PREPARATION AND CATALYTIC PROPERTIES OF SiC FOAM SUPPORTED Co-BASED STRUCTURED CATALYSTS

doi:10.3724/SP.J.1037.2013.00662

Acta Metall Sin

2014, Vol. 50

Issue (6): 762-768 DOI: 10.3724/SP.J.1037.2013.00662

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PREPARATION AND CATALYTIC PROPERTIES OF SiC FOAM SUPPORTED Co-BASED STRUCTURED CATALYSTS

YANG Xiaodan, JIANG Chunhai, YANG Zhenming, ZHANG Jinsong

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Cite this article:

YANG Xiaodan, JIANG Chunhai, YANG Zhenming, ZHANG Jinsong. PREPARATION AND CATALYTIC PROPERTIES OF SiC FOAM SUPPORTED Co-BASED STRUCTURED CATALYSTS. Acta Metall Sin, 2014, 50(6): 762-768.

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Abstract

Co-based structured catalysts were prepared by coating Al-doped Co₃O₄ powder on SiC foam support using phenolic resin as the adhesion agent, followed by H₂ reduction at moderate temperatures. XRD, SEM, N₂ adsorption-desorption and H₂ adsorption measurement were used to characterize the evolution of crystalline size of Co particles, morphology and phase assemblage of the coatings and the H₂ adsorption capacities of the structured catalysts obtained at different reduction temperatures. The catalytic properties of the prepared Co-based structured catalysts were evaluated by taking the hydrolysis of NaBH₄ as the model hydrogen generation reaction. Growing of the active Co particles in the coating as accompanied by the increase of crystallinity was observed with the increase of reduction temperature, which resulted in decreased chemical adsorption capacity of H₂ at 120 ℃ and catalytic activity towards hydrogen generation rate. The highest hydrogen generation rate of 48.38 mL/(g·min)was achieved at the reduction temperature of 400 ℃.

Key words: structured catalyst sodium borohydride hydrolysis

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	Xiaodan YANG
	Chunhai JIANG
	Zhenming YANG
	Jinsong ZHANG

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00662 OR https://www.ams.org.cn/EN/Y2014/V50/I6/762

Fig.1 SEM image of the Co-based structural catalyst before reduction treatment

Fig.2 XRD spectra of SiC foam and the structured catalysts obtained at different reduction temperatures

(a) SiC foam (b) CA300 (c) CA400

(d) CA500 (e) CA600

Fig.3 XRD spectra of CoAlO powder (a) and the reduction products at 300 ℃ (b), 400 ℃ (c), 500 ℃ (d) and 600 ℃ (e)

Fig.4 Surface morphologies of the Co-based structured catalysts obtained at the reduction temperatures of 300 ℃ (a), 400 ℃ (b), 500 ℃ (c) and 600 ℃ (d)

Fig.5 Nitrogen adsorption and desorption curves of the synthesized CoAlO powder measured at 77 K (Inset presents the pore diameter distribution)

Fig.6 Hydrogen adsorption capacities on the Co-based structured catalysts prepared at the reduction temperatures of 300 ℃ (a), 400 ℃ (b), 500 ℃ (c) and 600 ℃ (d) as a function of pressure at 120 ℃

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