Alkali-modified HZSM-5 Zeolite/Cu-ZnO-Al2O3 Bifunctional Catalyst for Hydrogen Production via Steam Reforming of Dimethyl Ether

doi:10.11901/1005.3093.2024.239

Chinese Journal of Materials Research

2025, Vol. 39

Issue (4): 251-258 DOI: 10.11901/1005.3093.2024.239

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Alkali-modified HZSM-5 Zeolite/Cu-ZnO-Al₂O₃ Bifunctional Catalyst for Hydrogen Production via Steam Reforming of Dimethyl Ether

ZHANG Senhan, WANG Huan, ZHANG Jiakang, FENG Xiaoqian, ZHANG Qijian, ZHAO Yonghua(

)

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

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ZHANG Senhan, WANG Huan, ZHANG Jiakang, FENG Xiaoqian, ZHANG Qijian, ZHAO Yonghua. Alkali-modified HZSM-5 Zeolite/Cu-ZnO-Al₂O₃ Bifunctional Catalyst for Hydrogen Production via Steam Reforming of Dimethyl Ether. Chinese Journal of Materials Research, 2025, 39(4): 251-258.

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Abstract

A series of alkali-modified HZSM-5 zeolite were prepared via chemical treatment of the parent HZSM-5 with NaOH solution of different concentrations. And then, as solid acid, the alkali-modified HZSM-5 was physically mixed with commercial Cu-ZnO-Al₂O₃ to obtain bifunctional catalysts of HZSM-5 zeolite/Cu-ZnO-Al₂O₃ for steam reforming of dimethyl ether (SRD) reaction. The products were systematically characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), N₂ adsorption-desorption at low temperature, and NH₃ temperature-programmed desorption (NH₃-TPD) techniques. The results showed that the acidity and structure of the HZSM-5 could be effectively adjusted by altering the concentration of NaOH, and then affecting the SRD performance of the corresponding bifunctional catalyst. The bifunctional catalyst composed of the HZSM-5-0.4 treated by 0.4 mol/L NaOH and Cu-ZnO-Al₂O₃ exhibited the best SRD performance, i.e., the initial dimethyl ether conversion and H₂ yield reached 100% and 93% under the conditions of reaction temperature 350 ^oC, pressure 0.1 MPa, space velocity 3000 mL/(g·h), respectively, and dimethyl ether conversion and H₂ yield remained basically constant in 10 h, indicating that the catalyst had better stability.

Key words: composite alkali-modified HZSM-5 steam reforming dimethyl ether hydrogen production

Received: 27 May 2024

ZTFLH:

O643.3

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

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

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	ZHANG Senhan
	WANG Huan
	ZHANG Jiakang
	FENG Xiaoqian
	ZHANG Qijian
	ZHAO Yonghua

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.239 OR https://www.cjmr.org/EN/Y2025/V39/I4/251

Fig.1 XRD patterns of HZSM-5-m (a) HZSM-5, (b) HZSM-5-0.2, (c) HZSM-5-0.4, (d) HZSM-5-0.5

Samples	BET surface area / m²·g^-1	Pore volume / cm³·g^-1	Average pore size / nm	Relative crystallinity^a / %	I₅₄₆ / I $451 b$
HZSM-5	397	0.20	1.99	100	0.79
HZSM-5-0.2	353	0.34	2.86	85.8	0.41
HZSM-5-0.4	214	0.55	10.17	31.8	0.12
HZSM-5-0.5	71	0.79	16.34	4.3	0.01

Table 1 Structure and texture characteristics of HZSM-5-m

Fig.2 FT-IR spectra of HZSM-5-m (a) HZSM-5, (b) HZSM-5-0.2, (c) HZSM-5-0.4, (d) HZSM-5-0.5

Fig.3 N₂ adsorption-desorption isotherms of HZSM-5-m (a) HZSM-5, (b) HZSM-5-0.2, (c) HZSM-5-0.4, (d) HZSM-5-0.5

Fig.4 Pore size distributions of HZSM-5-m (a) HZSM-5, (b) HZSM-5-0.2, (c) HZSM-5-0.4, (d) HZSM-5-0.5

Fig.5 SEM photograph of HZSM-5-m (a) HZSM-5, (b) HZSM-5-0.2, (c) HZSM-5-0.4, (d) HZSM-5-0.5

Fig.6 NH₃-TPD spectra of HZSM-5-m (a) HZSM-5, (b) HZSM-5-0.2, (c) HZSM-5-0.4, (d) HZSM-5-0.5

Fig.7 DME conversation (A), H₂ yield (B) over HZSM-5-m/Cu-ZnO-Al₂O₃ bifunctional catalysts

Fig.8 Selectivity of the carbon-containing products over HZSM-5-m/Cu-ZnO-Al₂O₃ bifunctional catalysts

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