Abstract
The effect of crystal size on the durability of Co/HZSM-5 in the selective catalytic reduction (SCR) of NO with methane was studied. The durability of the catalysts subjected to hydrothermal treatment with a He stream containing 10% steam at 600 °C for 24 h. was investigated. After hydrothermal treatment, the decrease of catalytic activity for small crystal sizes of Co/HZSM-5(1.0 and 1.8 μm) was less than for large crystal sizes of Co/HZSM-5(5.6 and 7.6 μm). This infers that the durability of Co/HZSM-5 increased with a decrease in crystal size. Small crystal size catalyst showed a slight decrease in crystallinity and tetrahedral aluminum while the large crystal size catalyst lost crystallinity and tetrahedral aluminum. This indicated that the occurrence of framework dealumination was higher in the large crystal size catalyst.
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