Effect of Preparation Methods on Ni-distribution and Catalytic Performance of Foam Structured Catalyst Ni/Al2O3-SiC for Hydrogenation of Benzaldehyde

doi:10.11901/1005.3093.2018.317

Chinese Journal of Materials Research

2018, Vol. 32

Issue (11): 811-819 DOI: 10.11901/1005.3093.2018.317

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Effect of Preparation Methods on Ni-distribution and Catalytic Performance of Foam Structured Catalyst Ni/Al₂O₃-SiC for Hydrogenation of Benzaldehyde

Kai LI^1,², Yilai JIAO¹, Zhenming YANG¹, Jinsong ZHANG¹(

)

1 Shenyang National Research Center for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 University of Chinese Academy of Sciences, Beijing 100049, China

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Kai LI, Yilai JIAO, Zhenming YANG, Jinsong ZHANG. Effect of Preparation Methods on Ni-distribution and Catalytic Performance of Foam Structured Catalyst Ni/Al₂O₃-SiC for Hydrogenation of Benzaldehyde. Chinese Journal of Materials Research, 2018, 32(11): 811-819.

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Abstract

The foam structured catalysts of Ni/Al₂O₃-SiC were prepared via conventional impregnation (IM) and deposition-precipitation (DP) methods. These catalysts were characterized by means of scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), X-ray diffraction (XRD), N₂ absorption-desorption, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and H₂temperature-programmed reduction (H₂-TPR). The effect of preparation methods on the distribution, particle size and valence state of the active component Ni, as well as the interaction between Ni and the supporter was investigated. Furthermore, the catalytic performance of the catalysts prepared by different methods was evaluated for the liquid-phase hydrogenation of benzaldehyde. Results show that the Ni enrichment occurred on the coating surface of three catalysts prepared via impregnating and then dried in air at 40℃ and 160℃, as well as subjected to vacuum freeze-drying, respectively. The foam catalyst dried at 160℃ showed the most serious enrichment of Ni on the coating surface. Compared with the three impregnated foam catalysts, the catalyst prepared by DP method has a uniform Ni distribution and smaller Ni particles size, leading to its higher catalytic performance for hydrogenation of benzaldehyde.

Key words: inorganic non-metallic materials catalytic materials structured catalysts Al₂O₃ coating Ni distribution benzaldehyde hydrogenation

Received: 11 May 2018

ZTFLH:

TQ426

Fund: Supported by National Key Research & Development Program of China (No. 2017YFB0310405)

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	Zhenming YANG
	Jinsong ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.317 OR https://www.cjmr.org/EN/Y2018/V32/I11/811

Fig.1 Scheme of selective hydrogenation of benzaldehyde

Fig.2 SEM images of (A) SiC foam ceramic and (B) Al₂O₃-SiC foam structured support

Fig.3 SEM images and Ni distribution of the cross-section of the Ni/A₂₅S catalysts with different preparation methods. (A) Ni/A₂₅S (DP); (B) Ni/A₂₅S (IM-Freeze); (C) Ni/A₂₅S (IM-40); (D) Ni/A₂₅S (IM-160)

Fig.4 SEM images and Ni distribution of the coating surface of the Ni/A₂₅S catalysts with different preparation methods. (A) Ni/A₂₅S (DP); (B) Ni/A₂₅S (IM-Freeze); (C) Ni/A₂₅S (IM-40); (D) Ni/A₂₅S (IM-160)

Fig.5 XRD patterns of structured catalysts with different preparation methods

Table 1 Physical parameters of structured catalysts

Fig.6 TEM images of various structured catalysts: (A) Ni/A₂₅S (IM-40), (B) Ni/A₂₅S (IM-160), (C) Ni/A₂₅S (IM-Freeze) and (D) Ni/A₂₅S (DP)

Fig.7 XPS patterns of Ni 2p of structured catalysts with different preparation methods

Fig.8 H₂-TPR profiles of unreduced catalysts with different preparation methods

Fig.9 (A, B) catalytic performance of Ni/A₂₅S foam catalysts for hydrogenation of benzaldehyde as a function of reaction time. Reaction conditions: benzaldehyde 10 mL, isopropanol 140 mL, 90℃, 2 MPa H₂, stirring rate at 300 r/min

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