淡江大學機構典藏:Item 987654321/127386
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    題名: Enhancement of DME Formation from Methanol Dehydration by Doping CuO–ZnO–Al2O3 into H-form Zeolites
    作者: Lin, Chao-Lung Chiang；Kuen-Song
    關鍵詞: Carbon Dioxide；CuO-ZnO-Al2O3,；Dimethyl Ether,；Methanol Dehydration；XANES/EXAFS
    日期: 2016/12/01
    上傳時間: 2025-06-03 12:05:10 (UTC+8)
    出版者: American Scientific Publishers
    摘要: 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.
    關聯: Nanoscience and Nanotechnology Letter 8(12), p.1072-1079
    DOI: 10.1166/nnl.2016.2236
    顯示於類別:[化學工程與材料工程學系暨研究所] 期刊論文

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