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OALib Journal期刊
ISSN: 2333-9721
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顺序浸渍法制备v-w/x（mn-ce-ti）/y（cu-ce-ti）/堇青石urea-scr催化剂及其性能研究
, PP. 1093-1101
Keywords: urea-scr,nox,v2o5-wo3/tio2,mn,cu
Abstract:
？用溶胶凝胶法制备了mn-ce/tio2（用m表示）和cu-ce/tio2（用c表示）催化剂，将m相、c相和v2o5-wo3（用v表示）用顺序浸渍法依次负载到堇青石蜂窝陶瓷载体（cc）上。用尿素选择性催化还原nox（scr）的转化率作为衡量指标对一系列的整体催化剂性能进行评价。催化剂的物理化学性能用n2吸附、co2-tpd、nh3-tpd、xrd、xps和h2-tpr等进行表征。结果表明，当m相优先于c相负载到cc上时，在0.01%so2和10%h2o存在的情况下，v/3c/3m/cc复合催化剂仍比c相或m相单独负载到堇青石上表现出较高的活性，并且微量的so2有利于催化剂活性的提升。xrd分析结果表明，cu-ce负载到tio2溶胶上有助于锐钛矿相的形成，mn-ce负载到tio2上有助于金红石相的形成。比表面积只与m或c相的负载量有关而与负载顺序无关。m或c相能够增加催化剂表面不同强度的酸性位。h2-tpr研究结果表明，v和cu或mn之间的相互作用提高了v的还原能力，进而增加了耗氢量。由xps分析可知，催化剂表面较高的v4+/v5+比值和大量化学吸附氧的存在有利于催化剂活性的提升。
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