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Novel carbon-based Ni/Fe catalysts derived from peat for hot gas ammonia decomposition in an inert helium atmosphere

Paper ID Volume ID Publish Year Pages File Format Full-Text
42119 45911 2010 10 PDF Available
Title
Novel carbon-based Ni/Fe catalysts derived from peat for hot gas ammonia decomposition in an inert helium atmosphere
Abstract

Two novel carbon-based Ni/Fe catalysts were developed and tested for catalytic decomposition of ammonia into N2 and H2. These catalysts were prepared using a mesoporous activated carbon (AC) support derived from a Canadian peat by H3PO4 activation. The newly developed catalysts proved to be highly active for ammonia decomposition. The conversion of 2000 ppm NH3 diluted in helium over the Fe catalyst reached as high as 90% at 750 °C and at the space velocity of 45,000 h−1, compared with only about 15% with the activated carbon alone without metal loading. The new catalyst of Fe/AC was also much more active than the Fe catalyst supported on a commercial activated carbon reported previously. In addition, the new Fe/Ni catalysts showed superior performance with respect to their resistance to catalyst deactivation. Both catalysts remained active as the reaction time increased up to 10 h without showing a sign of deactivation. Fresh and spent catalysts were characterized by XRD and XPS. A cycle mechanism, involving both metal phosphides and metal nitrides, was proposed for the NH3 decomposition reactions over these new Fe/Ni catalysts.

Graphical abstractHighly effective mesoporous activated carbon (AC) supported Ni/Fe catalysts were developed for catalytic decomposition of ammonia into N2 and H2. A new cycle mechanism, involving both metal phosphides and metal nitrides, was proposed for the NH3 decomposition reactions over these carbon-supported Fe/Ni catalysts.Figure optionsDownload full-size imageDownload high-quality image (158 K)Download as PowerPoint slide

Keywords
Ammonia decomposition; Mesoporous carbon; Peat; Ni/AC; Fe/AC; Metal phosphides; Metal nitrides
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Novel carbon-based Ni/Fe catalysts derived from peat for hot gas ammonia decomposition in an inert helium atmosphere
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 375, Issue 1, 26 February 2010, Pages 124–133
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