Pillared interlayered clay catalysts for the selective reduction

Details Pillared interlayered clay catalysts for the selective reduction Pillared interlayered clay catalysts for the selective reduction

1993-02-24

1995-05-16

Lewis, Michael

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

B01J 800

Patent

active

054158508

ABSTRACT:
Pillared interlayered clay catalysts (PILC) are formed and used in the selective reduction (SCR) of nitrogen oxides (NO.sub.x) in exhaust gases in the presence of ammonia. Cr.sub.2 O.sub.3 -PILC, Fe.sub.2 O.sub.3 PILC, TiO.sub.2 -PILC, ZrO.sub.2 -PILC and Al.sub.2 O.sub.3 -PILC each have considerable activities in the SCR of NO by NH.sub.3. Forming the catalysts in a bimodal pore structure provides increases poison resistance and increases reaction rates. Doping the catalyst with CeO.sub.2 and/or Ce.sub.2 O.sub.3 can promote increased activities. The PILC SCR catalysts do not oxidize SO.sub.2 to undesirable SO.sub.3 in any detectable amount.

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R. T. Yang et al. "Pillared Clays as Superior Catalysts for Selective Catalytic Reduction of NO with NH.sub.3 " in the Jun. 1992 issue of Ind. Eng. Chem. Res. pp. 1440-1445.

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