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Preferential chemical vapor deposition of ruthenium on cobalt with highly enhanced activity and selectivity for Fischer–Tropsch synthesis

Paper ID Volume ID Publish Year Pages File Format Full-Text
39997 45842 2014 11 PDF Available
Title
Preferential chemical vapor deposition of ruthenium on cobalt with highly enhanced activity and selectivity for Fischer–Tropsch synthesis
Abstract

•Ru is preferentially deposited on Co of Co/γ-Al2O3 by CVD of ruthenocene for FTS.•As Ru in RuCo/γ-Al2O3 increases, SBET increases and dcobalt crystallites decreases.•Ru facilitates cobalt oxides reduction and suppresses cobalt aluminate formation.•Ru enhances up to 2.8 times CO conversion and 30% C5+ selectivity.

Various amount of ruthenium was preferentially deposited on cobalt of Co/γ-Al2O3 by chemical vapor deposition (CVD) of ruthenocene and compared with a CoRu/γ-Al2O3 catalyst prepared by the usual impregnation method for Fischer–Tropsch synthesis (FTS). The Co/γ-Al2O3 was prepared by wet impregnation of cobalt nitrate aqueous solution, and then dried and calcined at 400 °C for 4 h. Ruthenocene was sublimated, carried by argon, and then mixed with H2 and passed over γ-Al2O3 or calcined Co3O4/γ-Al2O3 catalyst at various temperatures. The effluent gasses were passed through a gas cell of FTIR to determine the ruthenocene thermo-chemical decomposition products. In a temperature range (window) of 150–200 °C the ruthenocene decomposes on Co3O4/γ-Al2O3 but not on γ-Al2O3. The catalysts were characterized by TPR, EDX, TEM, XRD and BET. The FTS activity and selectivity of the Ru-Co/γ-Al2O3 catalysts were investigated in a fixed bed microreactor. The preferential CVD of 0.3 wt% ruthenium onto 15.0 wt% Co/γ-Al2O3 (CoRu5-180) catalyst shifted both cobalt TPR peaks by about 120 °C to lower temperatures, showed about 2.8 times higher conversion, 30% more C5+ selectivity, and 30% less selectivity of methane. The CoRu5-180 catalyst showed about 81% higher CO conversion and 12% higher selectivity to C5+ than the same catalyst composition prepared by the used impregnation of ruthenium chloride onto the 15.0 wt% Co/γ-Al2O3.

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Keywords
Chemical vapor deposition; Ruthenium; Cobalt; Fischer–Tropsch synthesis
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Preferential chemical vapor deposition of ruthenium on cobalt with highly enhanced activity and selectivity for Fischer–Tropsch synthesis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 470, 30 January 2014, Pages 221–231
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
Full-text PDF Download
Online Support
Any Questions? feel free to contact us