Ni^(2+)改性的Cu-ZSM-5催化分解NO的性能

Decomposition of NO over Ni^(2+) Modified Cu-ZSM-5 Catalysts

研究 Ni2 +改性的 Cu- ZSM- 5催化剂在无氧和有氧气氛下的 NO分解反应性能 ,考察 Ni2 +的加入量及加入方式对 Cu-ZSM- 5催化剂 NO分解活性的影响 .结果表明 ,先交换适量 Ni2 +再交换 Cu2 +的 Ni- Cu- ZSM- 5催化剂较单组分 Cu- ZSM- 5催化剂有较高的高温 (50 0℃～ 60 0℃ ) NO分解活性 .在含 5.5% O2 的反应气氛中 ,Ni- Cu- ZSM- 5在 50 0℃下的 NO分解率较之 Cu-ZSM- 5高出约 2 0 % ,Ni2 +的引入显著提高了催化剂的抗氧活性 .就 Ni2 +对 Cu- ZSM- 5催化剂的可能改性机制进行了讨论 .

This work dealt with the characteristics of Ni 2+ modified Cu ZSM 5 catalysts for NO direct decomposition with oxygen\|free and oxygen\|rich feed gases.The effects of Ni 2+ quantity and mode of exchange of Ni 2+ and Cu 2+ with ZSM 5 zeolites on NO decomposition were examined.It was found that Ni Cu ZSM 5 catalysts prepared by exchanging Ni 2+ first to a certain exchange level show significantly higher NO decomposition activities at high reaction temperature region (500℃～600℃) than ordinary Cu ZSM 5 catalysts.When reactant gas with 5 5% O 2 was used,NO decomposition percentage over Ni Cu ZSM 5 at 500℃ is about 20% higher than Cu ZSM 5.The possible modification mechanism of Ni 2+ for Cu ZSM 5 catalysts was discussed.