Hydrotreating of crude 2-ethylhexanol over Ni/Al₂O₃ catalysts: Surface Ni species-catalytic activity correlation

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• 作者：Renchun Yang ; Xiaogang Li ; Junsheng Wu ; Xin Zhang ; Zhihua Zhang ; Yufeng Cheng ; Jintao Guo
• 关键词：Ni/γ ; -Al₂O₃ ; Ni species ; Reducibility ; Hydrotreating ; 2-Ethylhexanol
• 刊名：Applied Catalysis A: General
• 出版年：2009
• 出版时间：31 October 2009
• 年：2009
• 卷：368
• 期：1-2
• 页码：105-112
• 全文大小：698 K

文摘

A series of supported Ni/γ-Al₂O₃ samples were prepared and then used to identify the surface Ni species. The samples were characterized by ICP-AES, XRD, TPR, and XPS. The results indicated that two types of Ni species occurred on the samples with Ni loading < 9.1 wt % , while four types of Ni species occurred on the samples with Ni loading > 9.1 wt % . The reduction temperatures around 350, 500–520, 620–650, and 750–800 °C corresponding to Ni species were related to amorphous NiO, crystal NiO, NiAl₂O₄, and NiAl_xO_y (x > 2), respectively. A correlation was made between the catalytic activities and the surface Ni species. For the catalysts that were difficult to reduce (Ni loading < 9.1 wt % ), the activities were very poor at low reduction temperatures; for the easily reducible catalysts (Ni loading > 9.1 wt % ), the activities were excellent in a wider reduction temperature range from 400 to 800 °C.