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1. Introduction

Supported gold catalysts have many applications in ablating air pollutants, cleaning up H2 streams, and synthesizing fine chemicals [1-5]. Most gold catalysts are prepared by loading gold on oxide supports via deposition-precipitation and other methods. In addition to the size of gold nanoparticles, supports also play a key role in determining activity. It has been suggested that gold on reducible supports (e.g., TiO2, CeO2, Fe2O3) exhibits higher activity in CO oxidation than gold on non-reducible supports (e.g., Al2O3, SiO2) because the former can activate oxygen [6-8]. Nevertheless, properly prepared Au/Al2O3 [9-11] and Au/SiO2 [12-19] can also show high activities in CO oxidation.


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Although certain metal salts (e.g., sulfates, phosphates) are typical solid acid catalysts [20, 21], they have rarely been used to support gold nanoparticles. Lian et al. found that Au/BaCO3 is active for CO oxidation at room temperature, but it deactivates quickly on stream [22]. Venugopal et al. and Phonthammachai et al. reported that Au/Ca10(PO4)6(OH)2 catalysts show activity in water-gas shift and CO oxidation above 100 and 50 oC, respectively [23, 24]. Au/Ca10(PO4)6(OH)2 catalyst is also useful for the wet oxidation of organic compounds in aqueous media [25]. Our group recently communicated that gold nanoparticles supported on nanosized LaPO4 (6-8 nm) are active for CO oxidation below room temperature [26]. More recently, Li and coworkers developed Au/LaVO4 nanocomposite active for CO oxidation below 50 oC [27]. However, the knowledge on the use of metal salts as supports for gold nanoparticles is still quite limited.

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The previous work on Au/nano-LaPO4 [26] prompted us to raise further questions. Considering that there are numerous metal phosphates, is it possible to use metal phosphates other than LaPO4 to load gold nanoparticles? Are these metal phosphate-based catalysts active in CO oxidation, or is Au/nano-LaPO4 [26] a unique case? Are these phosphate-based gold catalysts stable on stream? In addition, considering that the homemade supports prepared using various methods under complicated conditions would lead to different particle sizes, crystal phases, morphologies, levels of residual ions from the synthesis mixture, and thus different catalytic performance, it is desirable to use commercially available supports for initial screening, while leaving the further optimization of catalysts the subject of further research.

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Herein, a number of commercial metal phosphates were used as supports for loading gold via a deposition-precipitation method. The catalytic performance in CO oxidation was studied following catalyst pretreatment in O2-He at 200 or 500 oC, and relevant characterization employing ICP-OES, BET, XRD, TEM, SEM, and H2-TPR was carried out. Interestingly, gold nanoparticles can be well dispersed on many of these metal phosphate supports and show significant activities at room temperature. Since many metal phosphates are useful in acid catalysis and selective oxidation [20, 28-32], Au/metal phosphates developed here may be useful for many other reactions to be explored in the future. In addition, gold on chemically distinct supports may provide new opportunities for fundamental studies to elucidate the nature of active sites and reaction mechanisms.

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[ Last edited by zhenmafudan on 2009-2-25 at 08:42 ]
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