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Application of liquid phase deposition method for preparation of Co/ZrOx/SiO2 catalyst with enhanced Fischer–Tropsch synthesis activity: Importance of Co–Zr interaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
41608 45894 2011 11 PDF Available
Title
Application of liquid phase deposition method for preparation of Co/ZrOx/SiO2 catalyst with enhanced Fischer–Tropsch synthesis activity: Importance of Co–Zr interaction
Abstract

Liquid phase deposition (LPD) method using (NH4)2ZrO(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. H2-TPR, XRD and hydrogen chemisorption measurements revealed that modification of SiO2 surface with ZrOx using the LPD method enhanced dispersion of Co0 without loss of high reducibility of Co. However, degree of Co0 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 Co0 dispersion but also increase in TOF of the ZrOx modified catalysts.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (340 K)Download as PowerPoint slideHighlights► ZrOx modification of SiO2 by LPD method enhanced FTS activity of Co/ZrOx/SiO2. ► Activity enhancement reached 4.4-fold, which was larger than those of literatures. ► ZrOx modification enhanced both dispersion and turnover frequency of Co0 particles. ► Co species was interacted with both Si–OH and Zr–OH in the calcined Co/ZrOx/SiO2.

Keywords
Fischer–Tropsch synthesis; Co/ZrOx/SiO2; Liquid phase deposition method
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Application of liquid phase deposition method for preparation of Co/ZrOx/SiO2 catalyst with enhanced Fischer–Tropsch synthesis activity: Importance of Co–Zr interaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 398, Issues 1–2, 15 May 2011, Pages 168–178
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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Online Support
Any Questions? feel free to contact us