Claims
- 1. A method for preparing a synthetic crystalline zeolite material consisting essentially of ZSM-5 and an unidentified crystalline material having the X-ray diffraction pattern of Table II and having a constraint index between 1 and 12 and a SiO.sub.2 /Al.sub.2 O.sub.3 ratio greater than 5 which comprises preparing a reaction mixture containing a source of an alkali metal oxide, an oxide of silicon, optionally an oxide of aluminum, R.sub.2 O, 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 =10 to .infin.
- M.sub.2 O/SiO.sub.2 =0.01 to 3.0
- R.sub.2 O/M.sub.2 O=0.01 to 2.0
- OH/SiO.sub.2 =0 to 1.0
- wherein M is an alkali or alkaline earth metal and R.sub.2 O is an organic nitrogen-N-oxide selected from the group consisting of 4-picoline-N-oxide and a trialkyl-amine-N-oxide wherein the alkyl group comprises C.sub.2 -C.sub.5 hydrocarbons and maintaining said mixture under crystallization conditions until crystals of said zeolite material are formed.
- 2. A method according to claim 1 wherein said trialkyl-amine-N-oxide is tripropyl-amine-N-oxide.
- 3. A method of preparing in situ a catalyst composition consisting essentially of a ZSM-5 zeolite in an inorganic oxide binder which comprises:
- (a) preparing a reaction mixture containing a source of an alkali metal oxide, an oxide of silicon, optionally an oxide of aluminum, R.sub.2 O, 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 =10 to .infin.
- M.sub.2 O/SiO.sub.2 =0.01 to 3.0
- R.sub.2 O/M.sub.2 O=0.01 to 2.0
- OH/SiO.sub.2 =0 to 1.0
- wherein M is an alkali or alkaline earth metal and R.sub.2 O is an organic nitrogen-n-oxide selected from the group consisting of 4-picoline-N-oxide and a trialkyl-amine-N-oxide wherein the alkyl group comprises C.sub.2 -C.sub.5 hydrocarbons,
- (b) maintaining said mixture under crystallization conditions until crystals consisting essentially of ZSM-5 and an unidentified crystalline material having the X-ray diffraction pattern of Table II are formed, and
- (c) subjecting said crystals to thermal treatment effective to cause the unidentified crystalline material to collapse forming an inorganic oxide binder for the ZSM-5.
- 4. A method according to claim 3 wherein said trialkyl-amine-N-oxide is tripropyl-amine-N-oxide.
Parent Case Info
This is a continuation of application Ser. No. 156,902, filed June 6, 1980 now abandoned.
US Referenced Citations (8)
Continuations (1)
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Number |
Date |
Country |
Parent |
156902 |
Jun 1980 |
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