Rice husk ash (RHA) was used as support to synthesize MnOx/RHA catalyst by incipient wetness impregnation.The influence of preparation conditions on the activity of MnOx/RHA for catalytic oxidation of NO was investigated in a fixed bed reactor.The nature

surface species and morphology of the catalyst were analyzed by XRD

SEM

EDX and XRF.It was found that most of MnOx supported on RHA was micron-size particle in the form of amorphous phase.The preparation conditions except for calcination time had a significant effect on the activity of catalyst.With increasing calcination temperature

both the particles size of MnOx and the fraction of crystalline MnOx increased.When the calcination temperature was raised from 200℃ to 650℃

the particle size of MnOx was increased from 0.1 μm to 1.0 μm.The surface structure of RHA was determined by ashing temperature.With increasing ashing temperature

the surface structure changed from plate to honeycomb and filamentous.