High-Temperature Reaction Mechanism of Molybdenum Metal in Direct Coal Liquefaction Residue

Abstract

In this paper, the extraction residue of direct coal liquefaction residue-DCLR(ER) was used as raw material. The high-temperature reaction mechanism of Mo compound in DCLR(ER) was investigated using a synchronous thermal analyzer and the Factsage database. The high temperature reaction of DCLR(ER)-MoO3 in an oxygen atmosphere consists of pyrolysis of organic components at 400–600 °C, molybdenum trioxide sublimation at 747–1200 °C, and a stable stage at 600–747 °C. The thermal reaction process of the DCLR(ER)-MoS2 system in the oxygen atmosphere involves the pyrolysis of unreacted coal and asphaltene, the oxidation of molybdenum sulfide at 349–606/666 °C, the diffusion of MoO3 at 606/666–85 °C, and the sublimation reaction process of MoO3 at 854–1200 °C. The results show that the lower heating rate can promote the oxidation of the Mo compound and the sublimation of molybdenum trioxide. On the other hand, the oxides of aluminum, calcium, and iron in DCLR(ER) can inhibit the oxidative pyrolysis efficiency of the DCLR(ER)-MoS2 system.

Optimized Solid-State Synthesis of Sr2Fe1.5Mo0.5O6−δ Perovskite: Implications for Efficient Synthesis of Mo-Containing SOFC Electrodes

“…To verify our conjecture, the thermal analyses of the Fe2O3-MoO3 mixtures with different ratios were conducted as shown in Figure 2c,d. It can be seen that the final re- A previous study reported that Fe 2 O 3 can react with MoO 3 at 710 • C to form Fe 2 Mo 3 O 12 [30], suggesting that Fe 2 O 3 can stabilize the MoO 3 during high-temperature sintering. To verify our conjecture, the thermal analyses of the Fe 2 O 3 -MoO 3 mixtures with different ratios were conducted as shown in Figure 2c,d.…”

“…This indicates that it is of great importance to prevent the evaporation of MoO 3 during the synthesis of SFMO. A previous study reported that Fe2O3 can react with MoO3 at 710 °C to form Fe2Mo3O12 [30], suggesting that Fe2O3 can stabilize the MoO3 during high-temperature sintering. To verify our conjecture, the thermal analyses of the Fe2O3-MoO3 mixtures with different ratios were conducted as shown in Figure 2c,d.…”

Investigation of chalcopyrite removal from low-grade molybdenite using response surface methodology and its effect on molybdenum trioxide morphology by roasting

“…The oxidation process of MoS 2 can occur inside an electrical furnace in presence of atmospheric oxygen. Molybdenum trioxide, which is converted in two stages as the reaction product between MoS 2 and O 2 , is produced (MoS 2 → MoO 2 → MoO 3 ), according to the reactions (8) and (9): 67,68 MoS 2 + 3O 2 → MoO 2 + 2.5SO 2 MoO 2 + 0.5O 2 → MoO 3 …”