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Effects of CeO2 addition on Ni/Al2O3 catalysts for the reaction of ammonia decomposition to hydrogen

Paper ID Volume ID Publish Year Pages File Format Full-Text
48356 46503 2008 8 PDF Available
Title
Effects of CeO2 addition on Ni/Al2O3 catalysts for the reaction of ammonia decomposition to hydrogen
Abstract

Effects of CeO2 addition on the catalytic performance of Ni/Al2O3 catalysts for ammonia decomposition to hydrogen were investigated by activity studies and some physico-chemical methods like N2-adsorption/-desorption, H2-chemisorption, X-ray diffraction (XRD), H2 temperature-programmed reduction (H2-TPR) and NH3 temperature-programmed surface reduction (NH3-TPSR). The results showed that the addition of CeO2 greatly improved the catalytic activity and stability of Ni/Al2O3 catalysts for ammonia decomposition to COx-free hydrogen. 98.3% NH3 conversion and 32.9 mmol/(min gcat) H2 formation rate were achieved over CeO2 promoted Ni/Al2O3 catalyst at 823 K and 30 000 ml/(h gcat) NH3 space velocity. The characterization results indicate that the addition of CeO2 enlarged the catalyst pores, moderated the interaction between Ni and alumnia, suppressed Ni0 crystallites from sintering, and improved the recombinative desorption of N adatoms from the Ni0 surface.

Keywords
Ni-based catalyst; CeO2 promotion; Hydrogen production; Ammonia decomposition
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Effects of CeO2 addition on Ni/Al2O3 catalysts for the reaction of ammonia decomposition to hydrogen
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 80, Issues 1–2, 15 April 2008, Pages 98–105
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