Honeycomb structure and catalyst for cleaning exhaust gas using same, and method for producing catalyst for cleaning exhaust gas

Abstract

The present invention addresses the problem and purpose of providing a honeycomb structure that has a sufficiently high strength and is excellent in endurance, and a catalyst for cleaning an exhaust gas using the same that is excellent in resistance to sulfur oxide (SOX). The honeycomb structure of the present invention is one consists of a flat inorganic fiber sheet comprising an inorganic fiber sheet having supported thereon an inorganic binder and zeolite, and a corrugated inorganic fiber sheet comprising an inorganic fiber sheet having supported thereon the same inorganic binder and zeolite, which are alternately combined with each other, wherein it is characterized in that the zeolite has a particle diameter (i.e., a median particle diameter, D50) of from 0.5 to 10.0 μm.

1 . A honeycomb structure consisting of a flat inorganic fiber sheet comprising an inorganic fiber sheet having supported thereon an inorganic binder and zeolite, and a corrugated inorganic fiber sheet comprising an inorganic fiber sheet having supported thereon the same inorganic binder and zeolite, which are alternately combined with each other, wherein it is characterized in that the zeolite has a particle diameter (i.e., a median particle diameter, D50) of from 0.5 to 10.0 μm. 
     
     
         2 . The honeycomb structure according to  claim 1 , wherein it is characterized in that the inorganic fiber sheet is a glass fiber sheet. 
     
     
         3 . A catalyst for cleaning an exhaust gas using a honeycomb structure, wherein it is characterized in that it comprises a denitration catalyst component that is supported on the zeolite of the honeycomb structure according to  claim 1 . 
     
     
         4 . The catalyst for cleaning an exhaust gas using a honeycomb structure according to  claim 3 , wherein it is characterized in that the inorganic binder is formed of zirconia or alumina. 
     
     
         5 . The catalyst for cleaning an exhaust gas using a honeycomb structure according to  claim 3 , wherein the denitration catalyst component is bismuth. 
     
     
         6 . A method for producing the catalyst for cleaning an exhaust gas according to  claim 5 , comprising
 a step of supporting bismuth (Bi) on the zeolite,   in the step, bismuth (Bi) being dissolved in a solvent, the solvent used being a compound having one or more alkoxy group and one or more hydroxy group per molecule, a compound having two or more hydroxy groups per molecule, or an acid.   
     
     
         7 . A method for producing a catalyst for cleaning an exhaust gas comprising an inorganic fiber sheet having supported thereon an inorganic binder and zeolite, comprising
 a step of supporting bismuth (Bi) as a denitration catalyst component on the zeolite,   in the step, bismuth (Bi) being dissolved in a solvent, the solvent used being a compound having one or more alkoxy group and one or more hydroxy group per molecule, a compound having two or more hydroxy groups per molecule, or an acid.   
     
     
         8 . A catalyst for cleaning an exhaust gas using a honeycomb structure, wherein it is characterized in that it comprises a denitration catalyst component that is supported on the zeolite of the honeycomb structure according to  claim 2 . 
     
     
         9 . The catalyst for cleaning an exhaust gas using a honeycomb structure according to  claim 8 , wherein it is characterized in that the inorganic binder is formed of zirconia or alumina. 
     
     
         10 . The catalyst for cleaning an exhaust gas using a honeycomb structure according to  claim 8 , wherein the denitration catalyst component is bismuth. 
     
     
         11 . A method for producing the catalyst for cleaning an exhaust gas according to  claim 10 , comprising
 a step of supporting bismuth (Bi) on the zeolite,   in the step, bismuth (Bi) being dissolved in a solvent, the solvent used being a compound having one or more alkoxy group and one or more hydroxy group per molecule, a compound having two or more hydroxy groups per molecule, or an acid.