MUMBAI, India, Aug. 1 -- Intellectual Property India has published a patent application (202517053557 A) filed by Johnson Matthey Public Limited Company, London, on June 2, for 'method of making ceramic wall-flow filter substrate supporting porous on-wall coating.'
Inventor(s) include Bellham Peter; Chiffey Andrew Francis; Corrigan, Christopher; and Vidic Marko.
The application for the patent was published on Aug. 1, under issue no. 31/2025.
According to the abstract released by the Intellectual Property India: "A method of making a ceramic honeycomb wall-flow filter substrate supporting an on-wall coating, a fragment of which on-wall coated filter substrate analysed by mercury porosimetry has a volume of pores of 0.05 to 0.5 m diameter as a percentage of a mercury intrusion volume of the fragment of at least 15.0%, comprises the steps of: (i) preparing a slurry comprising water, a carboxylic acid, inorganic oxide particles or a mixture of two or more inorganic oxide particles having a D(v, 0.9) of 8 to 20 m; and 10 to 35 % by weight relative to 100% weight of the inorganic oxide particles of a particulate insoluble cellulose pore former of non-uniform morphology and having an equivalent spherical diameter D(v, 0.5) of 0.5 to 14 m and a modal aspect ratio (width/length) of 0.3 to 0.9; (ii) coating the slurry on at least first channels of the substrate, wherein the substrate has a mean pore size (D50) of 6 to 15 m prior to any coating and a porosity less than 60% prior to any coating; and (iii) drying and calcining the slurry-coated substrate, whereby sufficient slurry is coated on the substrate so that the product of step (iii) has a coating loading of 0.07 to 0.4 g/in3 (4.3 to 24.4 g/L), relative to a substrate weight prior to step (ii) and wherein a mean average on-wall coating thickness of the coated substrate is 5 to 70 m."
Disclaimer: Curated by HT Syndication.
