MnO2-Fe2O3　catalysts　were　successfully　deposited　on　the　surface　of　polyphenylene　sulfide　(PPS)　filter　felt　by　a　redox　method,　and　the　as-obtained　catalytic　filter　material　was　tested　in　the　low-temperature　NH3-SCR.　NO　conversions　in　the　79.8-99.2%　range　at　140-180　degrees　C　and　a　gas　hourly　space　velocity　(GHSV)　of　120,000　cm(3)　g(-1)　h(-1)　were　obtained,　result　which　is　attributed　to　the　presence　of　amorphous　MnO2　and　Fe2O3　catalytic　phases.　The　formation　mechanism　of　the　MnO2-Fe2O3　catalyst　decorated　on　the　polyphenylene　sulfide　filter　felt　is　discussed.