One Question per Day on Synthetic Ammonia (Series 52)

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I. Multiple-choice questions (Each question has 4 options, of which only 1 is correct; fill in the correct option in the brackets). Continuing from Series 51: 1. Before starting up, the desulfurization system must be purged with an inert gas until the oxygen content in the system is less than ( ). A、10% B、0.5% C、1.0% D、20% 2、The active component of sulfur-resistant shift catalysts is ( ) A、CoO, MoO3 B、CoO, CoS C、CoS, MoS2 D、CoO, MoS2 3、When iron catalysts are used in ammonia synthesis, they must be reduced to ( ) in order to have catalytic activity. A、α-Fe B、Fe3O4 C、Fe2O3 D、FeO. In the deliming process using tannin, what acts as the oxygen carrier is (). A. Na2CO3 B. NaHS C. Tannin gum D. NaHCO3 5. The purpose of adding sodium potassium tartrate to the desulfurization solution in the ADA method is to (). A. To improve the color of the by-product sulfur B. To prevent the formation of vanadium-oxygen-sulfur precipitates C. To prevent the formation of iron oxide hydroxide precipitates D. To allow the precipitation of elemental sulfur Answer: BCACB Scoring criteria: 3 points for participation, 1 point for each correct answer