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E?ect of Thermal Treatment on Structure and Catalytic Activity of Supported Fischer-Tropsch Nano-Cobalt Catalysts for Clean Fuels
Wei Chu*1, J. P Hong1, A.Khodakovb2, E. Payen2, X. Y. Dai1
1.Department of Chemical Engineering, Sichuan University, Chengdu 610065, China;2.Laboratoire de Catalyse de Lille, Universite des Sciences et Technologies de Lille, Cite Scientifique, 59655 Villeneuve d'Ascq, Lille, France
Abstract:
"A series of 15%Co/Al2O3 catalysts were prepared by incipient wetness impregnation under various calcination conditions (90-500 oC), and were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy experiments (XPS), temperature programmed reduction, and catalytic measurements of hydrogenation of carbon monoxide to long-chained hydrocarbons leading to clean fuels (Fischer-Tropsch synthesis). The results of XPS show the presence of incompletely decomposed cobalt nitrate for catalysts calcined at 90-200 oC, and the presence of Co3O4 for catalysts calcined at 200-500 oC. For the four alumina-supported nano cobalt catalysts with different thermal treatment (200-500 oC), XRD and XPS results illustrated that there were mainly nano Co3O4 crystalite phases of 9-10 nm and the size of cobalt nano-particles did almost not change with the different temperature of thermal treatment. This was different from that of silica-supported cobalt catalysts. The supported cobalt catalyst (CoAp340 sample) calcinated at 340 oC presented a better activity for Fischer Tropsch synthesis to clean fuels, at mild conditions like atmospheric pressure (100 kPa), 1800 mL/g/h and 190 oC; rather than high pressure (2 MPa or more)."
Key words:  Cobalt catalyst, Nano-cobalt particle, Fischer Tropsch synthesis, Reducibility, XPS, XRD, Cobalt species
FundProject:
费-托合成制清洁燃料用担载纳米钴基催化剂制备中热处理对其结构和催化性能的影响
储伟*1, 洪景萍1, A. Khodakov2, E. Payan2, 戴晓雁1
1.四川大学化工学院,成都610065;2.法国里尔科技大学,里尔催化研究实验室,
摘要:
" 应用浸渍法在不同的焙烧条件(90~500 ℃)制备了一系列Al2O3担载钴基催化剂(质量含量为15%);采用XRD、XPS、程序升温还原对其进行了结构表征和分析,考察其在一氧化碳选择加氢制备清洁燃料用长链烷烃的反应中的催化性能.XPS结果表明,对于在90~200 ℃焙烧的催化剂,仍可观察到未完全分解的硝酸钴的存在;对于在200~500 ℃焙烧的几个催化剂可观察到Co3O4的物相.对于经过几种热处理制备的氧化铝担载的四个纳米钴基催化剂(200~500 ℃热处理),XRD和XPS结果表明四个样品中主要是9
关键词:  钴基催化剂,纳米钴粒子,费-托合成,还原性能,XPS,XRD,钴物种
DOI:10.1088/1674-0068/20/06/743-747
分类号: