【摘要】 甲烷（CH₄）催化氧化可以有效处理液化天然气（LNG）船舶CH₄逃逸，但也催化氧化了尾气中的NO．为了研究LNG船舶CH₄氧化装置对选择性催化还原（SCR）系统的影响，基于自行搭建的脱硝试验平台，构建基于锰铈氧化物（Mn-Ce-O_x）催化剂与商业钒基催化剂的联合催化反应体系，研究了反应温度、催化剂种类、空速和杂质气体干扰对Mn-Ce-O_x催化氧化NO和促进催化还原NO_x的影响．结果表明：NO体积分数从0.05%升到0.20%、O₂体积分数从17.00%降到5.00%时，NO氧化效率小幅度降低．在脱硝效率方面，相同条件下Mn-Ce-O_x大幅度促进了SCR的脱硝效率，在反应温度为180℃、空速为21 356 h^-1且摩尔比n（NO）/n（NH₃）为1.0∶1.1时脱硝效率可以达到86.80%，并可以将整体催化剂体积降低50.7%，进而降低SCR系统的占用空间．更多还原

【Abstract】 Methane（CH₄） catalytic oxidation can effectively deal with CH₄ slip from liquefied natural gas（LNG）ships,but it also catalyzes the oxidation of NO in the exhaust gas.In order to study the impact of CH₄ oxidation unit on the selective catalytic reduction（SCR） system of LNG ships,a joint catalytic reaction system based on MnCe-O_x catalyst and commercial vanadium based catalyst was constructed on a self-built denitrification experimental platform.The effects of reaction temperature,catalyst type,space velocity and impurity gas interference on the catalytic oxidation of NO and catalytic reduction of NO_x by Mn-Ce-O_x were studied.The results indicate that,when the NO volume fraction is elevated from 0.05%to 0.20%and the O₂ volume fraction is decreased from 17.00%to5.00%,the oxidation efficiency of NO slightly declines.Under the same conditions,Mn-Ce-O_x significantly enhances the denitration efficiency of SCR.Under conditions of a reaction temperature of 180℃，a space velocity of21 356 h^-1 and a mole ratio n（NO）/n（NH₃） of 1.0∶1.1,the denitration efficiency can reach 86.80%,and the overall catalyst volume can be reduced by 50.7%,thereby reducing the occupied space of the SCR system.更多还原