Please use this identifier to cite or link to this item:
https://ir.swu.ac.th/jspui/handle/123456789/11990
Title: | Designing a hierarchical nanosheet ZSM-35 zeolite to realize more efficient ethanol synthesis from dimethyl ether and syngas |
Authors: | Feng X. Zhang P. Fang Y. Charusiri W. Yao J. Gao X. Wei Q. Reubroycharoen P. Vitidsant T. Yoneyama Y. Yang G. Tsubaki N. |
Keywords: | 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 |
Issue Date: | 2020 |
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. |
URI: | https://ir.swu.ac.th/jspui/handle/123456789/11990 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85062145566&doi=10.1016%2fj.cattod.2019.02.054&partnerID=40&md5=aaab5bcfdb678edc23a6b017d039a582 |
ISSN: | 9205861 |
Appears in Collections: | Scopus 1983-2021 |
Files in This Item:
There are no files associated with this item.
Items in SWU repository are protected by copyright, with all rights reserved, unless otherwise indicated.