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NO/O2 and NO/C3H6/O2 reactions were investigated over barium hexaaluminogallate (Ba (Al, Ga)12O19 and BaCo (Al, Ga)11O19) with Al/Ga=9/3, 6/6 and 3/9 ratios. BaCo(Al, Ga)11O19 was synthesized by crystallization at 1100°C via the coprecipitation precursor powders prepared by aqueous metal nitrates and ammonium carbonate. The NOx conversion amount in the NO/O2 reaction over all hexaaluminogallates was less than 10%. The addition of C3H6 as a reductant gas significantly improved the NOx conversion over BaCo(Al, Ga)11O19 in excess oxygen compared with that in the case of Ba(Al, Ga)12O19. The Al/Ga ratio influenced the morphologies and catalytic activities of hexaaluminogallate powders. With increasing Al/Ga ratio, the NOx reduction with C3H6 to N2 increased up to 40% and 28% for BaCo(Al, Ga)11O19 powders and Ba(Al, Ga)12O19 powders, respectively. Highly dispersed Co species are effective in accelerating the NO activation step in selective reduction with C3H6.

DeNOx Properties of Barium Hexaaluminogallates.