Influence of hematite morphology on the CO oxidation performance of Au/α-Fe2O3

doi:10.1016/S1872-2067(20)63687-7

Abstract

Abstract:

Controlling the interaction between metal nanoparticles and the support is a means to tune catalytic activity and stability. Herein we investigated the influence of the morphology of hematite on the performance of gold for CO oxidation. Nanosphere and nanorod forms of hematite, α-Fe₂O₃(S) and α-Fe₂O₃(R) respectively, were used to support gold nanoparticles. The surface of α-Fe₂O₃(R) was more corrugated than that of α-Fe₂O₃(S). These defects provide anchoring sites for gold nanoparticle deposition and stabilization. Due to the stronger gold-support interactions, Au/α-Fe₂O₃(R) contained smaller and more hemispherical gold particles than Au/α-Fe₂O₃(S). Au/α-Fe₂O₃(R) was not only more active in CO oxidation but also much more stable as evident from the small change in gold particle size during reaction. The higher reducibility of Au/α-Fe₂O₃(R) also contributed to the higher CO oxidation activity.

Key words: Gold, CO oxidation, Hematite, Morphology, Stability

Yanan Gao, Fu-Kuo Chiang, Shaojie Li, Long Zhang, Peng Wang, Emiel J. M. Hensen. Influence of hematite morphology on the CO oxidation performance of Au/α-Fe₂O₃[J]. Chinese Journal of Catalysis, 2021, 42(4): 658-665.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63687-7

https://www.cjcatal.com/EN/Y2021/V42/I4/658

Figures/Tables 11

Fig. 1. SEM images of α-Fe2O3(S), α-Fe2O3(R) and corresponding fresh gold catalysts.

Fig. 2. XRD patterns of α-Fe2O3(S), α-Fe2O3(R) and corresponding fresh gold catalysts.

Table 1 Physicochemical properties of Au/α-Fe2O3 catalysts.

Material	S_BET (m²/g)	[Au] ^a (wt%)	D_Au ^b (nm)	D_Au ^c (nm)
Au/α-Fe₂O₃(S)	26	1.01	2.0 ± 0.5	4.0 ± 1.8
Au/α-Fe₂O₃(R)	15	1.03	1.5 ± 0.3	2.4 ± 0.7

Fig. 3. TEM, HAADF-STEM images and gold particle size distribution of fresh Au/α-Fe2O3(S) (a-f) and Au/α-Fe2O3(R) (g-l) catalyst.

Fig. 4. CO oxidation activity (a) and Arrhenius plot (b) of α-Fe2O3(S) and α-Fe2O3(R). Reaction conditions: 50 mg sample, 1 vol% CO, 1 vol% O2 balanced with He, total flow rate 50 ml/min.

Fig. 5. CO oxidation activity of fresh Au/α-Fe2O3(S) and Au/α-Fe2O3(R). Pretreatment conditions: 50 ml/min He, 25 °C, 2 h; Reaction conditions: 50 mg catalyst, 1 vol% CO, 1 vol% O2 balanced with He, total flow rate 50 ml/min.

Fig. 6. Arrhenius plots of Au/α-Fe2O3(S) and Au/α-Fe2O3(R) in two reaction cycles in CO oxidation.

Fig. 7. Au 4f XPS spectra of different samples. (a) fresh Au/α-Fe2O3(S); (b) fresh Au/α-Fe2O3(R); (c) used Au/α-Fe2O3(S); (d) used Au/α-Fe2O3(R).

Fig. 8. Fe 2p XPS spectra of different samples. (a) fresh Au/α-Fe2O3(S); (b) fresh Au/α-Fe2O3(R); (c) used Au/α-Fe2O3(S); (d) used Au/α-Fe2O3(R).

Fig. 9. TEM and HAADF-STEM images of used Au/α-Fe2O3(S) (a-d) and Au/α-Fe2O3(R) (e-h) catalysts.

Fig. 10. H2-TPR spectra of fresh and used Au/α-Fe2O3 catalysts.

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Influence of hematite morphology on the CO oxidation performance of Au/α-Fe₂O₃

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