Direct Decomposition of N20 Emitted from Nitric Acid Plant Tail Gases Using Noble Metal Supported Mordenite-Zeolite Catalysts

摘要

Mordenite based catalysts for direct decomposition of N_2O have been successfully prepared and their direct decomposition performance characterized at the operating temperature of 300-400℃ commonly encountered in the nitric acid plants tail gases. The catalyst was prepared in 2 steps: 1. Precursor wet ion exchange, 2. Precursor impregnation. In addition to the previous contribution, it is shown here that the bimetallic Rh-, Pd-, Ir-Fe-MOR catalysts thus prepared exhibited an excellent N_2O decomposition performance: total conversion efficiency of Rh-Fe-MOR catalyst has been achieved at 400℃ and between 7500 h~(-1) and 10 000 h~(-1) space velocity.