In this paper, pure-silica zeolite silicalite-1 was employed for NO catalytic oxidation, to enhance water resistance and sulfur tolerance. The influences of relative humidity (0%~100%), space velocity, O2 concentration (5%~20%) and SO2 concentration (0%~0.04%) were investigated, under 0.06% inlet NO concentration. Experimental results revealed that the NO oxidation conversion displayed little variation at 42% under 100% RH, though decreased from 56% to 42% as the relative humidity increased from 0% to 100%. Meanwhile SO2 concentration (0%~0.04%) had little impact on NO oxidation reaction. Silicalite-1 performed excellent active stability, water resistance and sulfur tolerance, as the NO oxidation conversion was maintained at 52% in 60h lifetime test, under 30℃, 0.06% NO, 0.01% SO2, 7200h-1SV and 100% RH.
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