Preparation and Properties of Bi-functional Catalysts (Cu-Co/X-MMT)

doi:10.11901/1005.3093.2023.493

Chinese Journal of Materials Research

2024, Vol. 38

Issue (11): 872-880 DOI: 10.11901/1005.3093.2023.493

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Preparation and Properties of Bi-functional Catalysts (Cu-Co/X-MMT)

LUO Hongxu, ZHAO Yonghua(

), ZHANG Jiakang, FENG Xiaoqian, ZHANG Qijian, WANG Huan

School of Chemistry & Environmental Engineering, Liaoning University of Technology, Jinzhou 121001, China

Cite this article:

LUO Hongxu, ZHAO Yonghua, ZHANG Jiakang, FENG Xiaoqian, ZHANG Qijian, WANG Huan. Preparation and Properties of Bi-functional Catalysts (Cu-Co/X-MMT). Chinese Journal of Materials Research, 2024, 38(11): 872-880.

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Abstract

A series of bi-functional catalysts (Cu-Co/X-MMT) were prepared via the impregnation method with oxide-pillared montmorillonite (X-MMT, X = SiO₂, Al₂O₃, ZrO₂, TiO₂) obtained from Na-montmorillonite (Na-MMT) as the solid acid, Cu as active component and Co as promoter. The acquired catalysts were characterized by XRD, N₂ adsorption-desorption at low temperature, NH₃-TPD, H₂-TPR, and XPS. The effect of different kinds of X-MMT on the steam reforming of dimethyl ether (SRD) reaction performance of the acquired bi-functional catalysts was investigated. The results show that the structure and acidity of X-MMT are significantly changed compared with Na-MMT, which is dependent on the type of oxide X, meanwhile, different X-MMT affects the particle size and reduction degree of copper, and thus influencing the SRD reaction performance of bi-functional catalysts. Among others, the Cu-Co/SiO₂-MMT bifunctional catalyst exhibits the best SRD performance, with the dimethyl ether conversion and H₂ yield reaching 80.3% and 57.3% under the conditions of 0.1 MPa, 350^oC and gas hour space velocity (GHSV) of 3000 mL/(g·h), respectively.

Key words: composite pillared montmorillonite dimethyl ether steam reforming hydrogen production

Received: 08 October 2023

ZTFLH:

O643.3

Fund: National Natural Science Foundation of China(22075120);Applied Basic Research Project of Liaoning Province(2023JH2/101300216)

Corresponding Authors: ZHAO Yonghua, Tel: (0416)4199013, E-mail: lgdzyh@163.com

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	LUO Hongxu
	ZHAO Yonghua
	ZHANG Jiakang
	FENG Xiaoqian
	ZHANG Qijian
	WANG Huan

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https://www.cjmr.org/EN/10.11901/1005.3093.2023.493 OR https://www.cjmr.org/EN/Y2024/V38/I11/872

Fig.1 XRD patterns of Cu-Co/X-MMT (a) Cu-Co/Na-MMT, (b) Cu-Co/SiO₂-MMT, (c) Cu-Co/Al₂O₃-MMT, (d) Cu-Co/ZrO₂-MMT, (e) Cu-Co/TiO₂-MMT

Fig.2 TEM of Cu-Co/X-MMT (a) Cu-Co/Na-MMT, (b) Cu-Co/SiO₂-MMT, (c) Cu-Co/Al₂O₃-MMT, (d) Cu-Co/ZrO₂-MMT

Fig.3 XRD patterns of reduced Cu-Co/X-MMT (a) Cu-Co/Na-MMT, (b) Cu-Co/SiO₂-MMT, (c) Cu-Co/Al₂O₃-MMT, (d) Cu-Co/ZrO₂-MMT, (e) Cu-Co/TiO₂-MMT

Table 1 Cu particle size of reduced catalysts

Fig.4 N₂ adsorption-desorption isotherms of different samples (a) Na-MMT, (b) SiO₂-MMT, (c) Al₂O₃-MMT, (d) ZrO₂-MMT, (e) TiO₂-MMT

Table 2 Structural characteristics of samples

Fig.5 NH₃-TPD profiles of samples (a) Na-MMT, (b) SiO₂-MMT, (c) Al₂O₃-MMT, (d) ZrO₂-MMT, (e) TiO₂-MMT

Fig.6 H₂-TPR profiles of Cu-Co/X-MMT (a) Cu-Co/Na-MMT, (b) Cu-Co/SiO₂-MMT, (c) Cu-Co/Al₂O₃-MMT, (d) Cu-Co/ZrO₂-MMT, (e) Cu-Co/TiO₂-MMT

Fig.7 Cu 2p XPS spectra of the reduced catalysts Cu-Co/Na-MMT (a), Cu-Co/SiO₂-MMT (b), Cu-Co/Al₂O₃-MMT (c), Cu-Co/ZrO₂-MMT (d), Cu-Co/TiO₂-MMT (e)

Fig.8 Cu LMM XAES of the reduced catalysts Cu-Co/Na-MMT (a), Cu-Co/SiO₂-MMT (b), Cu-Co/Al₂O₃-MMT (c), Cu-Co/ZrO₂-MMT (d), Cu-Co/TiO₂-MMT (e)

Table 3 Data of Cu LMM XAES peak of reduced catalyst

Fig.9 DME conversion (a) and H₂ yield (b) of Cu-Co/X-MMT (Reaction conditions: p = 0.1 MPa, T = 350^oC, GHSV = 3000 mL/(g·h))

Fig.10 Selectivity of the carbon-containing products over bifunctional catalysts

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