钾促进的Co-Mn-Al混合氧化物催化剂上模拟废气中N2O的分解减排

Intrinsic data of N2O catalytic decomposition over a K-promoted Co-Mn-Al mixed oxide prepared by the thermal treatment of a layered double hydroxide was used for the design of a pilot reactor for the abatement of N2O emissions from the off-gases in HNO3 production.A pseudo-homogeneous one-dimensional model of an ideal plug flow reactor under an isothermal regime(450°C)was used for reactor design.A catalyst particle diameter of 3 mm is a compromise size because increasing the size of the catalyst particle leads to a decrease in the reaction rate because of an internal diffusion limitation,and particles with a smaller diameter cause a large pressure drop.A catalyst bed of 11.5 m 3 was estimated for the target N2O conversion of 90%upon the treatment of 30000 m 3 /h of exhaust gas(0.1 mol%N2O,0.005 mol% NO,0.9 mol%H2O,5 mol%O2)at 450°C and 130 kPa.