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Nanosized Ru on high-surface-area superbasic ZrO2-KOH for efficient generation of hydrogen via ammonia decomposition

Paper ID Volume ID Publish Year Pages File Format Full-Text
44626 46046 2006 9 PDF Available
Title
Nanosized Ru on high-surface-area superbasic ZrO2-KOH for efficient generation of hydrogen via ammonia decomposition
Abstract

Amorphous superbasic ZrO2-KOH of high-surface-area was prepared by reflux-digestion of ZrO(OH)2 gel in aqueous KOH (0.5 M), followed by calcination at 873 K. Incipient wetness impregnation of the high-surface-area superbasic ZrO2-KOH with Ru acetylacetonate [Ru(acac)3] and RuCl3 (dissolved in ethanol), respectively, leads to nanosized Ru (2–7 nm) catalysts. We found that the Ru catalyst performs better when the Cl-free Ru precursor is adopted. Due to the high surface area and superbasicity of the support material, the Cl-free Ru/ZrO2-KOH catalyst is highly effective for the generation of COx-free hydrogen from NH3 decomposition. The high dispersion of Ru is related to the high surface area of ZrO2 and to the presence of K+. We deduce that the presence of Cl has direct as well as indirect (by weakening the promotional effect of KOH) effects on the electronic state of Ru nanoparticles. The apparent activation energy of ammonia decomposition on Cl-free Ru supported on the superbasic ZrO2-KOH is higher than that on conventional ZrO2. N2-TPD results disclosed that the superbasicity of the support material favors the combinative desorption of surface N atoms, a step generally regarded as the rate-determining in catalytic cycle of ammonia decomposition.

Keywords
Superbasic zirconia; Nanosized ruthenium catalyst; Ammonia decomposition; Hydrogen manufacture; Solid superbase; Promoter in catalysis
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Nanosized Ru on high-surface-area superbasic ZrO2-KOH for efficient generation of hydrogen via ammonia decomposition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 301, Issue 2, 24 February 2006, Pages 202–210
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
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Any Questions? feel free to contact us