Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 106, Issue 3-4, Pages 423-432Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2011.05.050
Keywords
Glycerol oxidation; Glyceric acid; Pt/MWNTs; Base-free; Raman
Funding
- National Natural Science Foundation of China [21075139, 90610002]
- Natural Science Foundation of Zhejiang Province [Z406142]
- Ministry of Science and Technology of China [2007CB210207]
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Selective oxidation of glycerol with molecular oxygen was studied over different functionalized MWNTs supported Pt catalysts in base-free aqueous solution. N-2 adsorption, IR, Raman and SEM-EDS analysis confirmed that the tubular structure of MWNTs is stable during HNO3 and H2O2 pretreatment and the surface of MWNTs was successfully functionalized by HNO3, H2O2 and NH2-CH2-CH2-SH. XRD, SEM and TEM analysis demonstrated that unique sized Pt particles formed on S-pretreated MWNTs. Pt/S-MWNTs catalyst with small Pt particles was more active than Pt/MWNTs, Pt/HNO3-MWNTs and Pt/H2O2-MWNTs for glycerol oxidation in base-free aqueous solution. Free glyceric acid formed (with 68.3% selectivity and 90.4% conversion of glycerol) on Pt/S-MWNTs in base-free solution. While dihydroxyacetone formed firstly in an aqueous solution of NaOH/glycerol = 2:1 and the cleavage C-C bonds (catalyzed by alkali) arise severely. (C) 2011 Elsevier B.V. All rights reserved.
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