Product tunable behavior of carbon nanotubes-supported Ni?Fe catalysts for guaiacol hydrodeoxygenation

Fang, Huihuang, Zheng, Jianwei, Luo, Xiaolin, Du, Junmou, Roldan Martinez, Alberto ORCID: https://orcid.org/0000-0003-0353-9004, Leoni, Stefano ORCID: https://orcid.org/0000-0003-4078-1000 and Yuan, Youzhu 2017. Product tunable behavior of carbon nanotubes-supported Ni?Fe catalysts for guaiacol hydrodeoxygenation. Applied Catalysis A: General 529 , pp. 20-31. 10.1016/j.apcata.2016.10.011

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Abstract

Bimetallic Ni–Fe nanoparticles supported on carbon nanotubes (CNTs) are prepared and evaluated for the catalytic hydrodeoxygenation (HDO) of a lignin-derived model compound guaiacol. Appropriate combination of Ni and Fe affords high activity and significantly enhances selectivity to cyclohexane or phenol, whereas monometallic Ni and Fe catalysts display poor activities or selectivities. The product tunable behavior of guaiacol HDO is found to be dependent on Ni/Fe atomic ratios. Cyclohexane and phenol are the major products over Ni5–Fe1/CNT with Ni/Fe atomic ratio at 5/1 and Ni1–Fe5/CNT with Ni/Fe atomic ratio at 1/5, respectively. Characterization results confirm that Ni–Fe alloys are formed and elicit synergistic effects on the HDO performance. The selectivity-switchable performance of Ni–Fe/CNT can be assigned to the synergism between Ni domains, where H2 can be easily activated, and Fe domains, which exhibited strong oxophilicity. The bimetallic catalysts give an enhanced stability without significant sintering of metal nanoparticles, while the monometallic catalysts show obvious deactivation due to the agglomeration of metal nanoparticles. Further results reveal that the conversion of guaiacol depends on not only the chemical state but also the size of the metallic nanoparticles. The catalysts with appropriate Ni/Fe atomic ratio and smaller particle perform better hydrogenolysis of C–O bonds, resulting in high selectivity to cyclohexane or phenol.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Advanced Research Computing @ Cardiff (ARCCA) Cardiff Catalysis Institute (CCI) Chemistry
Subjects:	Q Science > QD Chemistry
Publisher:	Elsevier
ISSN:	0926-860X
Funders:	Natural Science Foundation of China
Date of First Compliant Deposit:	9 November 2016
Date of Acceptance:	12 October 2016
Last Modified:	14 Nov 2024 14:45
URI:	https://orca.cardiff.ac.uk/id/eprint/95940

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