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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/13502

Title: Green synthesis of platinum/gold bimetallic nanoparticles supported onto hydrotalcite surface as heterogeneous catalyst for selective oxidation of glycerol
Authors: Tongsakul, Duangta
Nishimura, Shun
Thammacharoen, Chuchaat
Ekgasit, Sanong
Ebitani, Kohki
Issue Date: 2011
Publisher: American Institute of Chemical Engineers
Magazine name: AIChE Annual Meeting Conference Proceedings
Start page: ID=228567
Abstract: Platinum/Gold bimetallic (Pt/Au) nanoparticles were successfully synthesized by green synthesis method in aqueous solution under mild condition using polysaccharide as a protecting agent as well as a reducing agent. The metal nanoparticles were supported on hydrotalcite (HT) surface by sol immobilization method and further utilized as heterogeneous catalyst. The surface morphology and compositions of supported platinum/gold (PtAu/HT) were analyzed by XRD and ICP-MS. The lattice parameter calculated from XRD diffraction pattern (111) of Pt_mAu_<100-m> exhibited linearly with their compositions only at low Pt concentrations (i.e., 20 and 40% Pt). However the result XRD pattern support that Pt/Au metal might be formed the partially alloy or partially phase segregation at high Pt concentrations, (i.e., 60, 80, and 90% Pt). The catalysis of Pt_mAu_<100-m>/HT (1 wt%) were evaluated for glycerol oxidation in base-free aqueous solution using molecular oxygen as an oxidant (glycerol/metal = 700 mol/mol). The moderate activities of Pt_mAu_<100-m>/HT also remain with increasing of Au amount to 20%, in addition, the increasing of Au amount more than this value resulting decreased of an activity. It is due to the Pt_mAu_<100-m>/HT particles size become larger with Au amount. However, the increasing of glycerol/metal ratio to 500 mol/mol was clearly seen that the presence of Au in Pt metal improved the selectivity toward glyceric acid, especially, Pt_<80>Au_<20>/HT catalyst. This phenomenon is explained by the synergistic effect of Pt/Au bimetallic resulting in the decreasing of the undesired product.
Rights: Copyright (C) 2011 Author(s). Duangta Tongsakul, Shun Nishimura, Chuchaat Thammacharoen, Sanong Ekgasit, Kohki Ebitani, AIChE Annual Meeting Conference Proceedings, 2011, ID=228567.
URI: http://hdl.handle.net/10119/13502
Material Type: publisher
Appears in Collections:c11-1. 会議発表論文 (Conference Papers)

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