Co/SiO2 catalysts for Fischer-Tropsch synthesis; effect of Co loading and support modification by TiO2
Co/SiO2 catalysts for Fischer-Tropsch synthesis; effect of Co loading and support modification by TiO2
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DOI：
10.1016/j.cattod.2012.05.042
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发表时间：
2012-12-15
期刊：
影响因子：
5.3
通讯作者：
Jaras, Sven
中科院分区：
文献类型：
--
作者：
Venezia, Anna Maria;La Parola, Valeria;Jaras, Sven
考察了钴负载量为6wt%和12wt%的两个系列催化剂上钴负载量和二氧化钛添加量对费托合成活性的影响。采用溶胶-凝胶法在酸性条件下制备了纯二氧化硅载体。TiO 2的改性是通过与异丙醇钛接枝来进行的。该催化剂通过在无定形SiO2和用TiO 2（5wt%）改性的SiO2上湿浸渍来制备。通过N2吸附-脱附分析、X射线衍射（XRD）、程序升温还原（TPR）和X射线光电子能谱（XPS）对样品进行了表征，并在483 K、20 bar和H2条件下进行了低温费托合成测试。CO = 2.1。讨论了含二氧化钛催化剂的转化率提高和SC 5+增加的原因，即钴和二氧化钛之间的相互作用更强，影响了氧化钴的还原性。(C)2012爱思唯尔有限公司版权所有。
The influence of cobalt loading and titania addition to the silica support on Fischer-Tropsch synthesis activity is investigated over two series of catalysts with Co loading of 6 wt% and 12 wt%. The pure silica support is prepared by sol-gel procedure in acid conditions. The modification by TiO2 is performed by grafting with titanium isopropoxide. The catalysts are prepared by wet-impregnation over amorphous SiO2 and over SiO2 modified by TiO2 (5 wt%). The samples, characterized by N-2-adsorption-desorption analyses, X-ray diffraction (XRD), temperature programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS), are tested in the low-temperature Fischer-Tropsch synthesis using the conditions of 483 K, 20 bar and H-2/CO = 2.1. The improved conversion rate and the increased SC5+ of the titania containing catalysts are discussed in terms of the stronger interaction between cobalt and titania affecting the cobalt oxide reducibility. (C) 2012 Elsevier B.V. All rights reserved.