6533b857fe1ef96bd12b3905
RESEARCH PRODUCT
Is the formation of a zeolite from a dry powder via a gas phase transport process possible?
Klaus K. UngerFerdi SchüthR. Althoffsubject
Vapor pressureChemistryGeneral EngineeringGeneral ChemistryAmorphous solidChemical engineeringPhase (matter)ReagentMass transferOrganic chemistryGeneral Materials ScienceZSM-5ZeoliteWater contentdescription
Abstract ZSM-5 was synthesized by four methods with a gradually decreasing water content ending in a reaction mixture with absolutely dry reagents in the form of a powder in the complete absence of a solution phase. Amorphous precursors obtained by drying SiO2·A2O3 gels at 650°C were transformed into zeolites in the presence of dried NH4F and TPABr. Some water is probably formed as a reaction product, but the maximum water pressure is appreciably below the saturation pressure under the given reaction conditions. To explain the formation of a zeolite, we suggest a vapor phase mass transfer process with SiF4 as the mobile species between the solid phase, which contains the amorphous Si/Al precursor, and the zeolite formed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1994-07-01 | Microporous Materials |