Ion-exchanged pillared clays: A new class of catalysts for selective catalytic reduction of NO by hydrocarbons and by ammonia

Journal Article · Fri Sep 01 04:00:00 EDT 1995 · Journal of Catalysis

OSTI ID:486299

Selective catalytic reduction (SCR) of NO by NH{sub 3} is presently performed with vanadia-based catalysts for flue gas applications. Hydrocarbons would be the preferred reducing agents over NH{sub 3} because of the practical problems associated with the use of NH{sub 3} (i.e., handling and slippage through the reactor). SCR of NO by hydrocarbons can also find important applications for lean-burn (i.e., O{sub 2}-rich) gasoline and diesel engines where the noble-metal three-way catalysts are not effective in the presence of excess oxygen. Pillared interlayered clays (PILCs) have been studied extensively for a number of catalyzed reactions. We have found high activities of PILCs for SCR of NO by NH{sub 3} (26.28). Pillared clays have considerable Bronsted acidity (27, 28), and the protons can be exchanged with metal cations. The Bronsted acidity of TiO{sub 2}-PILC, in particular, remains high after heat treatment at temperatures as high as 400{degrees}C (27-29). In this note, we report first results on the activities of cation-exchanged pillared clays for SCR of NO by both hydrocarbon and NH{sub 3}. 37 refs., 3 figs.

• DOE Contract Number: FG22-93PC93217
• OSTI ID: 486299
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 155; ISSN JCTLA5; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
02 PETROLEUM
36 MATERIALS SCIENCE
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
AMMONIA
AUTOMOTIVE FUELS
CHEMICAL REACTIONS
CLAYS
COMBUSTION PRODUCTS
FLUE GAS
NITRIC OXIDE
SELECTIVE CATALYTIC REDUCTION
SURFACE PROPERTIES