NGK Develops DDR-Type Zeolite Membranes for Isolation of Carbon Dioxide from Methane
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NGK Develops DDR-Type Zeolite Membranes for Isolation of Carbon Dioxide from Methane - JCN Newswire
NGK Develops DDR-Type Zeolite Membranes for Isolation of Carbon Dioxide from Methane

Tokyo, Mar 11, 2004 - (JCN Newswire) - NGK Insulators (TSE: 5333) has developed zeolite membranes that show a molecular sieving effect with nano size micropores. Zeolite membranes are formed by a hydrothermal synthesis process on a porous ceramic substrate to a thickness of about 5 mm. Using this new product, NGK has successfully isolated carbon dioxide from a mixture of methane and carbon dioxide.

Featuring extremely small micropores, the newly developed zeolite membranes have a crystal structure called DDR.* DDR-type zeolite membranes have oval-shaped micropores measuring 0.36 x 0.44 nm (1 nm = 1/1,000,000,000 of a meter). While carbon dioxide passes through these micropores due to its small molecular diameter, other larger molecules are blocked. The newly developed membranes have shown their best permeation performance with carbon dioxide, among various other gases.

Since DDR-type zeolite membranes offer the potential to extract carbon dioxide and increase the purity of methane from a mixture of these gases, they are expected to find applications in natural gas refining plants and in biogas plants that generate biogas from raw garbage using methane fermentation. Past research on the development of membranes for carbon dioxide selective sieving using organic polymer membranes ran up against certain difficulties in the industrialization of membranes, due to inadequate resistance to pressure, heat, and chemicals. NGK's zeolite membranes are expected to be free of such problems.

Zeolite is a silicate mineral composed of silicon, aluminum, and sodium. These elements combine three-dimensionally to form a mesh-like crystal structure presenting molecular-size micropores of about 0.3 to 0.8 nm that allow smaller particles to pass. Zeolite membranes are expected to be commercialized as molecular-sieving membranes.

NGK has already succeeded in developing MFI-type zeolite membranes capable of isolating xylene isomers. NGK's ceaseless R&D activities into more advanced inorganic molecular-sieving membranes has led to the world's-first development of DDR-type zeolite membranes.

* DDR (Deca-dodecasil 3R) type zeolite: synthetic zeolite composed of silicon and oxygen

About NGK Insulators

NGK Insulators, Ltd. was established in 1919. While the company is a leading insulator maker it is also engaged in diversified operations including the manufacture of other ceramic products/equipment,

Mar 11, 2004
Source: NGK Insulators

NGK Insulators (TSE: 5333)

From the Japan Corporate News Network
Topic: Research and development
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