US 12,473,438 B2
Sequential pressurization treatment method to form a silver-silicalite coated substrate
B. Rabindran Jermy, Dammam (SA); and Vijaya Ravinayagam, Dammam (SA)
Assigned to Imam Abdulrahman Bin Faisal University, Dammam (SA)
Filed by Imam Abdulrahman Bin Faisal University, Dammam (SA)
Filed on Aug. 19, 2024, as Appl. No. 18/808,308.
Application 18/808,308 is a continuation of application No. 17/962,071, filed on Oct. 7, 2022, granted, now 12,110,419.
Prior Publication US 2024/0409759 A1, Dec. 12, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. C09D 7/40 (2018.01); C09D 1/00 (2006.01); C09D 5/08 (2006.01); C09D 5/14 (2006.01); C09D 7/61 (2018.01); C09D 7/63 (2018.01); C09D 171/02 (2006.01); C23C 18/12 (2006.01)
CPC C09D 7/67 (2018.01) [C09D 1/00 (2013.01); C09D 5/084 (2013.01); C09D 5/14 (2013.01); C09D 7/61 (2018.01); C09D 7/63 (2018.01); C09D 7/68 (2018.01); C09D 171/02 (2013.01); C23C 18/1212 (2013.01); C23C 18/1241 (2013.01); C23C 18/127 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method of making a silver-silicalite coating on a surface of a stainless-steel substrate, comprising:
mixing metakaolin with an aqueous solution of NaOH to form a first mixture;
mixing silica gel and silver nitrate with the first mixture to form a second mixture;
mixing ZSM-5 zeolite with the second mixture to form a third mixture; and
hydrothermally treating the stainless-steel substrate with the third mixture to form the silver-silicalite coating on the surface of the stainless-steel substrate,
wherein the hydrothermal treatment includes submerging the stainless-steel substrate in the third mixture, heating the stainless-steel substrate in the third mixture at a temperature range of 120 to 220° C. and sequentially pressuring to a pressure of up to 5 MPa and depressuring to ambient pressure,
wherein the silver-silicalite coating comprises rhombohedral cuboidal particles having an average length of 2 to 5 μm, an average width of 1 to 2 μm and an average height of 0.5 to 2 μm,
wherein the hydrothermal treatment is carried out in the absence of an organic template.