Catalytic mechanism of sulfide

Curing catalyst, the use of hydrogen gas (H volume fraction greater than or equal to 25 9,5, o volume fraction less than or equal to 0.5) as the carrier gas (such as dry or semi-water gas shift gas), together with the amount of CS , heated by the furnace through the catalyst bed after warming, curing the main chemical reaction is:
CS2 +4 H2-2H2S + CH (1)
△ H: 98 eleven 240.9 kJ / tool
CoO + H2S-CoS + H2O (2)
△ H098 eleven 13.4 kJ / mol
MoO3 + 2H2S + H2 a MoS2 + 3H2O (3)
A H098 eleven 48.2 kJ / mol
Van Doorn and Baker found that []], CS2 to CH4 transition process is not simply according to reaction (1) conducted, CS in H under the action of Jing in the catalytic decomposition of high activity on the surface of atomic carbon (C) and HS:
CS2 + H2 a C + H2S (4)
This high activity of the carbon atoms to restore strong, it can and catalyst in the reaction of cobalt oxide and molybdenum oxide CO and low-cost metal oxides, but also the formation of coke on the surface:
C + 2M oO3-2MoO2 + CO2 (5)
C + 2Co. O-6Co + CO (6)
C - C (coke) (7)
As the temperature increases, HS and low-cost metal oxides of further oxygen-sulfur exchange reaction of sulfide:
K20 + H2S-K2S + H2o (8)
MoO2 + 2H2S-MoS2 +2 H2O (9)
CoO + H2S-CoS + H2O (10)
Carbon atoms react with H CH:
C + H2-CH (11)