Comparative study on the hydrogenation of naphthalene over both Al2O3‑supported Pd and NiMo catalysts against a novel LDH-derived Ni-MMO-supported Mo catalyst

Journal article


Claydon, R.M., Roman Ramirez, L. and Wood, J. (2021). Comparative study on the hydrogenation of naphthalene over both Al2O3‑supported Pd and NiMo catalysts against a novel LDH-derived Ni-MMO-supported Mo catalyst. ACS Omega. 6 (30), pp. 20053-20067. https://doi.org/10.1021/acsomega.1c03083
AuthorsClaydon, R.M., Roman Ramirez, L. and Wood, J.
Abstract

Naphthalene hydrogenation was studied over a novel Ni–Al-layered double hydroxide-derived Mo-doped mixed metal oxide (Mo-MMO), contrasted against bifunctional NiMo/Al2O3, and Pd-doped Al2O3 catalysts, the latter of which with Pd loadings of 1, 2, and 5 wt %. Reaction rate constants were derived from a pseudo-first-order kinetic pathway describing a two-step hydrogenation pathway to tetralin (k1) and decalin (k2). The Mo-MMO catalyst achieved comparable reaction rates to Pd2%/Al2O3 at double concentration. When using Pd5%/Al2O3, tetralin hydrogenation was favored over naphthalene hydrogenation culminating in a k2 value of 0.224 compared to a k1 value of 0.069. Ni- and Mo-based catalysts produced the most significant cis-decalin production, with Mo-MMO culminating at a cis/trans ratio of 0.62 as well as providing enhanced activity in naphthalene hydrogenation compared to NiMo/Al2O3. Consequently, Mo-MMO presents an opportunity to generate more alkyl naphthenes in subsequent hydrodecyclization reactions and therefore a higher cetane number in transport fuels. This is contrasted by a preferential production of trans-decalin observed when using all of the Al2O3-supported Pd catalysts, as a result of octalin intermediate orientations on the catalyst surface as a function of the electronic properties of Pd catalysts

Year2021
JournalACS Omega
Journal citation6 (30), pp. 20053-20067
PublisherACS Publications
ISSN 2470-1343
Digital Object Identifier (DOI)https://doi.org/10.1021/acsomega.1c03083
Web address (URL)https://pubs.acs.org/doi/10.1021/acsomega.1c03083
Publication dates
Print19 Jul 2021
Publication process dates
Accepted07 Jul 2021
Deposited26 Feb 2024
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Open
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