A review on the Mo-precursors for catalytic hydroconversion of heavy oil

Synthesis and performance evaluation of hydrocracking catalysts: A review

“…As a summary, we present in Table 2 a list of common catalysts and reaction products in hydrocracking heavy petrochemicals. Detailed discussion on the use of MoS2 as the main catalyst for heavy oil upgrading is presented in the review article recently published [156]. [154] * NA: information not available in the cited reference…”

Catalysis by sulfides: Advanced IR/CO spectroscopy for the identification of the most active sites in hydrodesulfurization reactions

“…Even if the latest generations of hydrotreating catalysts are still essentially based on the classical composition i.e. sulfide Mo(W) promoted by Co(Ni) supported on alumina, a more thoughtful choice of support characteristics, the addition of dopants and, above all, a better control of the sulfidation stage allowed their performances to be greatly improved [1][2][3].…”

Alternative Preparation of Improved NiMo-Alumina Deoxygenation Catalysts

“…Generally, NiMo-based hydrotreating catalysts are prepared from ammonium heptamolybdate and nickel nitrate or oxides (Griboval et al, 1998;Breysse et al, 2008), eventually used with a complexing agent (Hiroshima et al, 1997;Shimizu et al, 1998;Sun et al, 2003;Escobar et al, 2008), e.g., citric acid (Pessimisis, 1984;Kubota et al, 2010;Pashigreva et al, 2010) or EDTA (Sundaramurthy et al, 2005;Lélias et al, 2010;Al-Dalama and Stanislaus, 2011), to improve the properties of the catalyst. Kang et al (2019) recently highlighted reasons such as improvement in MoS 2 active phase dispersion and stability against deactivation in hydroconversion of heavy oil.…”

“…Multiple groups focused on the synthesis using alternative precursors, such as nickel acetylacetonate Gulková, 2016, Singh et al, 2016), molybdenyl acetylacetonate (Sakanishi et al, 2000;Farag, 2002;Kouzu et al, 2004;Kaluža and Gulková, 2016;Kang et al, 2019), or Mo(CO) 6 (Singh et al, 2016) as opposed to classical nickel nitrate and molybdate. Kang et al (2019) only recently reviewed various Mo-based precursors for the synthesis of catalysts for hydroconversion of heavy oil. They compared them with respect to the process important to the formation of the resulting catalyst, such as dispersibility or thermal properties of the precursor and sulfidation degree, particle size and slabs stacking of the final MoS 2 phase.…”