Catalyst for reducing mercury, a mercury conversion unit, and an apparatus for measuring total mercury in combustion exhaust gas by using the same

Abstract

The present invention relates to a catalyst for reducing mercury, which comprises a reagent comprising any of the sulfites of potassium, sodium, calcium and magnesium, or any of the phosphates thereof, or a combination of them, as a main reagent of a catalyst component. And the present invention relates to the catalyst for reducing mercury, wherein the catalyst component is mixed with a different salt as an agent for inhibiting crystallization of the catalyst component.

What is claimed is: 
     
         1 . A method of reducing mercury in an exhaust gas with a catalyst comprising the steps of:
 providing a reagent comprising any of the sulfites of potassium, sodium, calcium and magnesium, or any of the phosphates thereof, or a combination of them, as a main reagent of a catalyst component;   heating the catalyst to a temperature of 300° C. to 500° C.;   applying a gas sample containing a mercury compound to the catalyst wherein the catalyst reduces Hg 2+  into Hg 0  with a temperature of 300° C. to 500° C.   
     
     
         2 . The method of reducing mercury in an exhaust gas with a catalyst according to  claim 1 , wherein the catalyst component is mixed with a different salt as an agent for inhibiting crystallization of the catalyst component. 
     
     
         3 . The method of reducing of mercury in an exhaust gas with a catalyst according to  claim 1 , wherein the catalyst component comprising the reagent as a main reagent is supported by a basic binder with an inorganic porous particle material as a carrier of the catalyst. 
     
     
         4 . The method of reducing mercury in an exhaust gas with a catalyst according to  claim 2 , wherein the catalyst component comprising the reagent as a main reagent is supported by a basic binder with an inorganic porous particle material as a carrier of the catalyst. 
     
     
         5 . The method of reducing mercury in an exhaust gas with a catalyst according to  claim 3 , wherein refractory and/or activated alumina is used as the inorganic porous particle material, and liquid glass and/or lithium silicate is used as the basic binder. 
     
     
         6 . The method of reducing mercury in an exhaust gas with a catalyst according to  claim 4 , wherein refractory and/or activated alumina is used as the inorganic porous particle material, and liquid glass and/or lithium silicate is used as the basic binder. 
     
     
         7 . An apparatus for measuring total mercury using the method of reducing mercury in an exhaust gas with a catalyst according to  claim 1 , which has the catalyst for reducing mercury in a part of a sample collection flow path, and after treatment, a sample is introduce into an ultraviolet absorption analyzer.