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Effect of surface oxygen containing groups on the catalytic activity of multi-walled carbon nanotube supported Pt catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
47076 46458 2010 10 PDF Available
Title
Effect of surface oxygen containing groups on the catalytic activity of multi-walled carbon nanotube supported Pt catalyst
Abstract

Multi-walled carbon nanotubes (MWNT) supported platinum catalysts were employed to study the support functionalization on their catalytic performances. The MWNT were subjected to HNO3 functionalization, in which oxygen containing groups (OCGs) were introduced to improve Pt dispersion. The MWNT supports were characterized by nitrogen physisorption and NEXAFS, and the Pt supported on differently functionalized MWNT characterized by X-ray absorption, TEM and both hydrogen and CO chemisorption. Compared to the as received MWNT supports, Pt dispersion is improved on the HNO3 treated MWNT supports, but the turnover frequency (TOF) of aqueous phase reforming decreases by half. The TOF can be recovered by removing the OCGs via high temperature annealing. To further investigate the OCGs effect, different probe reactions, including both steam reforming and liquid phase reforming of hydrocarbon oxygenates and dehydrogenation of alkanes in the liquid and gas phases, have been performed on the MWNT supported catalysts with different OCGs. A comparison of these reaction results suggests that OCGs are only detrimental to reactions in a binary mixture with two components of different hydrophilicity due to their competitive adsorption on the catalyst supports.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ After HNO3 reflux, oxygen containing groups are mostly on the outer surface of CNT. ▶ Oxygen containing groups on CNT deactivate reactions with binary reactants. ▶ The deactivation is from competitive adsorption of two components in the reactant. ▶ Oxygen containing groups also affect the metal particle size on CNT.

Keywords
Carbon nanotube supported catalyst; Aqueous phase reforming; Dehydrogenation; Competitive adsorption; Metal-support interaction
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Effect of surface oxygen containing groups on the catalytic activity of multi-walled carbon nanotube supported Pt catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 101, Issues 1–2, 22 November 2010, Pages 21–30
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