Publication: Designing a hierarchical nanosheet ZSM-35 zeolite to realize more efficient ethanol synthesis from dimethyl ether and syngas
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Issued Date
2020
Resource Type
File Type
application/pdf
ISSN
9205861
Other identifier(s)
2-s2.0-85062145566
Rights Holder(s)
มหาวิทยาลัยศรีนครินทรวิโรฒ
Bibliographic Citation
Catalysis Today. Vol 343, (2020), p.206-214
Suggested Citation
Feng X., Zhang P., Fang Y., Charusiri W., Yao J., Gao X., Wei Q., Reubroycharoen P., Vitidsant T., Yoneyama Y., Yang G., Tsubaki N. Designing a hierarchical nanosheet ZSM-35 zeolite to realize more efficient ethanol synthesis from dimethyl ether and syngas. Catalysis Today. Vol 343, (2020), p.206-214. doi:10.1016/j.cattod.2019.02.054 Retrieved from: https://hdl.handle.net/20.500.14740/4642
Abstract
In this work, a dual-catalyst bed reactor packed with the combination of hierarchical nanosheet HZSM-35 (Hi-NZ35) zeolite and CuZnAl catalyst was proposed to realize more efficient ethanol synthesis from dimethyl ether (DME) and syngas (CO+H2). The nanosheet ZSM-35 (NZ35) zeolite was prepared via a direct hydrothermal synthesis route and the CuZnAl catalyst was prepared by co-precipitation method. Moreover, a series of Hi-NZ35x zeolites were obtained from NZ35 zeolite by further treatment with varied NaOH aqueous solution using hydrothermal process (“x” means the NaOH solution concentration of 0.2-0.6 M). The catalysts properties, such as crystallinity, porosity, acidity, morphology and composition, were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, NH3 temperature-programmed desorption (NH3-TPD), H2 temperature-programmed reduction (H2-TPR), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). It was found that Hi-NZ350.4 zeolite was more effective to obtain hierarchical porosity with mesopore volume up to 0.131 cm3 g−1. For single DME carbonylation reaction, the NZ35 zeolite exhibited superior catalytic activity (32.2%) and stability compared with conventional ZSM-35 (CZ35) zeolite. Furthermore, improved catalytic activity (42.0%) was observed on Hi-NZ350.4 zeolite owing to its abundant mesoporous structure. This result revealed that the hierarchical porosity of zeolite could effectively promote the catalytic performance of zeolite for DME carbonylation reaction. For the ethanol synthesis using the optimized catalysts combination of Hi-NZ350.4 zeolite and CuZnAl catalyst, the DME conversion was about 47.2% with higher ethanol productivity of 840.2 mmol kg−1 h−1. © 2019 Elsevier B.V.
Subject(s)
Aluminum alloys
Aluminum metallography
Ammonia
Carbonylation
Catalyst activity
Copper alloys
Copper metallography
Crystallinity
Energy dispersive spectroscopy
Ethanol
Ethers
Fuels
Nanosheets
Porosity
Precipitation (chemical)
Scanning electron microscopy
Sodium hydroxide
Synthesis gas
Temperature programmed desorption
Ternary alloys
Zeolites
Zinc alloys
Zinc metallography
Carbonylation reactions
Catalyst beds
Coprecipitation method
Direct hydrothermal synthesis
Energy dispersive spectroscopies (EDS)
H2 temperature-programmed reduction
Morphology and composition
Syn-gas
Hydrothermal synthesis
Aluminum metallography
Ammonia
Carbonylation
Catalyst activity
Copper alloys
Copper metallography
Crystallinity
Energy dispersive spectroscopy
Ethanol
Ethers
Fuels
Nanosheets
Porosity
Precipitation (chemical)
Scanning electron microscopy
Sodium hydroxide
Synthesis gas
Temperature programmed desorption
Ternary alloys
Zeolites
Zinc alloys
Zinc metallography
Carbonylation reactions
Catalyst beds
Coprecipitation method
Direct hydrothermal synthesis
Energy dispersive spectroscopies (EDS)
H2 temperature-programmed reduction
Morphology and composition
Syn-gas
Hydrothermal synthesis