A　manganese　dioxide　(MnO2)/polypyrrole　(PPy)　nanocoating　was　uniformly　decorated　on　the　surface　of　polyphenylene　sulfide　(PPS)　filter　felt　via　an　in　situ　synthesis　method　to　fabricate　a　catalytic　filter　material.　The　pyrrole　functioned　as　a　dispersant　for　the　MnO2　catalysts　and　the　PPy　generated　acted　as　a　binder　to　adhere　the　MnO2　catalysts　and　filter　felt　together.　The　catalytic　filter　material　obtained,　had　a　high　adhesive　strength　between　that　of　the　MnO2/PPy　nanocoating　and　the　PPS　filter　felt,　and　was　used　for　the　selective　catalytic　reduction　of　nitric　oxide　(NO)　with　ammonia　under　model　conditions　without　any　sulfur　dioxide　or　water　vapor　in　the　gas.　More　than　70%　conversion　of　NO　was　achieved　at　160-180　degrees　C　at　a　high　space　velocity　of　38　000　h(-1).