Role of Active Phase in Fischer–Tropsch Synthesis: Experimental Evidence of CO Activation over Single-Phase Cobalt Catalysts

Journal Article · Fri Jul 13 04:00:00 EDT 2018 · ACS Catalysis

DOI:https://doi.org/10.1021/acscatal.8b00834· OSTI ID:1492546

Lyu, Shuai ^[1]; Wang, Li ^[1]; Zhang, Jianghao ^[2]; Liu, Chen ^[1]; Sun, Junming ^[2]; Peng, Bo ^[3]; Wang, Yong ^[4]; Rappé, Kenneth G. ^[3]; Zhang, Yuhua ^[1]; Li, Jinlin ^[1]; Nie, Lei ^[5]

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1. Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission &, Ministry of Education, College of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan 430074, People’s Republic of China
2. The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, Washington 99164, United States
3. Institute for Integrated Catalysis, Pacific Northwest National Laboratory 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, United States
4. The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, Washington 99164, United States; Institute for Integrated Catalysis, Pacific Northwest National Laboratory 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, United States
5. Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission &, Ministry of Education, College of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan 430074, People’s Republic of China; Institute for Integrated Catalysis, Pacific Northwest National Laboratory 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, United States

In order to understand the role of Co catalysts with different phases on Fischer-Tropsch synthesis, single-phase face-centered cubic (fcc) and hexagonal close-packed (hcp) Co were synthesized via a two-step approach, involving the formation of single-phase CoO materials followed by reduction in H2. The physicochemical properties of Co catalysts were thoroughly characterized by XRD, SEM, TEM, TPR and H2 chemisorption. It was found that hcp-Co exhibits higher activity on hydrocarbon formation than fcc-Co in Fischer-Tropsch synthesis. For both catalysts, CO dissociation was suggested as the rate determining step, on which hcp-Co presents ca. 40 kJ mol-1 lower activation energy than fcc-Co, in agreement of reported computational study. As a result, hcp-Co is concluded as a preferable phase for rational catalyst design.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1492546
• Report Number(s): PNNL-SA-136500
• Journal Information: ACS Catalysis, Journal Name: ACS Catalysis Journal Issue: 9 Vol. 8; ISSN 2155-5435
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: English