A　series　of　MCM-41　molecular　sieves　with　different　molar　ratio　of　template　to　silicon　were　synthesized　through　hydrothermal　synthesis　method　by　using　cetyltrimethylammonium　bromide　(CTAB)　as　the　template,　diatomite　as　the　silicon　source.　By　using　impregnation　method,　the　Mn-Ce/MCM-41　SCR　molecular　sieve-based　catalysts　were　prepared.　The　results　observed　that　when　the　molar　ratio　of　template　to　silicon　was　0.2:1,　the　MCM-41　as　catalyst　carrier　has　the　highest　surface　area　and　largest　pore　volume,　it　also　presented　typically　ordered　hexagonal　arrays　of　uniform　channels.　The　denitration　catalytic　material　based　on　this　carrier　has　a　high　number　of　Lewis　acidic　sites,　and　the　denitration　efficiency　can　reach　more　than　93%.