Abstract: A series of granular NiMo bulk catalysts with Ni/Mo molar ratio – 0.5–2.0, and alumina as a binder was prepared by the spray drying of Ni-Mo-citrate solution followed by calcination, plasticizing and granulation. The samples were characterized by a variety of techniques (N2 physisorption, XRD, UV–vis DRS, IR spectroscopy, STEM, EDS and XPS). The catalytic activity was evaluated in the hydrotreating of SRVGO, carried out in a fixed bed reactor at P = 5.0 MPa, volume ratio H2/SRVGO = 600 Nm3/m3, WHSV = 1.5 h−1, T1 = 360 °C, T2 = 380 °C. The investigation techniques data show that the catalysts with low Ni/Mo molar ratio contain amorphous phases, AlOOH and crystal NiMoO4. After sulfiding, it results in the formation of bulk spherical particles of MoS2 and some MoS2 being distributed over alumina binder in sulfide catalysts. Ni is distributed on the inner part of the formed MoS2 or as NiMoS phase. When Ni content increases, the catalysts mostly contain amorphous Ni-Mo phase and some crystallite Mo-containing phase (Ni/Mo molar ratio of 2), spherical particles lose their «correct» spherical shape and Ni particles become much bigger. It also leads to the collapse of catalyst’s texture. XPS data show correlation between NiNiMoS/Mo4+ and rate constant of HDS reactions. According to residual S content, the highest HDS volume activity was observed for the catalyst with Ni/Mo molar ratio of 1/1 at both process temperatures. The values of residual N content correlate well with residual S content in hydrotreating products.

Cite: Nadeina K.A. , Vatutina Y.V. , Mukhacheva P.P. , Budukva S.V. , Panafidin M.A. , Danilova I.G. , Pakharukova V.P. , Gerasimov E.Y. , Krestyaninova V.S. , Klimov O.V. , Noskov A.S.
New Insights into the Formation of Bulk NiMo Hydrotreating Catalysts: Influence of the Ni/Mo Molar Ratio
Fuel. 2025. V.390. 134750 . DOI: 10.1016/j.fuel.2025.134750 WOS Scopus AN OpenAlex publication_identifier_short.sciact_skif_identifier_type

Dates:

Submitted:	Dec 24, 2024
Accepted:	Feb 14, 2025
Published online:	Feb 15, 2025
Published print:	Jun 15, 2025

Identifiers:

Web of science:	WOS:001430936800001
Scopus:	2-s2.0-85217974309
Chemical Abstracts:	2025:427800
OpenAlex:	W4407768993
publication_identifier.sciact_skif_identifier_type:	3709

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