Abstract
In this work, the composition, structural and morphological features, and particle size of the active phase of the catalyst (MoS2), synthesized in-situ during the heavy oil hydroconversion performed in continuous flow reactor on lab-scale pilot flow unit at T = 450 °C, P = 6.0–9.0 MPa, V = 1.0 h−1, H2/feed = 1000 nL/L, catalyst concentration C (Mo) = 0.01–0.08%wt have been studied. It has been shown that MoS2 formed during hydroconversion is represented by nanosized particles stabilized by polycondensation products as a result of strong adsorption and aggregation with the components of the hydroconversion reaction medium. The influence of morphological characteristics of catalyst nanoparticles on the feed conversion, the yield of gaseous and liquid products, and the quality of distillate fractions, as well as the yield of polycondensation products, have been studied. It has been established that an increase in MoS2 active site dispersion, both due to a decreased plate length and lower stacking numbers in MoS2 cluster, enhances hydroconversion effectivity, particularly, in suppressing polycondensation reactions.
Highlights
Development and introduction of novel resource-saving technologies is the main trend of the oil refining industry in economically developed countries
According to previous research [14], it was established that the size and morphology of a molybdenum-containing catalyst formed in-situ in a continuous flow reactor in hydroconversion process depend both on the impact of polycondensation reactions, i.e., yield of coke, and on the content of converted feed, i.e., conversion
Bituminous oil hydroconversion in the presence of in-situ formed dispersed Mo catalyst was investigated to explore the effects of catalyst concentration and pressure on hydroconversion at T = 450 ◦C, P = 6.0–9.0 MPa, V = 1.0 h−1, hydrogen/feed ratio (H2/feed) = 1000 nL/L, and C(Mo) = 0.01–0.08%wt in continuous flow reactor on lab-scale pilot flow unit in oncethrough mode
Summary
Development and introduction of novel resource-saving technologies is the main trend of the oil refining industry in economically developed countries. The increasing proportion of heavy oil in overall extracted raw materials and the need for deeper oil refining to at least 95% are the main factors indicating the importance of research and development of new selective methods for heavy oil processing to produce distillate fractions. These processes should be based on breaking C–C, C–S, C–N bonds in high molecular oil components and hydrogenation of the resulting radical fragments, providing selective conversion of heavy raw materials with the formation of less branched hydrocarbons with a higher hydrogen/carbon ratio [1]. The nature and characteristics of the catalyst are among the most important tools for achieving high performance indicators for heavy oil conversion in thermal processes involving hydrogen [1,3,4,5]
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