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The influence of surface functionalization of activated carbon on palladium dispersion and catalytic activity in hydrogen oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
43685 45982 2008 11 PDF Available
Title
The influence of surface functionalization of activated carbon on palladium dispersion and catalytic activity in hydrogen oxidation
Abstract

Stone-fruit activated carbon (SAC) and modified versions containing acidic oxygen and basic nitrogen groups have been used to prepare palladium catalysts by wet impregnation. Carbon supports and catalysts are investigated by thermo-gravimetric analysis, TPD, oxygen chemisorption, TEM and XPS. The influence of the nature of the functional groups on the dispersion and oxidation state of palladium and its activity in hydrogen oxidation is investigated. Pd dispersion is found to increase with the basic strength of functional groups on the support. XPS reveals that introduction of amine groups in SAC results in an increased proportion of Pd0, resistant to re-oxidation. Palladium catalysts supported on activated carbon modified by diethylamine groups are found to exhibit the highest metal dispersion and greatest activity in hydrogen oxidation.

Graphical abstractStone-fruit activated carbon functionalized with ethylamine groups facilitates higher Pd dispersions and catalytic activity in hydrogen oxidation than materials modified with NH3, H2O2, amide or HNO3.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Activated carbon; Surface functional groups; Surface amine groups; Palladium supported catalysts; Hydrogen oxidation; XPS
First Page Preview
The influence of surface functionalization of activated carbon on palladium dispersion and catalytic activity in hydrogen oxidation
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 335, Issue 2, 8 February 2008, Pages 241–251
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis