a composition, in terms of mole ratios as follows: 0.8±0.4 M 2 /nO:W 2 O 3 :5 to 500 SiO 2 :O to 100 H 2 O where M is a cation, n is the valence of said cation and W 2 O 3 is a metal oxide, said metal silicate having the X-ray diffraction pattern set forth in Table 1 of the specification, and a nitrogen isotherm adsorption capacity as shown in FIG. 1 which comprises: (1) Heat treating the dried silicate composition at about 200° to 900° C. (2) Treating the heated silicate with a reducing agent for about 1 to 80 hours at about 200° to 900° C.; and (3) Heat treating the reduced silicate following the procedure of step (1).