초록 ▼

Methods have been found to prepare fused silica capillary gas chromatographic columns where the stationary phase is a molecular sieve affixed to the silica capillary wall without the aid of an organic binder by modifying the interior surface of the silica prior to contact with the molecular sieve. T

Methods have been found to prepare fused silica capillary gas chromatographic columns where the stationary phase is a molecular sieve affixed to the silica capillary wall without the aid of an organic binder by modifying the interior surface of the silica prior to contact with the molecular sieve. These totally inorganic columns greatly expand the application and range of gas chromatographic separations and allow the use of non-traditional carrier gases, even air, while not degrading the separation of components. The columns are films of small molecular sieve particles affixed to a silica surface modified by such treatments as hydrogen peroxide, alumina deposition, or silica deposition followed by fixation at 80.degree.-160.degree. C.

대표청구항 ▼

[ What is claimed is:] [1.] A gas chromatographic column, characterized by the absence of an organic component, for separation of materials present in a gas stream comprising: a fused silica capillary with an inside diameter from about 50 up to about 750 microns; a film of a refractory inorganic oxi

[ What is claimed is:] [1.] A gas chromatographic column, characterized by the absence of an organic component, for separation of materials present in a gas stream comprising: a fused silica capillary with an inside diameter from about 50 up to about 750 microns; a film of a refractory inorganic oxide on the inner surface of the capillary and strongly adhering thereto; a film of molecular sieve particles deposited on and adhering to said film of refractory inorganic oxide; and an unobstructed passage along the axis of said capillary; where said film of molecular sieve particles has a thickness from about 0.5 to about 50 microns and said particles have an average diameter from about 0.1 to about 2 microns.