Gold Supported on Metal Oxides for Carbon Monoxide Oxidation

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Sónia Carabineiro (Author) FEUP; Bogdanchikova, N (Author) Other; Avalos Borja, M (Author) Other; Pestryakov, A (Author) Other; Tavares, PB (Author) Other; José Luis Figueiredo (Author) FEUP

Journal

Title: Nano Research

Vol. 4 No. 2

Pages: 180-193

ISSN: 1998-0124

Publisher: Tsinghua University Press

Indexing

ISI Web of Knowledge - 24 Citations

ISI Web of Science

Scopus - 24 Citations

Scientific classification

FOS: Engineering and technology > Nano-technology

CORDIS: Physical sciences > Chemistry > Heterogeneous catalysis

Other information

Authenticus ID: P-002-VAF

DOI: 10.1007/s12274-010-0068-7

Abstract (EN): Au has been loaded (1% wt.) on different commercial oxide supports (CuO, La2O3, Y2O3, NiO) by three different methods: double impregnation (DIM), liquid-phase reductive deposition (LPRD), and ultrasonication (US). Samples were characterised by N-2 adsorption at -196 degrees C, high-resolution transmission electron microscopy, selected area electron diffraction, energy dispersive X-ray spectrometry, high-angle annular dark-field imaging (Z-contrast), X-ray diffraction, and temperature programmed reduction. CO oxidation was used as a test reaction to compare the catalytic activities. The best results were obtained with Au loaded by DIM on the NiO support, with an activity of 7.2 x 10(-4) mol(CO).g(Au)(-1).s(-1) at room temperature. This is most likely related to the Au nanoparticle size being the smallest in this catalyst (average 4.8 nm), since it is well known that gold particle size determines the catalytic activity. Other samples, having larger Au particle sizes (in the 2-12 nm range, with average sizes ranging from 4.8 to 6.8 nm), showed lower activities. Nevertheless, all samples prepared by DIM had activities (from 1.1 x 10(-4) to 7.2 x 10(-4) mol(CO).g(Au)(-1).s(-1), at room temperature) above those reported in the literature for gold on similar oxide supports. Therefore, this method gives better results than the most usual methods of deposition-precipitation or co-precipitation.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 14