An inelastic neutron scattering study of the interaction of thiophene with a hydrodesulfurisation catalyst

Mitchell, Peter; Green, David A.; Payen, Edmond; Tomkinson, J.; Parker, Stewart F.

doi:10.1016/s0167-2991(00)80893-9

Cited by 1 publication

(6 citation statements)

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“…One is GUA interacting via H-bonding with the PILC (catalyst support), and the second is GUA interacting through chemisorption to molybdenum (metal active site). This is analogous with findings in cases for thiophene adsorbed on MoS 2 /alumina. , …”

Section: Resultssupporting

confidence: 88%

“…Adsorption of thiophene was also reported to be greater in a CoMoS 2 /alumina catalyst because of an enhanced interaction of the ring sulfur with the surface. 29 Based on the differences in the vibrational spectrum of GUA observed after the adsorption on the PILC, NiMoPR, and NiMoPS catalysts, and taking in consideration previous studies of GUA or thiophene adsorption on a CoMoS 2 /alumina catalyst, we propose that GUA was adsorbed via two types of interaction, as illustrated in Scheme 2. The first is GUA adsorbed via various types of H-bonding interaction.…”

Section: Resultsmentioning

confidence: 89%

“…The spectra are similar to those of free GUA, consistent with the IR spectra, demonstrating the H-bonding interaction of GUA on the catalyst surface. Adsorption of thiophene was also reported to be greater in a CoMoS 2 /alumina catalyst because of an enhanced interaction of the ring sulfur with the surface …”

Section: Resultsmentioning

confidence: 99%

“…Xu et al investigated the adsorption of phenol on oxides bearing different acid−base properties. 27 28,29 They investigated the adsorption mode of thiophene on aluminasupported MoS 2 and CoMoS 2 catalysts. Thiophene was found to be weakly chemisorbed on the catalyst, which thereby allows molecules to move across the surface to the catalytic site for further reaction with hydrogen atoms.…”

Section: Introductionmentioning

confidence: 99%

“…They found that compared to MgO and SiO 2 –Al 2 O 3 , phenate species were most stably formed on ZrO 2 , where both weak acid and base sites were present. Mitchell et al have exploited the advantages of vibrational spectroscopy with neutrons [inelastic neutron scattering (INS) spectroscopy] to study the closely related CoMo/Al 2 O 3 hydrodesulfurisation (HDS) catalysts. , They investigated the adsorption mode of thiophene on alumina-supported MoS 2 and CoMoS 2 catalysts. Thiophene was found to be weakly chemisorbed on the catalyst, which thereby allows molecules to move across the surface to the catalytic site for further reaction with hydrogen atoms.…”

Section: Introductionmentioning

confidence: 99%

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Hydrodeoxygenation of Guaiacol as a Bio-Oil Model Compound over Pillared Clay-Supported Nickel–Molybdenum Catalysts

et al. 2019

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Pillared clay-supported NiMo catalysts were synthesized in their reduced and sulfided forms and applied to the hydrodeoxygenation of guaiacol (2-methoxyphenol) as a bio-oil model compound. The sulfided catalyst displayed better activity and selectivity as compared to the reduced catalyst, yielding phenol as the major product. Quasielastic neutron scattering demonstrated that jump diffusion of guaiacol was seen after adsorption on both the sulfide catalyst and pillared clay. Inelastic neutron scattering was carried out in conjunction with an infrared study and reveal that there were two types of interaction of guaiacol with the catalyst. The first is guaiacol adsorbed via various types of H-bonding interaction, as observed in the sulfided catalyst. The second type of interaction is guaiacol adsorbed on the surface, presumably at a Mo vacant site, by chemisorption through formation of a methoxyphenate species as seen in the reduced catalyst. The interactions were greater in the sulfided catalyst by which guaiacol was selectively adsorbed in coordination with the Ni–Mo–S site.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%