Effect of tungsten oxide addition on the catalytic activity of {gamma}-Al{sub 2}O{sub 3} for NO{sub x} reduction from fuel-lean gas mixtures

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie960163p· OSTI ID:419835

Kudla, R J; Subramanian, S; Chattha, M S; Hoost, T E ^[1]

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1. Ford Motor Co., Dearborn, MI (United States). Chemical Engineering Dept.

Non-zeolitic catalysts are increasingly being considered as durable alternatives in automotive lean-NO{sub x} catalysis. This study focused on increasing the acidity of {gamma}-Al{sub 2}O{sub 3} through the addition of tungsta (WO{sub 3}) and increasing the resulting catalytic activity using simulated lean-burn engine exhaust. The effects of WO{sub 3} loading, space velocity, catalyst temperature, hydrocarbon and sulfur dioxide concentrations, and hydrothermal aging on the NO{sub x} reduction activity of WO{sub 3}/Al{sub 2}O{sub 3} composite oxides were studied. It was found that tungsta-modified alumina compositions had higher NO{sub x} removal activity under lean-burn conditions than the unmodified {gamma}-Al{sub 2}O{sub 3}. Maximum NO{sub x} conversion occurred at a 1 wt% loading of WO{sub 3} on {gamma}-A/l{sub 2}O{sub 3} at a temperature of 580 C.

• OSTI ID: 419835
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 12 Vol. 35; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
54 ENVIRONMENTAL SCIENCES
ALUMINIUM OXIDES
CATALYTIC CONVERTERS
CATALYTIC EFFECTS
FUEL-AIR RATIO
NITROGEN OXIDES
PARAMETRIC ANALYSIS
SELECTIVE CATALYTIC REDUCTION
TUNGSTEN OXIDES