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dc.contributor.authorMartinelli, Michela
dc.contributor.authorKaruturi, Sai Charan
dc.contributor.authorGarcia, Richard
dc.contributor.authorWatson, Caleb D.
dc.contributor.authorShafer, Wilson D.
dc.contributor.authorCronauer, Donald C.
dc.contributor.authorKropf, A. Jeremy
dc.contributor.authorMarshall, Christopher L.
dc.contributor.authorJacobs, Gary
dc.date.accessioned2021-04-19T15:18:54Z
dc.date.available2021-04-19T15:18:54Z
dc.date.issued3/17/2020
dc.identifierdoi: 10.3390/catal10030334
dc.identifier.citationCatalysts 10 (3): 334 (2020)
dc.identifier.urihttps://hdl.handle.net/20.500.12588/484
dc.description.abstractThe effect of cobalt substitution with nickel was investigated for the Fischer&ndash;Tropsch synthesis reaction. Catalysts having different Ni/Co ratios were prepared by aqueous incipient wetness co-impregnation, characterized, and tested using a continuously stirred tank reactor (CSTR) for more than 200 h. The addition of nickel did not significantly modify the morphological properties measured. XRD, STEM, and TPR-XANES results showed intimate contact between nickel and cobalt, strongly suggesting the formation of a Co-Ni solid oxide solution in each case. Moreover, TPR-XANES indicated that nickel addition improves the cobalt reducibility. This may be due to H<sub>2</sub> dissociation and spillover, but is more likely the results of a chemical effect of intimate contact between Co and Ni resulting in Co-Ni alloying after activation. FTS testing revealed a lower initial activity when nickel was added. However, CO conversion continuously increased with time on-stream until a steady-state value (34%&ndash;37% depending on Ni/Co ratio) was achieved, which was very close to the value observed for undoped Co/Al<sub>2</sub>O<sub>3</sub>. This trend suggests nickel can stabilize cobalt nanoparticles even at a lower weight percentage of Co. Currently, the cobalt price is 2.13 times the price of nickel. Thus, comparing the activity/price, the catalyst with a Ni/Co ratio of 25/75 has better performance than the unpromoted catalyst. Finally, nickel-promoted catalysts exhibited slightly higher initial selectivity for light hydrocarbons, but this difference typically diminished with time on-stream; once leveling off in conversion was achieved, the C<sub>5</sub>+ selectivities were similar (&asymp; 80%) for Ni/Co ratios up to 10/90, and only slightly lower (&asymp; 77%) at Ni/Co of 25/75.
dc.titleSubstitution of Co with Ni in Co/Al2O3 Catalysts for Fischer–Tropsch Synthesis
dc.date.updated2021-04-19T15:18:54Z


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