One Question per Day on Synthetic Ammonia (Series 67)

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This post was last edited by penghh1985 on 2016-4-14 at 11:28. 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 sixty-six 176: Industrial solid catalysts are composed of (). A. Positive catalyst and negative catalyst B. Primary catalyst and auxiliary catalyst C. Active component, promoter, and carrier D. Active component, stabilizer, and carrier 177. In ammonia synthesis, increasing the space velocity can improve the （） between the gas and the catalyst. A. Increased contact time leads to a higher ammonia content in the gas exiting the tower. B. Reduced contact time results in a lower ammonia content in the gas exiting the tower. C. Increased contact time results in a lower ammonia content in the gas exiting the tower. D. Reduced contact time leads to a higher ammonia content in the gas exiting the tower. 178. If the shift reaction always proceeds according to the optimal temperature profile, then the reaction rate ( ). A. Maximum B. Minimum C. Larger D. Smaller 179. When testing and adjusting safety valves, the adjustment pressure is generally ( ) times the operating pressure: A. 1.0～1.1; B.; 1.05～1.2; C. 1.05～1.1 D. 1.1～1.2 180. During ammonia synthesis, the venting location should be chosen at ( ) place. A. The content of inert gases is the highest, and the ammonia content is also the highest. B. The content of inert gases is the lowest, and the ammonia content is also the lowest. C. The content of inert gases is the highest, while the ammonia content is the lowest. D. The content of inert gases is the lowest, while the ammonia content is the highest. Answer: CBACC. Scoring criteria: 3 points for participation, 1 point for each correct answer