期刊
APPLIED CATALYSIS A-GENERAL
卷 398, 期 1-2, 页码 168-178出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2011.03.037
关键词
Fischer-Tropsch synthesis; Co/ZrOx/SiO2; Liquid phase deposition method
资金
- Japan Society for the Promotion of Science (JSPS) [17106011]
Liquid phase deposition (LPD) method using (NH4)(2)ZrO(CO3)(2) was applied to modifying chemical nature of SiO2 surface with ZrOx species. ZrOx-modified SiO2 was then impregnated with Co nitrate solution for preparation of Co/ZrOx/SiO2 catalysts with 5 and 20 mass% Co loadings. Modification of SiO2 surface with ZrOx using the LPD method enhanced FTS activity of the CO/ZrOx/SiO2 catalysts under the reaction conditions of 503 K and 1.1 MPa. The LPD method was superior to other method reported previously such as impregnation and sol-gel methods in terms of surface modification of SiO2 with ZrOx. H-2-TPR, XRD and hydrogen chemisorption measurements revealed that modification of SiO2 surface with ZrOx using the LPD method enhanced dispersion of Co-0 without loss of high reducibility of Co. However, degree of Co-0 dispersion was less than that expected from enhancement of activity for the catalysts induced by ZrOx modification, indicating that turnover frequency (TOF) increased in the presence of ZrOx. This effect was particularly important for the catalyst with the low Co loading. Furthermore, in situ DRIFT measurement provided evidence for the formation of specific interaction of Co species with Si-OH and Zr-OH species in the Co/ZrOx/SiO2 catalysts. It was suggested that the formation of such specific interaction was responsible for not only enhancement of Co-0 dispersion but also increase in TOE of the ZrOx modified catalysts. (C) 2011 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据