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Layers comprising a molecular sieve layer on a porous or non-porous support, having uniform properties and allowing high flux are prepared from colloidal solutions of zeolite or other molecular sieve precursors (particle size less than 100 nm), by deposition, e.g., by spin or dip-coating, or by in s

Layers comprising a molecular sieve layer on a porous or non-porous support, having uniform properties and allowing high flux are prepared from colloidal solutions of zeolite or other molecular sieve precursors (particle size less than 100 nm), by deposition, e.g., by spin or dip-coating, or by in situ crystallization.

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What is claimed is: 1. A supported inorganic layer comprising contiguous particles of a crystalline molecular sieve, the particles having a means particle size within the range of from 20 nm to 1 μm, wherein the support is selected from the group consisting of glass, fused quartz, silica, sili

What is claimed is: 1. A supported inorganic layer comprising contiguous particles of a crystalline molecular sieve, the particles having a means particle size within the range of from 20 nm to 1 μm, wherein the support is selected from the group consisting of glass, fused quartz, silica, silicon, clay, metal, porous glass, sintered porous metal, titania, and cordierite, and wherein the particle size distribution is such that at least 95% of the particles have a size within 짹33% of the mean. 2. A supported inorganic layer comprising contiguous particles of a crystalline molecular sieve, the particles having a mean particle size within the range of from 20 nm to 1 μm, wherein the support is selected from the group consisting of glass, fused quartz, silica, silicon, clay, metal, porous glass, sintered porous metal, titania, and cordierite, and wherein the layer primarily contains nanopores having size of between 1 and 10 nm. 3. A supported inorganic layer comprising contiguous particles of a crystalline molecular sieve, the particles having a mean particle size within the range of from 20 nm to 1 μm, wherein the support is selected from the group consisting of glass, fused quartz, silica, silicon, clay, metal, porous glass, sintered porous metal, titania, and cordierite, and wherein the layer primarily contains micropores having a size of between 0.2 and 1 nm. 4. A supported inorganic layer comprising contiguous particles of a crystalline molecular sieve, the particles having a mean particle size within the range of from 20 nm to 1 μm, wherein the support is selected from the group consisting of glass, fused quartz, silica, silicon, clay, metal, porous glass, sintered porous metal, titania, and cordierite, and wherein the layer comprises molecular sieve crystals in a particulate matrix, the pore structure being defined by the interstices between the particles, between the crystals, and between the particles and the crystals, the pore structure advantageously being between 0.2 and 1 nm in size. 5. A supported inorganic layer comprising contiguous particles of a crystalline molecular sieve, the particles hang a mean particle size within the range of from 20 nm to 1 μm, wherein the layer primarily contains nanopores 1 and 10 nm. 6. A supported inorganic layer comprising contiguous particles of a crystalline molecular sieve, the particles having a mean particle size within the range of from 20 nm to 1 μm, wherein the layer primarily contains micropores having a size of between 0.2 and 1 nm. 7. A layer as claimed in claim 6, wherein the layer comprises molecular sieve crystals in a particular matrix, the pore structure being defined by the interstices between the particles, between the crystals, and between the particles and the crystals.