Research and improvement on the performance of Ti modified Mn based catalysts for removing ozone at room temperature
This study used in-situ growth of γ-Al2O3 layer on Al mesh and prepared structured Mn-Ti2.2/γ-Al2O3/Al catalyst to improve the dispersion of MnOx catalyst and its catalytic activity for remo-ving O3 at room temperature in high humidity environment.Based on the reaction performance of the MnTi2.2/γ-Al2O3/Al catalyst,the deactivation reasons of the catalyst were investigated through high hu-midity and high concentration O3 accelerated deactivation experiments,and structured MnTi2.2/γ-Al2O3/Al catalysts with excellent moisture resistance were selected.The results showed that the Mn-Ti2.2/γ-Al2O3/Al catalyst doped with Ti had a degradation conversion rate of nearly 100％at RH=50％,and a catalytic degradation performance of nearly 95％for O3 at RH=70％.When RH=90％,the catalytic performance could still be maintained at 54％.Through an accelerated deactivation test of 3 000 hours,it was found that the competitive adsorption of water molecules on the active sites of the MnTi2.2/γ-Al2O3/Al catalyst was the main reason for catalyst deactivation.External hydrophobic treat-ment of the MnTi2.2/γ-Al2O3/Al catalyst could effectively reduce the invasion of water molecules on the active sites of the catalyst,further enhancing the catalytic degradation performance of the catalyst under high humidity conditions.
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