Iron oxide and chromia supported on titania-pillared clay for selective catalytic reduction of nitric oxide with ammonia

摘要: TiO{sub 2}-pillard clay (PILC) with high surface area, large pore volume, and interlayer spacing was used as the support for mixed Fe{sub 2}O{sub 3} Cr{sub catalyst selective catalytic reduction (SCR) of NO NH{sub 3}. The Fe/Cr ratio varied at a fixed total amount oxide dopant 10% (wt). Fe-Cr/TiO{sub 2}-PILC Fe/Cr=3 showed highest activity. Compared commercial V{sub 5}/TiO{sub 2} catalysts, activity (on per gram basis) doped pillared approximately twice under H{sub 2}O- SO{sub 2}-free conditions 40% higher 2}O 2}. In addition, its oxidation only 20%-25% that 5}-based catalysts. TPD on both M=O M-OH (M=Fe or Cr) were necessary SCR reaction. situ IR spectra there Bronsted acidity than Lewis reaction existed direct correlation between among clays differentmore » ratios. These results, along transient response to O{sub 2}, indicated similar mechanism 5} operative. 2}-pillared also contributed Fe-Cr catalyst. pillars combined tetrahedral SiO{sub surfaces apparently gave rise dispersion 52 refs., 10 figs., 5 tabs.« less