Method for surface treatment of honeycomb bodies with inorganic deposits

By using an aqueous mixture of atomized particles and a silane binder to form a robust inorganic deposition layer on the honeycomb filter body, the problem of pressure drop loss and efficiency improvement in existing technologies is solved, achieving high-efficiency filtration and low pressure drop.

CN121419952APending Publication Date: 2026-01-27CORNING INC
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Patent Information

Application Number
CN202380099569.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-06-30
Publication Date
2026-01-27

AI Technical Summary

Technical Problem

There is a lack of effective methods in the current technology to apply inorganic deposits to the body of a honeycomb filter, especially to improve filtration efficiency without causing pressure drop loss in the filter.

Method used

An aerosol stream is formed by atomizing particles with an aqueous mixture and using a silane binder. The aerosol is transported by a carrier gas and deposited on or in a porous wall. Subsequently, it is cured by heating to form aggregates, resulting in a robust inorganic deposition layer.

Benefits of technology

It significantly improves filtration efficiency while maintaining low pressure drop loss, and provides a durable inorganic surface treatment suitable for high-temperature environments.

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Abstract

A method for treating the surface of a plugged honeycomb body having porous walls is performed by atomizing an aqueous mixture of particles and a silane binder mixture to form an aerosol stream of aerosolized deposit precursors, the silane binder mixture of silane binder and water; and spray drying the aerosolized deposit precursor with a carrier gas to deliver the aerosolized deposit precursor toward the occluded honeycomb body. Water is removed from the wetting particles and / or the particle-containing droplets. At least some of the aerosolized deposit precursors form agglomerates comprised of the particles and the silane binder. The aqueous mixture is advantageously substantially free of carboxylic acids. The aerosolized deposit precursor may be a particle, a wetting particle, and / or a particle-containing droplet.
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Citation Information

Patent Citations

  • Methods of making honeycomb bodies having inorganic filtration deposits

    US20210347702A1

  • Methods of making honeycomb bodies having inorganic filtration deposits

    US20210354071A1

  • Method and system for identifying and repairing defective cells in a plugged honeycomb structure

    US7520918B2

  • Increasing and measuring filtration efficiency of a honeycomb body

    WO2022006768A1