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Alkali hydroxide-modified Ru/γ-Al2O3 catalysts for ammonia decomposition

Paper ID Volume ID Publish Year Pages File Format Full-Text
39028 45801 2016 7 PDF Available
Title
Alkali hydroxide-modified Ru/γ-Al2O3 catalysts for ammonia decomposition
Abstract

•Ru/γ-Al2O3 catalysts are modified with alkali hydroxides to enhance ammonia decomposition.•Analysis by solid state NMR and XRD measurements showed basic modification of the support by aluminate formation.•LiOH modification with very high loadings showed the best results (6.5 times higher activity compared to unmodified catalyst) because of a high concentration of basic sites and a partial preservation of the support porosity.

We herein present an easy approach to increase drastically the catalytic activity of Ru/γ-Al2O3 catalysts in ammonia decomposition by surface modification with alkali hydroxides. The best activities have been achieved by a catalyst modification with lithium hydroxide in a Li/Al ratio of 1.7. In contrast, coatings with potassium and caesium hydroxide caused mass transfer limitations in the catalytic material already at low amounts (ratios alkali/Al <0.2–0.3). MAS ssNMR and XRD studies indicate the in-situ formation of alkali aluminates resulting in a basic modification of the support.

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Keywords
Ammonia decomposition; Ruthenium; Alkali doping; Support modification; Lithium aluminate
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Alkali hydroxide-modified Ru/γ-Al2O3 catalysts for ammonia decomposition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 510, 25 January 2016, Pages 189–195
Authors
, , , , ,
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
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