Sustainable H<sub>2</sub> production from ethanol steam reforming over a macro-mesoporous Ni/Mg-Al-O catalytic monolith

doi:10.1007/s11705-013-1337-2

Front Chem Sci Eng

2013, Vol. 7

Issue (3) : 270-278 https://doi.org/10.1007/s11705-013-1337-2

RESEARCH ARTICLE

Sustainable H₂ production from ethanol steam reforming over a macro-mesoporous Ni/Mg-Al-O catalytic monolith

Ruixue GU¹, Guangming ZENG¹, Jingjing SHAO¹, Yuan LIU¹, Johannes W. Schwank², Yongdan LI(

)

1. Tianjin Key Laboratory of Applied Catalysis Science and Technology and State Key Laboratory for Chemical Engineering (Tianjin University), School of Chemical Engineering, Tianjin University, Tianjin 300072, China; 2. Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109-2136, USA

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Abstract

A macro-meso-porous monolithic Ni-based catalyst was prepared via an impregnation route using polystyrene foam as the template and then used in the steam reforming of ethanol to produce a H₂-rich gas. The Ni/Mg-Al catalyst has a hierarchically macro-meso-porous structure as indicated by photographs and scanning electron microscopy (SEM). The surface area of the catalyst was 230 m²?g^-1 and the Ni dispersion was 5.62%. Compared to the pelletized sample that was prepared without a template, the macro-meso-porous Ni/Mg-Al monolith exhibited superior reactivity in terms of H₂ production and also had lower CH₄ yields at 700oC and 800oC. Furthermore, the monolithic catalyst maintained excellent activity and H₂ selectivity after 100-h on-stream at 700^oC, as well as good resistance to coking and metal sintering.

Keywords macroporous Ni-based catalyst monolith hydrogen production ethanol steam reforming

Corresponding Author(s): LI Yongdan,Email:ydli@tju.edu.cn

Issue Date: 05 September 2013

Cite this article:

Ruixue GU,Guangming ZENG,Jingjing SHAO, et al. Sustainable H₂ production from ethanol steam reforming over a macro-mesoporous Ni/Mg-Al-O catalytic monolith[J]. Front Chem Sci Eng, 2013, 7(3): 270-278.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-013-1337-2
https://academic.hep.com.cn/fcse/EN/Y2013/V7/I3/270

Fig.1 Photographs of the monoliths (a) PS template, (b) AlO, (c) MgO-AlO, (d) sample 1

Fig.2 SEM images of PS template. Scale bars: 200 mm for (a) and 20 mm for (b)

Fig.3 SEM images of monolith materials (a) AlO, (b) MgO-AlO, (c) sample 1

Fig.4 XRD patterns of the monolithic AlO and MgO-AlO supports and sample 1 and sample 2 before reduction

Tab.1 Chemical composition, BET surface area, average pore size, pore volume, Ni dispersion and Ni surface area of the different materials

Fig.5 TPR profiles of the catalysts of sample 1 and sample 2

Tab.2 The product distribution after 21 h time-on-stream /mol·mol ethanol for different samples

Fig.6 CH yields during the ESR reaction at 700°C and 800°C as a function of time (1–, = reaction temperature)

Tab.3 Relative coke accumulated on sample 1 and sample 2 after reaction at different temperatures for 21 h

Fig.7 Stability test of the (a) sample 1 and (b) sample 2 ( = 700°C, HO/CHOH= 3, time= 100 h, flow rate of mixed solution= 4 mL?h)

Fig.8 TEM images of the used catalyst after reaction at 700°C for 100 h: (a) sample 1; (b) sample 2

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