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How Porous Ceramics Purify the Environment
2022-06-02

Porous Ceramics: Purifiers of the Environment

Environmental issues have become a major issue of increasing concern to the international community. The discharge of industrial wastewater and waste gas seriously affects people’s production and life. Porous ceramics have various excellent properties. It has a wide range of applications in the treatment of water pollution, air pollution, and the utilization of solid waste. There are many common areas between porous ceramic materials and environmental protection. It plays an extremely important role in environmental protection.

Porous ceramics have excellent thermal properties, mechanical properties, and chemical resistance, and are lightweight. It has been widely used in environmental protection in recent years. For example, various filters, catalytic carriers, sound-absorbing materials, lightweight building materials, thermal insulation materials, etc.

Porous Ceramics: used as catalyst substrates to degrade pollutants

Automotive exhaust gas purifiers often use thin-walled cordierite honeycomb ceramic catalyst substrates. The ceramic surface is coated with catalyst. It converts harmful components such as CO, HC, and NOx in vehicle exhaust into harmless CO2, H2O, and N2 through catalytic decomposition, meeting the national emission standards.

porous ceramics for environmental

The product has the properties of regular size, large specific surface area, fast thermal conductivity, high compressive strength, low thermal expansion coefficient, and good thermal stability.

The development of honeycomb ceramics and catalysts has made a great contribution to purifying automobile exhaust gas. Honeycomb ceramics for automobile exhaust purifiers require materials with low expansion coefficient and good temperature resistance, so cordierite is the preferred material. The catalysts are mostly composed of noble metals Pt, Rn, Pd, etc.

The porosity of cordierite honeycomb ceramics is generally 20% to 60%, and the standard porosity is 35%. Generally, there are two types of cordierite honeycomb mesh density: 400 mesh and 600 mesh. The wall thicknesses were 6 mils (150 μm) and 4 mils (100 μm). While the pore walls of cordierite honeycomb ceramics are developing towards thinning, the diameter is developing towards larger size. That is, the maximum diameter is developed from 100mm to 150mm and 300mm to improve efficiency and meet the purification needs of large exhaust volumes.

This large-scale cordierite honeycomb ceramic purifier has been applied to the exhaust gas of large trucks and diesel engines and is also suitable for exhaust gas purification of compressed natural gas (CNG) engines or ethanol engines.

Summarize:

The future development of porous ceramics will be oriented towards sustainable development. More use of renewable and more environmentally friendly raw materials. Develop multifunctional or extremely excellent specific functional porous ceramic materials for applications in the field of new energy and environmental protection. In addition, with the development of advanced manufacturing technology, such as the continuous maturity of additive manufacturing technology, the fine structure of porous ceramics will be able to achieve more precise control in the future. And firmly believe that the field of application will be further broadened.

SEFU is a porous ceramics manufacturer with many years of experience in production. SEFU porous ceramics can be used as catalyst substrates in automobile exhaust systems to contribute to the environmental protection industry. It can also be used as a ceramic filter in the foundry industry to filter slag from molten metal. Whether you are in the automotive environmental protection industry or the foundry industry, we can supply you with the most suitable products.