Portal de Periódicos da CAPES

Remarkable enhancement in durability of Pd/H-ZSM-5 zeolite catalysts for CH4-SCR

2000; Elsevier BV; Volume: 27; Issue: 4 Linguagem: Inglês

10.1016/s0926-3373(00)00136-3

1873-3883

Masaru Ogura, Susumu Kage, Masayoshi Hayashi, Masahiko Matsukata, Eiichi Kikuchi,

Industrial Gas Emission Control

Abstract Effect of second components on the catalytic performance of Pd/H-ZSM-5 zeolite (Pd: 0.4 wt.%) was evaluated by a durability test of NO reduction with CH4 at a relatively high temperature of 500°C in the presence of water vapor for a prolonged period. The Pd/H-ZSM-5 showed high stable activity for this reaction without H2O in the reactant feed, while immediate and irreversible deactivation was observed in the presence of H2O, resulting in no activity after 7 h. The second components such as Co, Rh, Ag, Ce, and Fe introduced individually to the Pd/H-ZSM-5 enhanced the durability, and in particular the addition of 3.3 wt.% Co led to a stable NO conversion for more than 40 h in the presence of H2O.