Ammonia gas, sulfur dioxide gas and nitrogen dioxide gas removal filter

摘要

PROBLEM TO BE SOLVED: To provide a harmful gas removal filter exhibiting excellent removal effect to all of ammonia, sulfur oxide and nitrogen oxide.SOLUTION: Provided is a harmful gas removal filter characterized in that active carbon and/or silica gel mixed paper is carried with a layered double hydroxide in which the grain size lies in the range of 1 to 50 nm. Further, As the layered double hydroxide, one or more selected from hydrotalcite, manasseite and pyroaurite is preferable.SELECTED DRAWING: None