ChemInform Abstract: Deactivation in CU‐ZSM‐5 Lean‐Burn Catalysts.

Abstract

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High‐Temperature Automotive Catalytic Nitrogen Oxide Reduction over Copper–Lanthanum–Alumina

“…The data with the maximum in a plot of NO removal efficiency versus temperature have been repeatedly reported for copper-zeolite catalysts. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] For such cases, the contribution of hydrocarbons that have been partially oxi-dized over copper species has been suggested for various catalysts, which shows the selective reduction of NO reduction at moderate temperatures. Our composite powder has the same NO-conversion-versus-temperature relation as that of zeolitebased catalysts.…”

“…1,2 Alternative copper ion-exchanged ZSM-5 zeolite was reported by Iwamoto et al 3 and tried for the application of diesel NOx removal. 4 Although this system has been extensively studied and tested by many researchers, [5][6][7][8][9][10][11][12][13][14][15] it unfortunately seems that zeolite-based catalysts have low stability under practical thermal and hydrothermal conditions. In general, engine operations varies over a wide range of A/F and temperatures in the range of 100°-1000°C.…”