APPLICATION OF DISPERSED MOLYBDENUM-BASED CATALYSTS IN CO- HYDROPROCESSING OF COAL MACERALS AND FCC SLURRY

Abstract

Abstract: n-Octyltrimethylammonium thiomolybdates (OT-MS) was synthesized by the reaction of n-octyltrimethylammonium chloride with ammonium tetrathiomolybdate (MS). The specific surface area of MoS2 catalyst formed by the OT-MS precursor was high, the slab length of the MoS2 crystallites was concentrated in 3-6 nm, and the stacking number was mainly 1-3 layers. The characteristics of co-hydroprocessing reaction of coal macerals with fluid catalytic cracking (FCC) slurry were studied by using Liangshuijing raw coal (LSJR), its inertinite-rich fractions (LSJ-I) and vitrinite-rich fractions (LSJ-V),and FCC slurry as feedstock. Compared with MS, the OT-MS sample showed higher catalytic activity in the co-hydroprocessing reaction of LSJR and FCC slurry. The conversion of dry base ash-free coal increased to 77.1%, while the solid residue yield decreased to 8.3%. For the coal/oil co-hydroprocessing system catalyzed by OT-MS, with the increase of vitrinite content in raw coal, the conversion efficiency and liquid yield of the reaction increased obviously, and the content of saturates fraction in liquid product increased gradually, while the resin and asphaltene fractions decreased. When LSJ-V reacted with heavy oil, the coal conversion reached 90.3%, and the yield of solid residue was as low as 3.4%; the asphaltene content in the iquid product was the lowest, and the H/C atomic ratio was the highest.

Key words: coal/oil co-hydroprocessing, coal macerals, MoS2, ammonium tetrathiomolybdate, n-octyltrimethylammonium thiomolybdate, FCC slurry

References

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