Title: Preparation, characterisation and catalytic activity of gold nanoparticles supported on Co₃O₄

Authors: Tran Thi Minh Nguyet; Tran Que Chi; Quach Thi Hoang Yen; Nguyen Thi Toan; Nguyen Quoc Trung; Luu Tien Hung

Addresses: Institute of Material Sciences, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet Street, Cau Giay District, Hanoi City, Vietnam ' Institute of Material Sciences, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet Street, Cau Giay District, Hanoi City, Vietnam ' Institute of Material Sciences, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet Street, Cau Giay District, Hanoi City, Vietnam ' Institute of Material Sciences, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet Street, Cau Giay District, Hanoi City, Vietnam ' Institute of Material Sciences, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet Street, Cau Giay District, Hanoi City, Vietnam ' Vinh University, 182 Le Duan Street, Vinh City, Nghe An Province, Vietnam

Abstract: Gold nanoparticles supported on Co₃O₄ (Au:Co₃O₄ = 1:25) were prepared by co-precipitation method. The co-precipitate was studied by using a thermal analysis (Differential Thermal Analysis - DTA and a Differential Thermal Gravimetric Analysis - DTGA). The characterisations of the sample were investigated by using an X-ray Diffraction (XRD), a High-Resolution Transmission Electron Microscope (HRTEM) and a selected area electron diffraction (SAED). The particle size of gold pieces is less than 4.5 nm and more than 85% of the gold particles were smaller than 3.5 nm. The cobalt oxide Co₃O₄ has grain sizes in the range of 7-20 nm. The specific surface area was determined by Brunauer-Emmett-Teller method (BET) as 69 m²/g. The studies of catalytic properties showed that the total conversion temperature (T₁₀₀) for CO and C₃H₆ oxidation was relatively low at 27°C and 200°C, respectively. The catalyst having high activity for CO oxidation at ambient temperature could be a good candidate for environment treatment.

Keywords: co-precipitation; gold-based catalysts; gold nanoparticles; oxidation; total conversion; cobalt oxide; nanotechnology.

DOI: 10.1504/IJNT.2013.053146

International Journal of Nanotechnology, 2013 Vol.10 No.3/4, pp.334 - 342

Published online: 05 Apr 2013 *

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