| Special pretreatment with Gas Smash Machine (GSM) forγ-Al2O3 is very effective way to enhance adherence to the ceramic and control character of the slurry through change of the particle size distribution.γ-Al2O3-b(showed in table 1) has high surface area and appropriate particle size distribution, which makes the slurry to own excellent adherence and fluidness. Fe and Mn are all prospective transfer metal for the selective catalytic reduction (SCR) of NOx with NH3 and more environmental, meanwhile, they can be added into alumina slurry directly during preparation of ceramic catalyst, which can save amount of work time and procedure. Under the preparation of monolithic catalyst, the conversion of NOx is 100% between 180-320℃, under the molar ratios of NOX/NH3=1.0, and GHSV is 5200 h"1.With the H2-TPR, NH3-TPD and situ DRIFTS, we have researched the oxide of active elements on the surface of catalysts, and absorption of reaction gas on catalysts. As Fe Substituted by Mn, the reduction peak in low temperature of MnOx has been transferred to lower region according to H2-TPR. Meanwhile, FeOx can improve absorption of NH3 to enhance SCR activity. From the situ DRIFTS, absorption of NOX is stronger than NH3 on the Fe1/Mn2-Al2O3, when the two reaction gas arrive at balance points on catalyst, its peak strength absorption of reaction gas is the highest on all catalysts, which also means it has the best conversion of NOX.
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