期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 1, 页码 646-653出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b17520
关键词
metal-organic frameworks; dimethyl ether; ZrOSO4; methanol dehydration; solid acid catalyst
资金
- Ministry of Higher Education and Scientific Research (MHESR)
- Institutional Review Board (IRB) of the Faculty of Science in Assiut University, Egypt
Methanol dehydration process to dimethyl ether (DME) has been considered as one of the main routes to produce clean fuel, that is, DME. Thus, efficient catalysts are highly required for selective production of DME. Herein, UiO-66 was used as a precursor for the synthesis of zirconium oxide sulfate embedded carbon (ZrOSO4@C). The synthesis method involves a one-step carbonization of UiO-66 in the presence of sulfuric acid (10 wt %). Material characterizations using X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared, and Raman spectroscopy approve the formation of the high crystalline phase of ZrOSO4@C. Nitrogen adsorption-desorption isotherms and high-resolution transmission electron microscopy confirm the mesopore structure of the materials. Acidity analysis using pyridine temperature-programmed desorption and isopropanol dehydration corroborates that ZrOSO4@C has weak and intermediate acidic sites making ZrOSO4@C an effective catalyst for methanol dehydration to DME. The materials offered full conversion (100%) with excellent selectivity (100%) at a relatively low temperature (250 degrees C). The catalyst exhibited a long-term stability for 120 h. Based on these results, DME is produced efficiently in terms of conversion, selectivity, and long-term stability.
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