Procedure for preparing molecular sieve films
AssigneeExxon Chemicals Patents Inc.
InventorsPer Johan Sterte, Jonas Hedlund, Brian J. Schoeman
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Abstract
The invention is comprised of a procedure for applying molecular sieve films to the surface of different substrates. This procedure is characterized in that microcrystals of the molecular sieves in question bind to the substrate surface in a first step as a monolayer, and are then, in a second step, allowed to grow into a thin, continuous and dense film. Molecular sieve films are of interest in application areas such as preparing membranes, catalysts, sensor devices and polymer reinforcing fillers.
Claims44
A method of preparing a monolayer structure comprising molecular sieve microcrystals which method comprises;
- a) preparing a dispersion comprising discrete microcrystals of molecular sieve which have a surface charge,
- b) selecting or preparing a substrate with a surface charge which is opposite to that of the discrete microcrystals in the dispersion,
- c) contacting the substrate with the dispersion comprising discrete microcrystals of molecular sieve such that discrete microcrystals of molecular sieve are attracted to and adhere to the substrate as a monolayer.
A method of preparing a structure comprising a molecular sieve film which method comprises:
- (a) depositing on a substrate a monolayer comprising molecular sieve microcrystals which are capable of nucleating the growth of a molecular sieve film, said microcrystals having a crystal size of at most 500 nm;
- (b) forming a molecular sieve synthesis solution;
- and
- (c) contacting (a) and (b) and hydrothermally growing molecular sieve to form a molecular sieve film on the substrate.
Dependencies are inferred from the claim text.