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Ammonia formation over Pd/Al2O3 modified with cerium and barium

Paper ID Volume ID Publish Year Pages File Format Full-Text
53286 46961 2016 7 PDF Available
Title
Ammonia formation over Pd/Al2O3 modified with cerium and barium
Abstract

•Ce and Ba modified Pd/Al2O3 is promising for passive-SCR.•Ce addition increases water-gas-shift activity.•Ce allows temporary NH3 formation in slightly oxidizing global conditions.•Ba addition increases transient NH3 formation at high temperature.

We report experimental results for ammonia formation from nitric oxide and either a direct source of hydrogen or from a mixture of carbon monoxide and water over palladium based catalysts. Specifically, the addition of barium or cerium into an alumina supported palladium sample was studied. Static and transient flow reactor experiments were performed in order to identify the effects of temperature and the presence of oxygen on the activity for ammonia formation. Modification of Pd/Al2O3 with cerium proved to be beneficial for the activity due mainly to its enhancement of the water-gas-shift reaction, thus providing a higher availability of hydrogen for ammonia formation, but also because it remains active in the presence of slightly oxidizing global conditions when hydrogen is provided directly to the feed. Although the modification of Pd/Al2O3 with barium did not affect the ammonia formation during static conditions, the activity during lean/rich cycling increased. This is important for applications of passive selective catalytic reduction.

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Keywords
Catalytic exhaust aftertreatment; Passive-SCR; NOx reduction; NH3 formation
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Ammonia formation over Pd/Al2O3 modified with cerium and barium
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 267, 1 June 2016, Pages 210–216
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us