Abstract:

In order to effectively remove the small-quantity CO in hydrogen-rich reformed gas, 4Ni-2Ru/ZrO₂ bimetallic catalyst was homogeneously coated on a microchannel reactor, and the method of selective methanation was used to purify CO. Then, the effects of calcination temperature, coating method, CTAB/Zr molar ratio and space velocity on the catalyst performance were investigated. Experimental results show that （1） when the calcination is performed at 350 ℃ after each slurry loading with a CTAB/Zr molar ratio of 0.35 and with a space velocity of 14286 h^{- 1}, 4Ni-2Ru/ZrO₂ catalyst is of excellent performance in low temperature, and the volume fraction of CO at the outlet reduces to 0. 0013 % at 260 ℃; and （2） a space velocity of 13000 -20000 h^{- 1} is suitable for the catalyst calcined at 350 ℃ after each slurry loading with a CTAB/Zr molar ratio of 0.35

Key words: CO purification, selective methanation, hydrogen-rich reformed gas, microchannel reactor