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The present invention provides a method for making a microporous ceramic material and includes the steps of (a) preparing a starting material for firing comprising a nonoxide ceramic precursor containing silicon as an essential component; (b) heating the starting material for firing in an atmosphere

The present invention provides a method for making a microporous ceramic material and includes the steps of (a) preparing a starting material for firing comprising a nonoxide ceramic precursor containing silicon as an essential component; (b) heating the starting material for firing in an atmosphere containing at least 1 mol % of hydrogen so as to form microporous ceramic product; and (c) cooling the microporous ceramic product.

대표청구항 ▼

What is claimed is: 1. A microporous ceramic product made by a process comprising: (a) preparing a starting material for firing comprising a polysilazane as a nonoxide ceramic precursor containing silicon as an essential component; (b) heating the starting material in an atmosphere containing at le

What is claimed is: 1. A microporous ceramic product made by a process comprising: (a) preparing a starting material for firing comprising a polysilazane as a nonoxide ceramic precursor containing silicon as an essential component; (b) heating the starting material in an atmosphere containing at least 10 mol % of H2 gas so as to form a microporous ceramic product; and (c) cooling the microporous ceramic product; wherein a maximum firing temperature in step (b) is set in the range of about 600째 C. to about 700째 C., the microporous ceramic product having a surface area in the range of about 50 m2/g to about 500 m2/g, having a pore volume of greater than 0.15 cm 3/g, and having a peak value of a pore size distribution according to the N2/Ar adsorption method in the range of 0.5 nm to 1.0 nm. 2. The microporous ceramic product according to claim 1, having a surface area of 400 m2/g or more and having a pore volume of about 0.2 cm3/g or more. 3. The microporous ceramic product according to claim 2, wherein the starting material is heated in an atmosphere containing at least 15 mol % of H2 gas and the maximum firing temperature is set in the range of 650짹20째 C. 4. A microporous ceramic product comprising a microporous ceramic support and a microporous ceramic film on the surface of the support, made by a process comprising: (a) preparing a starting material for firing comprising a polysilazane as a nonoxide ceramic precursor containing silicon as an essential component; (b) coating a surface of a microporous ceramic support with the starting material in order to form a coating film; (c) heating the support provided with the coating in an atmosphere containing at least 10 mol % of H2 gas so as to form a microporous ceramic product; and (d) cooling the microporous ceramic product; wherein a maximum firing temperature in step (c) is set in the range of about 600째 C. to about 700째 C., and a porosity of the support is 30% to 60%. 5. The microporous ceramic product according to claim 4, wherein a peak value of a pore size distribution or an average pore size according to the N2/Ar adsorption method of the support is about 0.01 μm to 10 μm. 6. The microporous ceramic product according to claim 5, wherein a peak value of a pore size distribution or an average pore size according to the N2/Ar adsorption method of the ceramic film is about 0.2 nm to 2 nm. 7. The microporous ceramic product according to claim 6, wherein a pore volume of the ceramic film is greater than 0.05 cm 3/g.