Catalytic ammonia decomposition over CMK-3 supported Ru catalysts: Effects of surface treatments of supports
Date
2007
Authors
Li, L.
Zhu, Z.
Lu, G.
Yan, Z.
Qiao, S.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
Carbon, 2007; 45(1):11-20
Statement of Responsibility
L. Li, Z.H. Zhu, G.Q. Lu, Z.F. Yan, S.Z. Qiao
Conference Name
Abstract
CMK-3 carbon was used as a catalyst support for Ru catalyst for ammonia decomposition. The supports were treated with acid, and the effects of treatment on the properties of CMK-3 supports were studied by N<inf>2</inf> adsorption, XRD, XPS and mass titration. The chemical treatment of carbon support cause significant changes in carbon surface chemistry and in turn had significant effects on both catalyst dispersion and catalytic activity. It is found that the as-synthesized CMK-3 carbon is not a good catalyst support for this reaction. However, surface functional groups produced by acid treatments led to larger Ru catalyst particles, while alkali treatments made the Ru catalyst dispersion even worse due to the residue alkali or earth alkali metals. Interestingly, relatively larger Ru catalyst particles but still well dispersed in the channel of the mesoporous structures of the carbon improves NH<inf>3</inf> conversion into H<inf>2</inf>. This is determined by the chemical reaction rate-limiting step of ammonia decomposition. The catalytic activity follows the order: Ru-K/CMK-3 > Ru-Na/CMK-3 > Ru-Ca/CMK-3 > Ru-Cl/CMK-3 > Ru-SO<inf>4</inf>/CMK-3 > Ru-PO<inf>4</inf>/CMK-3 > Ru/CMK-3 > Ru-Li/CMK-3. CMK-3 is not a good carbon catalyst support due to its amorphous structure resulting in the poor electron conductivity. © 2006 Elsevier Ltd. All rights reserved.
School/Discipline
Dissertation Note
Provenance
Description
Access Status
Rights
Copyright © 2006 Elsevier Ltd. All rights reserved.