MTPP-CeO_x-SiO_2催化分解NO的研究

The Study of Catalytic Decomposition Reaction of Nitric Oxide on MTPP-CeO_-SiO_2

用密闭循环反应系统研究 MTPP-CeO_x-SiO_z(M=Co^(2+)、Ni^(2+)、Cu^(2+)催化分解No的性能。催化活性顺序是 NiTPP≈CoTPP>CuTPP。用原位 DRFTIRS 及 XPS 揭示了 MTPP-CeOx 催化分解NO经历了 NO 在中心金属上吸附活化的状态——M~* TPP(NO~*)。CeO_x 助催剂的电子给于性对改善 MTPP的催化活性起着关键作用。提出M~*TPP(NO~*)与气态或吸附在卟啉环上的NO分子形成二聚体中间过渡态的设想。

The catalytic decomposition of nitric oxide was investigated on MTPP-CeOx-SiO2 (M= Co2+ ,Ni2+,Cu2+)by a closed circulating reactor. The activity order of the metalloporphyrins used in the present work was as follows : NiTPP≈ CoTPP > CuTPP. A species activated, M TPP (NO ) ,of NO adsorbed on central metal was found by in-situ DRFTIRS and XPS. The supply electrons property of CeOx should play a key role in improvement of catalytic activity of MTPP. Dimeric transition state, that M TPP (NO) link with NO in gas phase or adsorbed on porphyrin rings, was supposed.