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Hydrotalcite supported Co catalysts for CO hydrogenation

Paper ID Volume ID Publish Year Pages File Format Full-Text
41684 45896 2011 10 PDF Available
Title
Hydrotalcite supported Co catalysts for CO hydrogenation
Abstract

It is well known that the catalytic performance of Co catalysts depends on supports and promoters. The focus of this work was to investigate the catalytic activities for CO hydrogenation of Co catalysts supported on the solid base, hydrotalcite (HT), and to probe the role of support in the reaction. A cobalt catalyst containing 10 wt% cobalt supported on HT was prepared using the incipient wetness impregnation method. Pre-calcined HT (CHT), alumina and magnesium oxide were also employed as supports for comparison purposes. Catalysts were characterized by surface area and porosity analysis, XRD, TEM/STEM/EDX, TPR and H2 chemisorption. The catalytic activity was tested using a fixed-bed reactor at 230 °C, 1.8 atm, and H2/CO = 2. It was found that the hydrotalcite supported catalyst showed the highest steady-state reaction rates. The activities of Co/HT reduced at different reduction temperatures (from 300 to 600 °C) were also compared. Reduction at 500 °C resulted in the highest activity; however, CH4 selectivity was also enhanced as the reduction temperature increased. The product distributions for Co/HT obeyed an Anderson–Schulz–Flory distribution. The α values were not impacted by the different reduction temperatures for Co/HT. The characterization and reactivity results suggest that the thermal stability properties of hydrotalcite, BET surface area, particle size of Co, the interaction between Co and the support, and the reducibility of Co were all important in governing the catalytic performance of the Co catalysts for CO hydrogenation. Our study suggests that HT is a promising support for Co for Fischer–Tropsch synthesis because it gives high activity (higher than Co/Al2O3) without the need for a reduction promoter.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (69 K)Download as PowerPoint slideResearch highlights► Co on hydrotalcite results in a highly active Fischer–Tropsch synthesis catalyst. ► Co/hydrotalcite exhibited higher activity for CO hydrogenation than Co/Al2O3. ► This high activity for Co/hydrotalcite does not require a reduction promoter. ► Co/HT exhibited its highest activity at an intermediate reduction temperature.

Keywords
Fischer–Tropsch synthesis; CO hydrogenation; Co catalysts; Hydrotalcite; MgO; Al2O3
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 396, Issues 1–2, 15 April 2011, Pages 91–100
Authors
, , , , ,
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