Highly dispersed boron-nitride/CuOx-supported Au nanoparticles for catalytic CO oxidation at low temperatures

doi:10.1016/S1872-2067(20)63669-5

Abstract

Abstract:

Supported-Au catalysts show excellent activity in CO oxidation,where the nature of the support has a significant impact on catalytic activity. In this work,a hexagonal boron nitride (BN) support with a high surface area and adequately exposed edges was obtained by the ball-milling technique. Thereafter,impregnation of the BN support with Cu(NO3)2 followed by calcination under air at 400 °C yielded a CuO-modified support. After Au loading,the obtained Au-CuOx/BN catalyst exhibited high CO oxidation activity at low temperatures with a 50% CO conversion temperature (T50%) of 25 °C and a complete CO conversion temperature (T100%) of 80 °C,well within the operational temperature range of proton exchange membrane fuel cells. However,the CO oxidation activity of Au/BN,prepared without CuOx for comparison,was found to be relatively low. Our study reveals that BN alone disperses both Cu and Au nanoparticles well. However,Au nanoparticles on the surface of BN in the absence of CuO species tend to aggregate upon CO oxidation reactions. Conversely,Au nanoparticles supported on the surface of CuO-modified BN remain small with an average size of ~2.0 nm before and after CO oxidation. Moreover,electron transfer between Au and Cu species possibly favors the stabilization of highly dispersed Au nanoparticles on the BN surface and also enhances CO adsorption. Thus,our results demonstrate that thermally stable and conductive CuO-modified BN is an excellent support for the preparation of highly dispersed and stable Au catalysts.

Key words: Boron nitride, Au catalyst, CO oxidation, CuO, Electron transfer

Fan Wu, Lei He, Wen-Cui Li, Rao Lu, Yang Wang, An-Hui Lu. Highly dispersed boron-nitride/CuO_x-supported Au nanoparticles for catalytic CO oxidation at low temperatures[J]. Chinese Journal of Catalysis, 2021, 42(3): 388-395.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63669-5

https://www.cjcatal.com/EN/Y2021/V42/I3/388

Figures/Tables 5

Fig. 1. TEM images and particle-size distributions of Au/BN (a,c) and Au-CuOx/BN (b,d) catalysts.

Fig. 2. (a) XRD patterns of ball-milled BN,Au/BN,CuO/BN,and Au-CuOx/BN catalysts; (b) CO oxidation activities of ball-milled BN,CuO/BN,Au/BN,and Au-CuOx/BN catalysts with different Au loadings.

Fig. 3. TEM images and particle size distributions of Au/BN-used (a) and Au-CuOx/BN-used (b) catalysts; (c) XRD patterns of Au/BN-used and Au-CuOx/BN-used catalysts.

Fig. 4. (a) H2-TPR patterns of CuO/BN,Au/BN,and Au-CuOx/BN catalysts; (b) Au 4f XPS profiles; Cu 2p XPS profiles (c) and corresponding Cu LMM Auger electron spectra (d) of Au-CuOx/BN and CuO/BN catalysts.

Fig. 5. DRIFT spectra for CO adsorption over Au-CuOx/BN (a) and Au/BN (b) catalysts with nitrogen purging after CO adsorption saturation.

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