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Title: Catalytic activity of liquid phase prepared Cu-Zn-Al catalyst for CO hydrogenation in a fixed bed reactor
Authors: Luan, Chunhui
Zhang, Anrong
Wang, Xiaodong
Huang, Wei
Yin, Lihua
Keywords: Catalysts;Liquid phase catalysts;Fixed bed reactor;Carbon monoxide hydrogenation;Copper;Zinc;Aluminium
Issue Date: 8-Dec-2012
Abstract: Cu-Zn-Al catalyst prepared by a complete liquid phase technology for CO hydrogenation has been investigated in a fixed bed reactor in terms of catalytic performance and compared with catalysts prepared by a traditional method such as co-precipitation. The catalysts are characterized by XRD, NH3-TPD, H2-TPR and XPS. Results show that the activity of the liquid phase prepared catalyst is much lower in fixed bed reactor than in a slurry reactor. It was also much lower than that of the catalyst prepared by co-precipitation, although its stability is higher. XPS and XRD characterization reveal that there are obvious differences in the structure, morphology and surface state of the catalysts prepared by the two methods. In the catalyst prepared by liquid phase technology, Cu exists in the form of metallic Cu even though the catalyst is unreduced and there are more acid sites and more carbon on its surface than on the surface of the co-precipitation catalyst. It is concluded that there is a surface carbon film covering the liquid phase catalyst, and the carbon film is an important reason for the low activity when the catalyst is applied to fixed bed reactor. Coke burning off, an effective way for removing the surface carbon, improves the catalyst activity in a fixed reactor.
Page(s): 1663-1668
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.51A(12) [December 2012]

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