CAJ | 학술논문

采用溶胶-凝胶法和过量浸渍法分别制备了粉末状及负载型La(1-x)SrxMnO3(x为0、0.2和0.4)催化剂，并用XRD、SEM 对其进行表征，以及检验负载型催化剂在无氧和有氧条件下催化甲烷脱硝的活性．结果表明，掺杂 Sr不会改变钙钛矿特有的晶型结构，并且在Sr摩尔分数为0.2时，催化剂还出现了多孔结构．同时La0.8,Sr0.2,MnO3和La0.6,Sr0.4,MnO3两种催化剂在无氧条件下都具有较好的活性，脱硝效率在800～900,℃条件下能够达到90%以上．在氧体积分数为6%时，La0.8,Sr0.2,MnO3在800,℃时具有较高的催化活性，脱硝效率仍达到80%，La0.6,Sr0.4,MnO3在高温区的催化活性则受到氧气存在的抑制．在有氧条件下，两种催化剂还能相应地提高500～600,℃下的脱硝效率．
채용용효-응효법화과량침지법분별제비료분말상급부재형La(1-x)SrxMnO3(x위0、0.2화0.4)최화제，병용XRD、SEM 대기진행표정，이급검험부재형최화제재무양화유양조건하최화갑완탈초적활성．결과표명，참잡 Sr불회개변개태광특유적정형결구，병차재Sr마이분수위0.2시，최화제환출현료다공결구．동시La0.8,Sr0.2,MnO3화La0.6,Sr0.4,MnO3량충최화제재무양조건하도구유교호적활성，탈초효솔재800～900,℃조건하능구체도90%이상．재양체적분수위6%시，La0.8,Sr0.2,MnO3재800,℃시구유교고적최화활성，탈초효솔잉체도80%，La0.6,Sr0.4,MnO3재고온구적최화활성칙수도양기존재적억제．재유양조건하，량충최화제환능상응지제고500～600,℃하적탈초효솔．
Powder perovskite-type La(1-x)SrxMnO3(x=0,0.2,0.4)were synthesized by sol-gel method,and supported La(1-x)SrxMnO3(x=0.2,0.4)were synthesized by excessive dipping method. The powders were characterized by XRD and SEM,and supported catalysts were then submitted to activity tests in the selective catalytic reduction(SCR)of NO by meth-ane with or without O2. The experimental results showed that the crystal structure of Sr-substituted samples was the charac-teristic perovskite structure,and what’s more,La0.8,Sr0.2,MnO3possessed a porous structure. In the absence of O2,the reduction of NOx by CH4 was performed over La0.8,Sr0.2,MnO3and La0.6,Sr0.4,MnO3,leading to a maximum of 90% at 800-900,℃. The catalytic performance of La0.8,Sr0.2,MnO3 could reach a maximum of 80% at 800,℃ with 6% O2,on the other hand,the performance of La0.6,Sr0.4,MnO3was suppressed by the presence of O2. The catalytic performance was improved by both La0.8,Sr0.2,MnO3and La0.6,Sr0.4,MnO3 at 500-600,℃.