Enhancement of DME Formation from Methanol Dehydration by Doping CuO–ZnO–Al2O3 into H-form Zeolites

doi:10.1166/nnl.2016.2236

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Title:	Enhancement of DME Formation from Methanol Dehydration by Doping CuO–ZnO–Al2O3 into H-form Zeolites
Authors:	Lin, Chao-Lung Chiang；Kuen-Song
Keywords:	Carbon Dioxide；CuO-ZnO-Al2O3,；Dimethyl Ether,；Methanol Dehydration；XANES/EXAFS
Date:	2016/12/01
Issue Date:	2025-06-03 12:05:10 (UTC+8)
Publisher:	American Scientific Publishers
Abstract:	In this study, CuO–ZnO–Al2O3 (CZA) was prepared via co-precipitation with ultrasonic stirring, and then doped into protonated beta zeolite (HBZ) and protonated Y-type mesoporous zeolites (HYZ) to obtain CZA/HBZ and CZA/HYZ nanocatalysts for dimethyl ether (DME) synthesis via methanol dehydration. Moreover, the results of XRD, FE-SEM, nitrogen isotherm, H2-TPR, and XANES/EXAFS have demonstrated that CZA with effective structure and composition were prepared successfully. The crystal structures and morphologies of CZA/HBZ and CZA/HYZ nanocatalysts were confirmed and observed by the characteristic signals and morphologies of CZA and zeolites in XRD patterns and FE-SEM micro-images. Redox mechanisms of CuO in CZA/HBZ and CZA/HYZ nanocatalysts were investigated by H2-TPR spectra showing the significant decreases of γ-reductive peak that indicated the reduction of CuO nanoparticles. It was attributed to the welldispersion of CZA in HBZ and HYZ. Additionally, XANES and EXAFS spectra of CZA/HBZ and CZA/HYZ nanocatalysts revealed the existence of CuO and ZnO, and decrease of bond distances with oxygen (Cu/Zn–O), respectively. The signals of DME appeared at 1,455, 1,345, 1,187, and 917 cm–1 in the in-situ FTIR spectra, which revealed the formation of DME from methanol dehydration by using various CZA nanocatalysts. Finally, the methanol conversions, DME selectivities and yields of CZA nanocatalyst can be improved from 83.4, 82.1, and 60.2% to 85.4, 96.9, and 82.7%, respectively by doping CZA nanocatalyst into HYZ supporter.
Relation:	Nanoscience and Nanotechnology Letter 8(12), p.1072-1079
DOI:	10.1166/nnl.2016.2236
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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