A large amount of effort has been directed towards the elimination of undesired atmospheric odours, particularly within buildings. Approaches adopted include sensory, chemical, biological and physical techniques [22e25]. Sensory techniques cannot provide an ultimate solution for the elimination of bad-smelling compounds, which only change our perception of the smell by using different smelling compounds. Physical deodorization eliminates smelling compounds through physical adsorption. Therefore, deodorizing capacity is rather limited and also the adsorbed compounds can be desorbed depending on the conditions. Chemical and biological methods can make these smelling compounds be converted into odourless end products. Various materials have been used as deodorants in those methods. The gases which are not effectively adsorbed using traditional air-purifying methods can be removed by oxidation if a suitable catalyst is available. Among them, metallo-phthalocyanine derivatives have received special attention [26].