| 摘要 |
Filter material and method of removing oxides of nitrogen from gases and liquids A filter material based on a polyarylenethioether with recurring units of the formula -¢(Ar1)n-X)!m-¢(Ar2)i-Y)!j-¢(Ar3)k-Z)!1-¢(Ar4)o-W)!p- (I) in which Ar1, Ar2, Ar3, Ar4, W, X, Y and Z independently of one another are identical or different, the indices n, m, i, j, k, l, o and p independently of one another are zero or integers 1, 2, 3 or 4, the sum of which is at least 2, Ar1, Ar2, Ar3 and Ar4 are arylene systems of 6 to 18 carbon atoms and W, X, Y and Z are divalent linking groups selected from -SO2-, -S-, -SO-, -CO-, -O-, -CO2-or alkylene or alkylidene groups of 1 to 6 carbon atoms, for removing oxides of nitrogen (NOx) from gases or liquids. Also claimed is a method of removing oxides of nitrogen, in which an NOx-containing gas or a liquid is brought into contact with the abovementioned filter material and a chemical reaction occurs. Nitrogen monoxide can likewise be removed by adding to the filter material oxidative inorganic or organic compounds having an electron potential of greater than or equal to 0.96 V. |
