Method for producing metal substrate for flue gas denitration catalyst
View Patent ↗A metal substrate for flue gas-denitration catalyst that, like SUS304, can be used without corroding is provided by improving the corrosion resistance of SUS430 substrate that is inexpensive and can easily be supplied stably. A method for producing the metal substrate for flue gas-denitration catalyst, wherein the method comprising the steps of: lath-processing a band-shaped steel plate made of ferrite stainless steel into a band-shaped metal lath; (1) degreasing process oil adhering to the metal lath; (2) passing the metal lath through a solution containing phosphoric acid and surfactant to load the solution; (3) draining off the excess solution; and (4) drying and heating the solution-loaded metal lath to react the phosphoric acid with the substrate, in which respective steps are carried out sequentially to form a film of phosphate compound on a surface of the substrate.
1. A method for producing a metal substrate for flue gas-denitration catalyst, wherein the method comprising the steps of:
(1) degreasing process oil adhering to a band-shaped metal lath wherein the metal lath is made of a band-shaped steel plate composed of ferrite stainless steel by lath-processing;
(2) passing the degreased metal lath through a solution containing phosphoric acid and surfactant to load the solution;
(3) draining off the excess solution; and
(4) drying and heating the solution-loaded metal lath to react the phosphoric acid with the metal lath,
wherein respective steps are carried out sequentially to form a film of phosphate compound on a surface of the metal lath.
2. The method according to claim 1 , wherein the ferrite stainless steel plate is SUS430 stainless band-shaped steel plate.
3. The method according to claim 1 , wherein the heating is performed at the temperature of 300 degrees C. or more.
4. The method according to claim 1 , wherein the thickness of the corrosion resistant phosphate compound film is not less than 1 μm.
5. A method for producing a flue gas-denitration catalyst comprising the steps of:
placing a paste of catalyst ingredient comprising titanium oxide as a main component onto the substrate obtained by the method according to claim 1 ;
passing the substrate between a pair of top and bottom rollers, applying the catalyst paste into the openings and onto the surface of the metal lath; and then
drying and firing the product obtained thereby.
6. A method for producing a metal substrate for flue gas-denitration catalyst, wherein the method comprising the steps of:
(1) degreasing process oil adhering to a band-shaped metal lath wherein the metal lath is made of a band-shaped steel plate composed of ferrite stainless steel by lath-processing;
(2) winding the degreased metal lath into a roll;
(3) passing the obtained roll through a solution containing phosphoric acid and surfactant to load the solution;
(4) draining off the solution by air blowing or by centrifugal force; and then
(5) drying and heating the roll to form a corrosion resistant film on the metal lath surface by reaction of the phosphoric acid and the metal lath.
7. The method according to claim 6 , wherein the ferrite stainless steel plate is SUS430 stainless band-shaped steel plate.
8. The method according to claim 6 , wherein the heating is performed at the temperature of 300 degrees C. or more.
9. The method according to claim 6 , wherein the thickness of the corrosion resistant film is not less than 1 μm.
10. A method for producing a flue gas-denitration catalyst comprising the steps of:
placing a paste of catalyst ingredient comprising titanium oxide as a main component onto the substrate obtained by the method according to claim 6 ;
passing the substrate between a pair of top and bottom rollers, applying the catalyst paste into the openings and onto the surface of the metal lath; and then
drying and firing the product obtained thereby.