MTPP－CeO_x－SiO_2催化NO_x还原

Catalytic Reduction of NO_x on MTPP-CeO_x-SiO_2

在密闭循环反应器中，于２９０℃下研究了ＣＯ存在下催化剂ＭＴＰＰ－ＣｅＯ＿ｘ－ＳｉＯ＿２（Ｍ＝Ｃｏ￣（２＋）、Ｎｉ￣（２＋）、Ｃｕ￣（２＋））催化还原ＮＯ或Ｎ＿２Ｏ的反应。催化ＮＯ还原的活性顺序是ＮｉＴＰＰ＞ＣｏＴＰＰ＞ＣｕＴＰＰ，而Ｎ＿２Ｏ还原和ＮＯ深度还原为Ｎ＿２的顺序是ＮｉＴＰＰ＞ＣｕＴＰＰ＞ＣｏＴＰＰ。ＮＯ＿ｘ还原的催化特性和ＭＴＰＰ的电化学氧化机理有关（取决于中心金属或卟啉环被氧化的次序）。ＣＯ不仅还原ＮＯ＿ｘ而且还促进载体Ｃｅ＿２Ｏ＿３物种的形成。探讨了ＮＯ催化还原的机理。

The catalytic reduction of nitric oxide and nitrous oxide with carbonmonoxide is investigated over MTPO-CeO_x-SiO_2(M=Co￣(2+),Ni￣(2+),Cu￣(2+))at 290℃. The activi-ty order was as follows :NiTPP>CoTPP>CuTPP for reduction pf NO,NiTPP>CuTPP>CoTPP for reduction of N_2O and deep reduction of NO to N_2.The catalytic reduction behav-ior of NO_x is concerned with the electrochemical oxidation mechanism of MTPP(dependingon the order that central metal or porphyrin ring is oxidized).CO not only reduced NO_x butalso promoted the formation of support Ce_2O_3.The mechanism of the catalytic reduction ofNO is suggested.